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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

For the Fiscal Year Ended May 31, 2004

For The Transition Period From                     To                     .

COMMISSION FILE NUMBER 0-17988

NEOGEN CORPORATION

(Exact name of registrant as specified in its charter)

620 Lesher Place

Lansing, Michigan 48912

(Address of principal executive offices including zip code)

517-372-9200

(Registrant’s telephone number, including area code)

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT: NONE

SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

COMMON STOCK, $0.16 par value per share

(Title of Class)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ¨

Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act). Yes x No ¨

Based on the closing sale price on May 31, 2004, the aggregate market value of the voting stock held by non-affiliates of the registrant was $109,000,000. For these purposes, the registrant considers its Directors and executive officers to be its only affiliates.

The number of shares outstanding of the registrant’s Common Stock was 8,017,000 on July 31, 2004.

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DOCUMENTS INCORPORATED BY REFERENCE

The Registrant’s definitive proxy statement to be prepared pursuant to regulation 14a and filed in connection with solicitation of proxies for its October 14, 2004 annual meeting of shareholders is incorporated by reference into part III of this Form 10-K.

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

Forward-looking statements, within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, are made throughout this Annual Report on Form 10-K, including statements relating to management’s expectations regarding new product introductions; the adequacy of the Company’s sources for certain components, raw materials and finished products; and the Company’s ability to utilize certain inventory. For this purpose, any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements. Without limiting the foregoing, the words “believes,” “anticipates,” “plans,” “expects,” “seeks,” “estimates,” and similar expressions are intended to identify forward-looking statements. There are a number of important factors that could cause Neogen Corporation’s results to differ materially from those indicated by such forward-looking statements, including those detailed under the caption “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Critical Accounting Policies and Estimates” and “- Future Operating Results.”

In addition, any forward-looking statements represent management’s views only as of the day this Annual Report on Form 10-K was first filed with the Securities and Exchange Commission and should not be relied upon as representing management’s views as of any subsequent date. While management may elect to update forward-looking statements at some point in the future, it specifically disclaims any obligation to do so, even if its views change.

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PART I.

Neogen Corporation and subsidiary (Neogen or the Company) develops, manufactures, and markets a diverse line of products dedicated to food and animal safety. The Company’s food safety segment consists primarily of diagnostic test kits and complementary products (e.g., dehydrated culture media) marketed by company sales personnel in the United States, Canada, the United Kingdom and parts of Europe and by distributors elsewhere to food producers and processors to detect dangerous and/or unintended substances in human food and animal feed, such as foodborne pathogens, natural toxins, food allergens, genetic modifications, ruminant by-products, drug residues, pesticide residues and general sanitation concerns. The diagnostic test kits are generally less expensive, easier to use and provide greater accuracy and speed than conventional diagnostic methods. The majority of the tests are disposable, single-use, immunoassay and gene probe products that rely on the Company’s proprietary antibodies and RNA and DNA probes to produce rapid and accurate test results. The Company’s expanding line of food safety products also includes bioluminescence-based diagnostic technology.

Neogen’s animal safety segment is engaged in the development, manufacture and marketing of pharmaceuticals rodenticides, disinfectants, vaccines, veterinary instruments, topicals and diagnostic products for the worldwide animal safety market. The majority of these consumable products are marketed through a network of national and international distributors, as well as a number of large farm supply retail chains in the United States and Canada. The Company’s USDA-licensed facility in Tampa, Fla., produces immunostimulant products for horses and dogs, and its unique equine botulism vaccine. The Company’s line of drug detection products are sold worldwide for the detection of abused and therapeutic drugs in animals and animal products.

Management’s vision is for Neogen to become a world leader in development and marketing of products dedicated to food and animal safety. To meet this vision, a growth strategy consisting of the following elements has been developed: (i) increasing sales of existing products; (ii) introducing new products and product lines; (iii) expanding international sales; and (iv) acquiring businesses and forming strategic alliances. While the elements of the strategy are stated in order of importance over the long term, management understands and believes that strategic acquisitions will provide the best opportunity for more rapid growth in the short term. For that reason, an active acquisition program is maintained and financial and other resources are maintained to capitalize on opportunities as they arise.

Neogen Corporation was formed as a Michigan corporation in June 1981 and actual operations began in 1982. The Company’s principal executive offices are located at 620 Lesher Place, Lansing, Michigan 48912-1595 and its telephone number is (517) 372-9200.

Neogen’s Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and amendments to those reports are available free of charge via our Internet website (www.neogen.com) as soon as reasonably practicable after such information is filed with, or furnished to, the United States Securities and Exchange Commission.

Trademarks and registered trademarks Neogen markets its products under include: Corporate: Neogen^®, Neogen flask^®; Food Safety: AccuScan^™, AccuPoint^®, Acumedia^® and logo^®, Agri-Scan^®, Agri-Screen^®, Agri-Screen Ticket^®, Alert^®, GeneQuence^™, Gene-Trak^®, ISO-GRID^™, Reveal^®, Revive^®, Veratox^®; Animal Safety: AluShield^™, AmVet^®, BottomHoof^™, BotVax^®, Calf Eze^™, D3 Needles^™, DC&R^®, Dr. Frank’s^®, ElectroJac^®, ELISA Technologies^®, EqStim^®, EquiMax^™, Fura-Zone^®, Gnat-Away^™, GNatural^™, Gold Nugget^® and logo^®, Gold Wrap^™,Havoc^®, Ideal^®, ImmunoRegulin^®, ImmunoVet^®, Injecto-Stik^™, Insight^®, Iso-Prine^™, K-Blue^®, K-Gold^®, MegaShot^™, Mini-Shot^®, MycAseptic^®, NFZ^™, NeedleGard^®, Paddock & Pasture^®, PanaKare^™, Poridon^®, Pro-Pistol^™, Pro-Shot^™, Prozap^®, Pyril-Pam^®, Ramik^®, RenaKare^™, Shine N’ Glo^™, Spec-Tuss^™, Squire^®, Stam-N-Aid^™, Stress-Dex^®, TCA Paint^™, ThrushCrusher^™, TopHoof^™, Tri-Hist^®, Tri-Seal^™, Triple Block^™, Triple Cast^™, Triple Crown^™ and Logo^®, Triple Heat^™, Tri-Soxsuprine^™, UriKare^™, Vita-15^™.

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PRODUCTS

Neogen operates in two primary business areas: products for the detection of pathogens, natural toxins and other unwanted substances in food and feed products, the Food Safety segment, and products dedicated to animal health, the Animal Safety segment. See Notes to Consolidated Financial Statements elsewhere in this form 10-K for financial information about the Company’s business segments and international operations.

FOOD SAFETY SEGMENT

The products of Neogen’s food safety segment consist primarily of diagnostic test kits and complementary products marketed to food and feed producers and processors to detect dangerous and/or unintended substances in food and animal feed, such as foodborne pathogens, natural toxins, food allergens, genetic modifications, ruminant by-products, drug residues, pesticide residues and general sanitation concerns.

Most of the Neogen’s food safety test kits use immunoassay technology to rapidly detect target substances. The Company’s ability to produce superior antibodies, the most sensitive and specific available, sets its products apart from immunoassay test kits produced and sold by other companies. The Company’s test kits are available in microwell formats, which allow for the rapid processing of a large number of samples and automated procedures, and lateral flow and other similar devices that provide distinct visual results. Each test kit uses antibody-coated test devices and chemical reagents to produce a color change to indicate a positive or negative result for the presence of a target substance in a test sample. The simplicity of the tests, similar in technology to home pregnancy tests, make them accessible to all levels of food producers, processors and handlers with minimal equipment and training.

Neogen’s test kits are used to detect potential hazards in food and animal feed by testers ranging from small local grain elevators to the largest, best-known food and feed processors in the world, and numerous regulatory agencies. Every year since 1994, the USDA’s Federal Grain Inspection Service has awarded the Company a contract for the exclusive use of its quantitative test for aflatoxin (a toxic mold by-product) in grain commodities. Similarly, the USDA’s Food Safety Inspection Service has renewed its contract every year since 1994 to use the Company’s rapid test for E. coli O157:H7 to assist in screening the nation’s beef supply for the deadly bacterium.

Meat and poultry processors, seafood processors, fruit and vegetable producers and many other market segments are the primary users of the Neogen’s Reveal^® and Alert^® tests for foodborne bacteria, including E. coli O157:H7, Salmonella, Listeria and Campylobacter. Grain producers and processors of all types and sizes use the Company’s Veratox^® and Agri-Screen^® tests for mycotoxins, including aflatoxin, deoxynivalenol, fumonisin, ochratoxin, zearalenone and T-2 toxin, to help ensure product safety and quality. The world’s largest producers of cookies, crackers, candy, ice cream, and many other foods, use the Company’s market-best Veratox^® and Alert^® testing products for food allergens to protect their food-allergenic customers from the inadvertent contamination of products with food allergens, such as peanut, milk, egg and almond residues.

Neogen developed the first rapid immunoassay test kits to detect ruminant by-products in animal feed ingredients and finished feed. The Agri-Screen^® tests were designed to help prevent ruminants (cattle, sheep and goats) from being fed rendered materials containing ruminant by-products in an effort to prevent the spread of BSE (a.k.a., “mad cow” disease) from animal to animal. The Company’s specialty products for the seafood market include tests for histamine, a highly allergenic substance that occurs when certain species of fish begin to decay; chloramphenicol, a banned antibiotic in most of the world, but still used by some shrimp farmers to improve the yield of their product; and sulfites, an effective but potentially allergenic shrimp preservative.

Neogen also offers other test methods and products to complement its immunoassay tests. The Company’s line of Gene-Trak^® and GeneQuence^™ assays utilize DNA probe hybridization technology to create exceptionally sensitive and specific tests to detect foodborne bacteria. Instead of using antibodies as in an immunoassay to “capture” a target pathogen that may be present in a sample, this technology uses a portion of the target pathogen’s unique ribosomal RNA (rRNA) sequence to bind to complementary rRNA strands of the pathogen in a sample. The result is a test with the ease and speed of a rapid test method, but the specificity of a

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time- consuming conventional laboratory method (specificity is a test’s ability to distinguish between a target pathogen, and a closely-related but innocuous bacterium).

Neogen’s Acumedia^® subsidiary offers dehydrated culture media for varied purposes, including traditional bacterial testing, and growing beneficial bacteria, such as cultures for sausages and beer. The Company’s customers for dehydrated culture media also include commercial and research laboratories and producers of pharmaceuticals, cosmetics and veterinary vaccines.

Neogen manufactures and markets a rapid sanitation test for adenosine triphosphate (ATP), a chemical found in all living cells. This easy to use and relatively inexpensive test uses bioluminescence to quickly (in less than 10 seconds) determine if a food contact surface has been sanitized completely prior to reuse. When ATP comes into contact with the firefly reagent luciferin luciferase contained in the test device, a reaction takes place that produces light. The more light, the more present ATP and the greater the need for more thorough sanitation. The Company’s wide-ranging customer base for its ATP sanitation testing products in the United States and on a worldwide basis beginning in 2004; includes food and beverage processors and the foodservice industry as well as many other users.

Revenues from Neogen’s Food Safety Division accounted for 49.7%, 55.5%, and 49.9% of the Company’s total revenues for fiscal years ended May 31, 2004, 2003 and 2002, respectively.

ANIMAL SAFETY SEGMENT

Neogen’s animal safety segment is primarily engaged in the development, manufacture and marketing of pharmaceuticals, rodenticides, disinfectants, vaccines, veterinary instruments, topicals and diagnostic products to the worldwide animal safety market.

Neogen’s AmVet^® product line provides innovative, value-added, high quality products to the veterinary market. Top AmVet products include PanaKare^™, a digestive aid that serves as a replacement therapy where digestion of protein, carbohydrate and fat is inadequate due to exocrine pancreatic insufficiency; Natural Vitamin E-AD, which aids in the prevention and treatment of vitamin deficiencies in swine, cattle and sheep; and RenaKare^™, a supplement for potassium deficiency in cats and dogs. The Company’s Triple Crown^™ line has been synonymous with quality equine veterinary care since 1971. Products sold under the Triple Crown brand include Vita-15^™ and Liver 7, which are used in the treatment and prevention of nutritional deficiencies in horses.

On November 21, 2003, Neogen acquired Hacco, Inc., a manufacturer of rodenticides, including the brands, Ramik^®, Havoc^® and Prozap^®. On the same date, it also acquired Hess & Clark, Inc. Hess & Clark’s principal products are disinfectants, such as DC&R^®, used in animal and food production facilities and proprietary anti- bacterials for animals.

Neogen’s in-house equine protozoal myeloencephalitis (EPM) testing service offers veterinarians accurate, timely results for early diagnosis of the disease that can devastate a horse’s central nervous system. In addition, the Company’s BotVax^® B vaccine has successfully protected hundreds of thousands of horses and foals against type B botulism, commonly known as Shaker Foal Syndrome. The Company’s product is the only USDA-approved vaccine for the prevention of Type B botulism in horses.

Years of research and many thousands of doses have proven Neogen’s EqStim^® immunostimulant to be safe and effective as a veterinarian-administered adjunct to conventional treatment of equine bacterial and viral respiratory infections. The Company’s ImmunoRegulin^® product uses similar immunostimulant technology to aid in the treatment of pyoderma (a bacterial skin inflammation) in dogs.

Neogen markets a complete line of veterinary instruments and animal health delivery systems under the Ideal product brand name. Approximately 250 different products are offered, many of which are used to deliver animal health products, such as antibiotics and vaccines. Ideal’s D3 Needles^™ are three times stronger than

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conventional veterinary needles, and are uniquely detectable by common meat processing facility metal detectors—a big market advantage in the safety-conscious beef and swine industries.

Animal safety products offered by Neogen to the retail over-the-counter market include many of the Ideal brand veterinary instruments and products sold under the Squire^® and Gold Nugget^® brands. Squire products include Stress-Dex^®, the No. 1 oral electrolyte for performance horses for more than 30 years, and Fura-Zone, for the prevention and treatment of surface bacterial infections in wounds, burns and cutaneous ulcers. Gold Nugget OTC products include GNatural^™ Spray, to protect horses from biting insects, and Poridon^®, a pour-on insecticide for horses.

Neogen’s line of 80 drug detection immunoassay test kits are sold worldwide for the detection of approximately 200 abused and therapeutic drugs in racing animals, such as horses, greyhounds and camels, as well as for testing fair animals and drug residues in meat and meat products. The test kits are also used for human forensic toxicology drug screening applications. This line includes tests for narcotics, analgesics, stimulants, depressants, tranquilizers, anesthetics, steroids and diuretics.

Neogen also has several products used by researchers for the detection of biologically-active substances. These products include tests for cyclic nucleotides, hormones, leukotrienes, prostaglandins and steroids. Marketed under the trademarks of K-Blue and K-Gold, Neogen offers certain test kit components it uses in its own testing products to other diagnostic test kit manufacturers.

Revenues from Neogen’s Animal Safety Division accounted for 50.3%, 44.5%, and 50.1% of the Company’s total revenues for fiscal years ended May 31, 2004, 2003 and 2002 respectively.

GENERAL SALES AND MARKETING

Neogen’s domestic sales efforts are organized by market segments, rather than by products or geography. During the fiscal year that ended May 31, 2004, the Company had more than 5,000 customers for its products. Since many customers for animal safety products are distributors, and certain animal safety products are offered to the general retail market, the total number of end users of the Company’s products is considerably greater than 5,000. A total of 93 employees are assigned to sales and marketing functions within the Company. No single distributor or customer accounted for 10% or more of the Company’s revenues in any of the past three years.

FOOD SAFETY SALES AND MARKETING

To reach each customer and prospect with expertise and experience, Neogen has a staff of specialized food safety sales representatives assigned to specific markets. This staff sells Company products directly to end users, and also handles many technical support issues that arise with customers.

Neogen’s food safety markets are comprised of: feed and agriculture, including grain elevators, feed mills, pet food manufacturers, grain inspection companies and the USDA’s Grain Inspection, Packers and Stockyards Administration (GIPSA); meat and poultry, including meat and poultry processors, producers of ready-to-eat meat and poultry products, and the USDA’s Food Safety Inspection Service (FSIS); milling and grocery, including flour millers, malters, bakeries, candy and confection manufacturers, manufacturers of prepared meals, nuts, spices, cookies, crackers and other snack foods; fruits and vegetables, including growers and processors of juice and packaged fresh cut grocery items; seafood, including harvesters and processors of a wide variety of seafood products; dairy and beverage, including milk processors and soft drink bottlers; and Acumedia dehydrated culture media, including commercial and research laboratories and producers of pharmaceuticals, cosmetics and veterinary vaccines.

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ANIMAL SAFETY SALES AND MARKETING

Neogen markets a broad range of pharmaceuticals, vitamin injectibles, wound care products, topicals, instruments, testing services and a vaccine to the veterinary market. The product range is focused on the food (cattle and pigs) and companion (horses, dogs, and cats) animal markets. Neogen’s sales group works directly with key horse veterinarians, clinics and universities while supporting the efforts of over 500 domestic distributor sales representatives calling on 35,000 plus veterinarians. Neogen supports its veterinary distribution channel through product training, field support, promotions and technical service.

The over-the-counter (OTC) animal health market is larger than the veterinary market and offers significant growth opportunities for Neogen and its products. Neogen again offers a broad range of animal health products including well recognized brands of rodenticides, disinfectants, instruments, electrolytes and horse care products. To reach the OTC market, Neogen’s sales team works with a large network of animal health distributors including marketing groups, like Durvet, Universal Cooperative and AgriLabs, traditional two-step distributors, catalogers and large retail chains. Some of the retail chains include Tractor Supply Company (TSCO:Nasdaq), PETsMART (PETM:Nasdaq) and Orscheln’s Farm & Home. Support includes product training, field support, planogram solutions, promotions and advertising.

INTERNATIONAL SALES AND MARKETING

FOOD SAFETY:

Internationally, Neogen uses its own sales managers to work closely with and coordinate the efforts of a network of more than 100 distributors in 65 countries. The distributors provide local training and technical support, perform market research, and promote Company products around the world.

Neogen’s March 2003 acquisition of Adgen Ltd., (now Neogen Europe, Ltd.), provides the Company better access to the European Union, and allows it to better serve its network of customers and distributors throughout the EU. Prior to the acquisition, Adgen was a major distributor of Neogen products in Europe, and a producer and marketer of its own agricultural diagnostic testing products. Adding Adgen’s experienced research and development team continues to be a strong asset in the development of products tailored to meet unique requirements of the European market.

Since 2002, Neogen has continued to maintain a presence in Shanghai, China, to better serve the expanding food safety market, as well as more closely manage its Chinese animal safety manufacturing. Neogen intends to use local distributors to introduce the Company’s products in the Chinese market.

ANIMAL SAFETY:

The Animal Safety’s international sales group has established a strong presence in several key markets with rodenticides, disinfectants, instruments and veterinary products. Primary utilizing in-country distributors and US-based exporters, these markets include Mexico, Canada, Australia, EU, South America, and the Caribbean. Diagnostic products are sold around the world through an extensive distributor network.

GENERAL:

Revenues from Neogen’s international sales have accounted for 25%, 20%, and 21% of the Company’s total revenues for fiscal years ended May 31, 2004, 2003 and 2002, respectively.

Risks associated with foreign operations include the need for additional regulatory approvals, possible disruptions of product delivery, the differing product needs of foreign customers, difficulties in building and managing foreign operations, fluctuations in the value of foreign currencies, import/export duties and quotas, and unexpected regulatory, economic or political changes in foreign markets. The level of foreign activities does not currently require hedging to reduce the effect of currency fluctuations.

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RESEARCH AND DEVELOPMENT

Management maintains a strong commitment to Neogen’s research and development activities. The Company’s product development efforts are focused on the enhancement of existing product lines and in development of new products that fit its business strategy. The Company employs 28 individuals, in its research and development department, including immunologists, chemists, engineers and microbiologists. Research and development expenditures were approximately $2.9 million, $2.9 million and $2.3 million, representing 5%, 6% and 5%, of total revenues in fiscal 2004, 2003 and 2002, respectively. Management currently intends to maintain the Company’s research and development expenditures at approximately 5% to 6% of total revenues.

Neogen has ongoing development projects for new immunoassay diagnostic tests for the food safety, animal safety and pharmacologics markets, as well as engineering projects for new and improved veterinary instruments. Management expects that these products will be available for marketing in fiscal years 2005 to 2007.

Portions of certain technologies utilized in some products marketed by Neogen were acquired from or developed in collaboration with affiliated partnerships, independent scientists, governmental units, universities and other third parties. The Company has entered into agreements with these parties that provide for the payment of royalties based upon sales of products that utilize the pertinent technology. For fiscal 2004, 2003 and 2002, royalty expense under these agreements amounted to $900,000, $1,524,000 and $1,215,000, respectively.

PROPRIETARY PROTECTION AND APPROVALS

Patents and trademarks are applied for whenever appropriate. Since its inception, Neogen has acquired and received more than 50 patents and trademarks, and has several pending patents and trademarks. The patents expire at various times over the next 20 years.

Management believes that Neogen has adequate protection as to proprietary rights for its products. However, it is aware that substantial research has taken place at universities, governmental agencies and other companies throughout the world and that numerous patent applications have been filed and that numerous patents have been issued. To the extent some of the Company’s products may now, or in the future, embody technologies protected by patents, copyrights or trade secrets of others, licenses to use such technologies may need to be obtained in order to continue to sell the products. These licenses may not be available on commercially reasonable terms. Failure to obtain any such licenses may delay or prevent the sale of certain new or existing products. In addition, patent litigation is not uncommon. Accordingly, there can be no assurance that the Company’s existing patents will be sufficient to completely protect its proprietary rights.

Neogen uses trade secrets as proprietary protection in numerous of its food and animal safety products. In many cases, the Company has developed unique antibodies capable of detecting microorganisms and residues at minute levels. The supply of these antibodies, and the proprietary techniques utilized for their development, may offer better protection than the filing of patents. Such proprietary reagents are maintained in secure facilities and stored in more than one location to reduce exposure to complete destruction by natural disaster or other means.

One of the major areas affecting the success of biotechnology development involves the time, costs and uncertainty surrounding regulatory approvals. Currently, Neogen products requiring regulatory approval include BotVax B, EqStim and ImmunoRegulin. The Company’s general strategy is to select technical and proprietary products that do not require mandatory approval to be marketed. In China nine of the Company’s immunoassay based test kits are listed in the GB, or National Standard. Listings of these products are expected assist to generate future sales into Government and other laboratories in China.

Neogen utilizes third party validations on many of its disposable test kits as a marketing tool to provide its customers with the proper assurances. These include validation by the Association of Official Analytical Chemists, independently administered third-party, multi-laboratory collaborative studies and approvals by the U.S. Federal Grain Inspection Service and the U.S. Food Safety Inspection Service for the use of Company products in their operations.

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PRODUCTION AND SUPPLY

Neogen manufactures its products in Lansing, Michigan; Lexington, Kentucky; Randolph, Wisconsin; Baltimore, Maryland; Tampa, Florida; and Ayr, Scotland. There are currently approximately 150 full-time employees assigned to manufacturing in these six locations. All locations generally operate on a one-shift basis, but could be increased to a two-shift basis. Management believes it could increase the current output of its primary product lines by more than 50% using the current space available with a minimum of additional capital equipment.

Manufacturing of diagnostic tests for detection of natural toxins, pathogens, food allergen and pesticides, final kit assembly, quality assurance and shipping takes place from the Company’s facility in Lansing, Michigan. Proprietary monoclonal and polyclonal antibodies for the Neogen’s diagnostic kits are produced on a regular schedule in the Company’s immunology laboratories. Other reagents are similarly prepared by the chemistry group.

Manufacture of pharmacological diagnostic test kits, test kits for drug residues and of animal health products takes place from the Company’s facility in Lexington, Kentucky. In general, manufacturing operations including reagent manufacturing, quality assurance, final kit assembly and packaging are performed by Neogen personnel. Certain animal health products that are purchased finished or that are toll manufactured by third party vendors and veterinary instruments are warehoused and shipped from the Company’s Lexington facility.

Manufacture of rodenticides and disinfectants takes place in Randolph, Wisconsin. Manufacturing consists of blending technical material (active ingredient) with bait consisting principally of various grains. Final manufacture, packing and shipment are all performed by Neogen personnel.

The Baltimore, Maryland, facility is a FDA-approved manufacturing plant devoted to the production of dehydrated culture media products. Products are blended following strict formulations or custom blended to customer specification and shipped directly to customers from the Baltimore facility or from warehoused product in Lansing, Michigan.

The Tampa, Florida, facility is an USDA-approved manufacturing plant devoted to the production of the biologic products EqStim^® and ImmunoRegulin^®. P.acnes seed cultures are added to media and then subjected to several stages of further processing resulting in a product that is filled and packaged within the Tampa facility. The Company’s BoxVax B vaccine is also produced in the Tampa facility, utilizing Type B botulism seed cultures and a traditional fermentation process. All completed product is then shipped to Neogen’s Lexington facilities for inventory and distribution to customers.

Neogen purchases component parts and raw materials from more than 200 suppliers. Though many of these supplies are purchased from a single source in order to achieve the greatest volume discounts, the Company believes it has identified acceptable alternative suppliers for all of its components and raw materials.

Shipments of products are generally accomplished within a 48-hour turnaround time. As a result of this quick response time, Neogen’s backlog of unshipped orders at any given time is not significant.

COMPETITION

Although competitors vary in individual markets, management knows of no competitor that is pursuing the Neogen’s fundamental strategy of developing a full line of products, ranging from disposable tests and dehydrated culture media to veterinary pharmaceuticals and veterinary instruments for a large number of food safety and animal safety concerns. For each of its individual products, the Company faces intense competition from companies ranging from small businesses to divisions of large international companies. Some of these organizations have substantially greater financial resources than the Company. The Company competes primarily on the basis of ease of use, speed, accuracy, and other similar performance characteristics of its products. The breadth of the Company’s product line, the effectiveness of its sales and customer service organizations and

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pricing are also components in management’s competitive plan. Management is not aware of any factors within its product lines that place the Company in a negative competitive position relative to its competitors.

Future competition may become even more intense, including the development of changing technologies, which could affect the marketability of the Neogen’s products. The Company’s competitive position also will depend on management’s ability to develop proprietary products, attract and retain qualified scientific and other personnel, develop and implement production and marketing plans and obtain patent protection and adequate capital resources.

FOOD SAFETY

Neogen’s Food Safety Division has strong distribution of its products using Company employees domestically and from an active and aggressive distributor group outside of North America. With one of the largest professional sales organizations in the industry, management believes that it maintains a general competitive advantage as sales personnel are in a position to be with customers and prospects more frequently than those of its competitors. Additionally, as an agriculturally based company, Neogen has what is believed to be a unique insight into the food industry as opposed to its clinically based competition.

Competition for pathogen detection products includes traditional methods and antibody and genetic based platforms. Neogen’s product offerings compete across the entire spectrum of methods. Competition for natural toxins and allergen detection products include instrumentation and antibody based tests. Generally, the Company’s products fall within the non-instrument category. While for these and other food safety products the Company’s offerings will not always compete on all platforms in all markets, the products that are offered provide tests that can be well utilized by most customers to meet their testing needs.

Besides its strong product offerings and its superior distribution, the Company focuses its competitive advantage in the areas of customer service and speed and ease of use of its products. Additionally, by aggressively maintaining itself as a low cost producer, Neogen assures that it can be competitive with new market entrants that may choose a low pricing strategy in an attempt to gain market share.

ANIMAL SAFETY

Neogen’s Animal Safety Division faces no one competitor across the products and markets it serves. In the racing industry market, the Company holds the position of dominant market share, facing only one other significant company in the marketplace. In the Life Sciences market, the Company competes against a few other diagnostic and reagent companies but none with the same breadth of product offering.

In the veterinary market, Neogen markets BotVax B, the only USDA approved vaccine for the prevention of botulism Type B in horses. The Company competes on other key products through differentiated product performance and superior customer and technical support. With some of its products, the Company provides a generic drug solution as a lower cost alternative and offers a private label option for its distributors.

Competition in the rodenticide market includes several companies of comparable size that offer products into similar market segments. The rodenticide retail market is dominated by a single brand. While the technical materials used by the competing companies are similar, Neogen uses techniques to better draw rodents to the product and thereby improve the objectives of the product.

Neogen competes in the retail market by providing solutions to common retail problems – stock outs, wasted floor space, and inconsistent brand identity. The Company offers plan-o-grams and reordering systems to maximize turns and profitability for its customers.

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GOVERNMENT REGULATION

A significant portion of the Neogen’s products and revenues are affected by the regulations of various domestic and foreign government agencies, including the U.S. Department of Agriculture and the U.S. Food and Drug Administration. Changes in these regulations could affect revenues and/or costs or production and distribution.

Neogen’s development and manufacturing processes involve the use of certain hazardous material, chemicals and compounds. Management believes that the Company’s safety features for handling and disposing of such commodities comply with the standards prescribed by local, state and federal regulations. The Company’s cost to comply with these regulations is not significant and the Company has no reason to believe that any such future legislation or rules would be materially adverse to its business.

The Company’s rodenticide products generally require registration with U.S. governmental agencies at federal and state levels and with foreign governments.

EMPLOYEES

Currently, the Company employs 337 full-time persons. None of the employees are covered by collective bargaining agreements. There have been no work stoppages or slow downs due to labor-related problems. Management believes that its relationship with its employees is good. All employees having access to proprietary information have executed confidentially agreements with the Company.

Neogen owns eight separate buildings located in Lansing, Michigan. A 26,000 square foot building located at 620 Lesher Place includes senior corporate administrative offices, food safety sales and marketing offices and research facilities. A 12,000 square foot building located at 600 Lesher Place is used for corporate accounting, human resources, and communications functions. Two adjacent buildings, located nearby at 703 and 720 Shiawassee, total 25,000 square feet and are used for manufacture of food safety products. Remaining buildings in Lansing, principally a building at 501 N. Hosmer with a combined total of 46,000 square feet, are used for manufacturing of veterinary instruments and held for pending future expansion.

Animal Safety sales and marketing, diagnostic test kit manufacturing and distribution of all other Animal Safety products takes place from an 80,000 square foot Company owned facility at 944 Nandino Drive in Lexington, Kentucky.

Animal Safety pharmaceutical, supplement and topical product manufacturing takes place in 16,000 square feet of leased space at 2040 Creative Drive in Lexington, Kentucky. The lease covering the space is a non-cancelable operating lease through December 31, 2007 currently requiring monthly payments of $6,059.

Dehydrated culture media manufacturing takes place in a FDA licensed facility. The operations are located in 14,400 square feet of leased space at 9601 Pulaski Park Drive, Baltimore, Maryland. The lease, which expires November 30, 2004, provides for monthly payments of $7,980. Upon expiration of the lease on this facility, management believes it negotiate a new lease on the existing facility or relocate to a comparable facility with materially similar costs.

The Company leases 5,200 square feet at 5910 Breckenridge Center Parkway in Tampa, Florida where the manufacturing of three animal safety products takes place. This USDA-approved facility is subject to a non-cancelable lease through September 2004. The current rental rate is $5,237 monthly. The lease is currently under negotiation for renewal and management expects that renewal at an acceptable rate will be obtained.

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Neogen Europe Ltd. operations take place in 12,948 square feet in the Cunningham Building at Auchincruive Ayrshire Scotland (on the campus of The Scottish Agricultural College at Ayr). The lease agreement on this property expires May 31, 2018, however, Adgen may terminate the lease after 5 years or 10 years from inception with a payment of 6 months or 3 months rent, respectively. The current rental rate is £34,650 annually increasing to £63,000 in year five (all plus value added tax).

Rodenticide and disinfectant manufacturing and warehousing is conducted in 80,000 square feet of Company owned buildings at 110 Hopkins Drive in Randolph, Wisconsin.

These properties are in good condition, well-maintained, and generally suitable and adequate to carry on the Company’s business.

Neogen is subject to certain legal proceedings in the normal course of business that, in the opinion of management, will not have a material effect on its future results of operations or financial position.

No matters were submitted to a vote of security holders during the fourth quarter of the fiscal year covered by this report.

PART II

Neogen Common Stock is traded on the NASDAQ National Market under the symbol “NEOG”. The following table sets for, the fiscal periods indicated, the high and low sales prices for the Common Stock as reported on the NASDAQ National Market.

The stock prices in the above table reflect a stock dividend, having the effect of a 5-for-4 stock split, that was paid on December 31, 2003.

As of July 31, 2004, there were approximately 500 stockholders of record of Common Stock that management believes represents a total of approximately 6,000 beneficial holders. Neogen has never paid any cash dividends on its Common Stock and does not anticipate paying any cash dividends in the foreseeable future.

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The following tables sets forth selected consolidated financial data of Neogen for each of the five years ended May 31, 2004. The selected consolidated financial data presented below have been derived from the Company’s consolidated financial statements. These financial data should be read in conjunction with the consolidated financial statements, related notes and other financial information appearing elsewhere in this Form 10-K.

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The information in this Management’s Discussion and Analysis of Financial Condition and Results of Operations contains both historical financial information and forward-looking statements. Neogen Corporation management does not provide forecasts of future financial performance. While management is optimistic about the Company’s long-term prospects, historical financial information may not be indicative of future financial results.

Any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements. Without limiting the foregoing, the words “believes,” “anticipates,” “plans,” “expects,” “seeks,” “estimates,” and similar expressions are intended to identify forward-looking statements. There are a number of important factors, including competition, recruitment and dependence on key employees, impact of weather on agriculture and food production, identification and integration of acquisitions, research and development risks, patent and trade secret protection, government regulation and other risks detailed from time to time in the Company’s reports on file at the Securities and Exchange Commission, that could cause Neogen Corporation’s results to differ materially from those indicated by such forward-looking statements, including those detailed in this “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

In addition, any forward-looking statements represent management’s views only as of the day this Report on Form 10-K was first filed with the Securities and Exchange Commission and should not be relied upon as representing management’s views as of any subsequent date. While management may elect to update forward-looking statements at some point in the future, it specifically disclaims any obligation to do so, even if its views change.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

The discussion and analysis of the Company’s financial condition and results of operations are based on the consolidated financial statements that have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires that management make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, management evaluates the estimates, including those related to receivable allowances, inventories and intangible assets. These estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different, assumptions or conditions.

The following critical accounting policies reflect management’s more significant judgments and estimates used in the preparation of the consolidated financial statements.

Revenue Recognition

Revenue from sales of products is recognized at the time title of goods passes to the buyer and the buyer assumes the risks and rewards of ownership. This is generally at the time of shipment. Where right of return exists, allowances are made at the time of sale to reflect expected returns based on historical experience.

Accounts Receivable Allowance

Management attempts to minimize credit risk by reviewing customers’ credit history before extending credit and by monitoring credit exposure on a regular basis. An allowance for possible losses on accounts receivable is established based upon factors surrounding the credit risk of specific customers, historical trends and other information, such as changes in overall changes in customer credit and general credit conditions. Actual collections can differ from historical experience, and if economic or business conditions deteriorate significantly, adjustments to these reserves could be required.

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Inventory

Obsolete inventory is written off as it is identified against the reserve. Product obsolescence may be caused by shelf-life expiration, discontinuance of a product line, replacement products in the marketplace or other competitive situations. A reserve for obsolescence is established based on an analysis of the inventory taking into account the current condition of the asset as well as other known facts and future plans. The amount of reserve required to record inventory at lower of cost or market may be adjusted as conditions change.

Valuation of Intangible Assets and Goodwill

Management assesses goodwill and other non-amortizable intangible assets for possible impairment on no less often than an annual basis. This test was performed in the fourth quarter of fiscal 2004 and it was determined that no impairment exists. There was also no impairment indicated for 2003 or 2002. In the event of changes in circumstances that indicate the carrying value of these assets may not be recoverable, management will make an assessment at any time. Factors that could cause an impairment review to take place would include:

When management determines that the carrying value of intangible assets may not be recoverable based on the existence of one or more of the above indicators of impairment, the carrying value is compared to a value determined based on projected discounted cash flows using a discount rate commensurate with the risk inherent in the Company’s current business model. Any impairment identified in this computation is given current recognition in any unissued financial statements. Changes to the discount rate used in the analysis or discounted cash flows can have a significant impact on the results of the impairment test.

RESULTS OF OPERATIONS

Executive Overview

On an overall basis, the 2004 fiscal year had excellent increases in comparison with the fiscal year ended May 31, 2003 primarily as a result of revenue increases in the Animal Safety segment. A portion of the Animal Safety segment’s revenue increases came from the Company’s late November acquisitions of Hacco, Inc. and Hess & Clark, Inc. that were reported as new components of this segment in the current year. Additionally, Animal Safety segment revenue growth from continuing products increased 12% following a year in which the segment experienced little growth. Growth came as a result of economic improvements in certain markets and from implementation of the segment’s sales and marketing plans. Food Safety segment revenues increased 4% with difficult revenue comparisons in the current year following large weather related sales increases in the prior year. The segment had successes during the year in sales of test kits for Listeria, Salmonella, and allergens and increased sales of test kits for genetically modified organisms to South America. While total revenues were up 16%, net income was up 7% principally as a result of changes in product mix on overall gross margins, the effect of reorganization expenses related to the closing of the Chicago manufacturing operation that consolidated the veterinary instruments business to other locations within the Company and integration costs of the Hacco and Hess & Clark acquisitions, all offset by strong control of other costs.

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REVENUES

(dollars in thousands)

Within the Food Safety business segment, sales of natural toxin and allergen test kits decreased 7% in comparison with the prior year. A significant portion of the U.S. grain crop was contaminated with aflatoxin in 2002 and the Company’s products were widely used in the Company’s 2003 fiscal year in the identification of infected commodities and thereby the protection of consumers from exposure to this carcinogen. The 2003 crop was largely uncontaminated. The Company continues to enjoy rapid market acceptance of the allergen products. Sales of diagnostic tests for monitoring bacterial pathogens and general sanitation products were unchanged in 2004. The Company experienced heavier levels of competition during the year and certain customers have decreased frequencies of testing for E.coli. Sales of diagnostic test kits for the detection of Listeria and Salmonella increased by 17% and 6% respectively in comparison with the prior year. These increases were the result of increased market penetration and general acceptance of these product offerings. Other sales increased by 37% principally due to increased penetration into the dehydrated cultured media markets and from increased sales of test kits to South America to detect soybeans that have been genetically modified to make them tolerant to Roundup herbicides.

In the year ended May 31, 2003, Food Safety sales increased 26% in comparison with the year ended May 31, 2002. Each of the Lansing based product groups contributed to the increase with a 17% increase coming from sales of tests to detect bacterial pathogens and general sanitation testing products. Additional increases resulted in a 39% increase coming from sales of products to detect natural toxins and allergen detection products. An outbreak of aflatoxin in the Midwest in 2002 contributed to the sharp increase in sales of natural toxin detection products. Growth in sales of detection products for several other natural toxins was strong as awareness for the need for testing for these toxins had increased. The growth in allergen detection products is fueled by public and producer recognition of this food safety problem. Sales of Acumedia, the Company’s dehydrated culture media manufacturing subsidiary, increased 15% in 2003 with continued penetration into Food Safety markets and the addition of other customers.

Within the Animal Safety business segment, sales of Life Sciences and other related products increased 1% in comparison with the prior year. Life Sciences and other products sales include sales of diagnostic products for detection of drugs of abuse in performance animals and life science products used by customers in research projects. Testing markets for drugs of abuse in performance animals is generally a mature market with revenues steady between the years. Markets for products marketed for use in the research and development of life sciences are cyclical, which accounted for the small growth in the category in 2004 following excellent growth in

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2003. Sales of Neogen’s vaccine for equine botulism increased by 10% for the year due to strong international deliveries. The acquisition of Hacco’s rodenticides and Hess & Clark’s disinfectants in November were a significant addition to the sales of the Animal Safety business segment (see table above). Sales of veterinary instruments were up 28% in comparison with the prior year with significant sales to the chain store retail segment. Other sales consisted primarily of Amvet Pharmaceutical products and Triple Crown products, which increased 12% over the same period in the prior year as the Company continues to penetrate the animal safety market.

Overall sales for the Animal Safety segment in 2003 grew by 1% over the 2002 year. Double digit sales percentage increases were experienced in all Neogen Lexington product lines except for Triple Crown, which decreased by 14%. Sales of Life Sciences and other test kits increased by 17% in 2003 in comparison with the year ended 2002. Sales of Neogen’s equine vaccine increased by 4% in comparison with 2002. Overall veterinary instrument sales were down 22% in the period ended May 31, 2003 when compared with the period ended May 31, 2002. Competition in certain of the products that comprise the Triple Crown line increased dramatically during the year. Sales of Ideal veterinary products decreased 20% for over the counter instruments. This decrease resulted primarily from the prior year being inclusive of a large initial stocking order for Tractor Supply Company’s 413 United States stores and another initial stocking order for Ideal’s detectable D3 needles for the swine industry.

COST OF GOODS SOLD

Cost of goods sold increased by 29% in 2004 and by 8% in 2003 in comparison with the prior year. This compares against a 16% increase in revenues in 2004 and a 13% increase in revenues in 2003. As expressed as a percentage of revenues, cost of goods sold was 50% in 2004, 47% in 2003 and 48% in 2002.

Food Safety gross margins were 57%, 61% and 60% in 2004, 2003 and 2002, respectively. Changes in margins between periods relate primarily to changes in product mix. With relatively higher levels of sales of diagnostic kits related to the aflatoxin outbreak in 2003, Food Safety margins were higher in that year than in either 2002 or 2004. Additionally, in 2004, the Company carried certain additional overhead costs related to the new diagnostic manufacturing facility and the new ATP product introduction late in the year that adversely affected gross margins.

Animal Safety gross margins were 42%, 45% and 44% in 2004, 2003 and 2002, respectively. Changes in margins between periods relate primarily to product mix. In particular, margins on certain products are subject to fluctuations based on market conditions. The Company does not maintain any of the particular products that are subject to price fluctuations in inventory (they are shipped directly to customers from the vendors).

OPERATING EXPENSES

Sales and marketing expense categories remained consistent in 2004 with 2003. As a percentage of sales, sales and marketing expense decreased in 2004 to 22% from 25% in 2003 and 24% in 2002. The reduction of sales and marketing expenses as a percentage of revenues resulted from strong cost containment measures instituted early in the year. Also, during 2004, a royalty agreement expired in which the company was obligated to pay

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royalties to research corporation investors on natural toxin test kit sales. This royalty contributed 1% of the decrease in expenses. Management plans to continue to expand the Company’s sales and marketing efforts both domestically and internationally in the future, but does not expect related expenses to increase materially as a percentage of sales.

General and administrative expenses increased by 21% in 2004 and decreased by 1% in 2003 from the same period in 2002. Significant increases in 2004 resulted primarily from the acquisition of Hacco in November 2003 and Adgen in February of the prior year as well as due to increased levels of operations of the Company. As a percentage of revenue, general and administrative expenses remained at 9% in 2004 in comparison with 9% in 2003 and decreased from 10% in 2002. These expenses tend to remain more fixed as compared to many other Company expenses.

Research and development expenses decreased by 1% in 2004 in comparison with 2003 and had increased in 2003 by 29% in comparison with 2002. As a percentage of revenue these expenses were 5%, 6% and 5% in the years ended May 31, 2004, 2003 and 2002 respectively. Although some fluctuation in research and development expenses will occur, management expects research and development expenses to approximate 5% to 6% of revenues over time. These expenses approximate 8% to 10% of revenues from products and product lines that are supported by research and development. Certain of the Company’s products require relatively less in research and development expenses.

OPERATING INCOME

During fiscal year 2004 and 2003, the Company’s operating income was 14% of revenues as compared to 13% in 2002. The Company was successful in maintaining its operating income despite fluctuations in gross margins by aggressive controls of other expenses.

OTHER INCOME

Other income decreased significantly in 2004 principally as a result of decreased royalties from related limited partnerships that expired in fiscal 2004. The interest income component of other income decreased in 2004 principally as a result of the expenditures of the invested funds on acquisitions.

FEDERAL AND STATE INCOME TAXES

Federal and state income tax rates used in the computation of income tax expense in the periods remained comparable to those in the prior year. Expressed as a percentage of income before tax, such rates were 33.6% in 2004; 34.2% in 2003 and 33.8% in 2002.

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NET INCOME AND NET INCOME PER SHARE

Net income and net income per share in 2004 has been reduced by $300,000 or $.04 per share related to the closing of the Company’s Chicago area plant and the relocation of the operation to Lansing and Lexington.

FUTURE OPERATING RESULTS

Neogen Corporation’s future operating results involve a number of risks and uncertainties. Actual events or results may differ materially from those discussed in this report. Factors that could cause or contribute to such differences include, but are not limited to, the factors discussed below as well as those discussed elsewhere in this report. Management’s ability to grow the business in the future depends upon its ability to successfully implement various strategies, including:

FINANCIAL CONDITION AND LIQUIDITY

On May 31, 2004, the Company had $1,700,000 in cash and marketable securities, working capital of $20,600,000 and stockholders’ equity of $47,800,000. In addition available bank lines of $11,100,000 were available to, if necessary, support ongoing operations or acquisitions.

Cash and marketable securities decreased $7,200,000 during 2004. Cash provided from operations of $2,981,000 was offset by the acquisition of Hacco, Inc. and Hess & Clark, Inc. for $10,000,000, and for the purchase of $5,000,000 of property, equipment and other noncurrent assets.

Accounts receivable increased $2,425,000 or 32% when compared to May 31, 2003. This resulted from increased sales together with increases to support the operations of Hacco and Hess & Clark that were purchased without accounts receivable. Days sales outstanding increased from 56 days at May 31, 2003 to 58 days at May 31, 2004.

Inventory levels increased 10% ($1,000,000) in 2004 (excluding the new Hacco and Hess & Clark business). As compared to 2003, business with existing customers (excluding Hacco and Hess & Clark) increased 8% during the year. The Company maintains sufficient levels of inventory to assure that customer demands can be met on a timely basis.

Purchases of long-lived assets totaled $5,000,000 and resulted from purchases and renovations of new manufacturing facilities in Lexington and Lansing of $3,300,000 and other expenditures during the year.

Net goodwill and non-amortizable intangible assets increased by $5,627,000 in 2004 primarily as a result of the goodwill acquired in the acquisition of Hacco, Inc. and Hess & Clark, Inc. on November 21, 2003.

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The Company renegotiated its bank line in 2004 and borrowed $4,800,000 to partially finance the purchase of Hacco, Inc. and Hess & Clark, Inc. and buildings in Lansing, Michigan and Lexington, Kentucky. At May 31, 2004 the outstanding balance was $3,900,000. At May 31, 2004, the Company had no material commitments for capital expenditures. Inflation and changing prices have not had and are not expected to have a material effect on the Company’s operations.

CONTRACTUAL OBLIGATIONS

The Company has the following contractual obligations due by period:

The Company’s systems do not currently provide for the routine aggregation of outstanding purchase obligations. In general, purchase obligations for raw material and purchased finished goods for inventory are made to meet current and projected demand and provide for delivery over periods of 15 days to six months from the date the orders are placed with vendors. At any point in time, not more than $5,000,000 of obligations for purchases of inventory are believed to be outstanding. Purchases for other than inventory purposes are controlled by an approved expense budget and senior management approval and, in the case of capital assets, are controlled by an approved capital budget.

Neogen has been profitable from operations for its last 45 quarters and has generated positive cash flow from operations during the period. However, the Company’s current funds may not be sufficient to meet the Company’s cash requirements to commercialize products currently under development or its plans to acquire additional technology and products that fit within the Company’s mission statement. Accordingly, the Company may be required to issue equity securities or enter into other financing arrangements for a portion of the Company’s future capital needs.

The Company is subject to certain legal proceedings in the normal course of business that, in the opinion of management, will not have a material effect on its results of operations or financial position.

NEW ACCOUNTING PRONOUNCEMENTS

See discussion of any New Accounting Pronouncements in Note 1 to Consolidated Financial Statements.

The Company has minimal interest rate and foreign exchange rate risk exposure and no fixed rate investments or borrowings. The Company’s primary interest rate risk is due to potential fluctuations of interest rates for variable rate borrowings.

Generally, sales are dominated in U.S. dollars, however, because Neogen markets and sells its products throughout the world, it could be significantly affected by weak economic conditions in foreign markets that could reduce demand for its products.

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Neogen has assets, liabilities and operations outside of the United States that are located primarily in Ayr, Scotland where the function currency is the British Pound. The Company’s investment in its foreign subsidiary is considered long-term. Accordingly, the Company does not hedge its net investment or engage in other foreign currency hedging activities due to the insignificance of these balances to the Company as a whole.

The response to this item is submitted in a separate section of this report.

Independent Registered Public Accounting Firm

On January 16, 2003, Neogen dismissed Deloitte & Touche, LLP (D&T) as its independent registered public accounting firm. The Audit Committee of the Company’s Board of Directors recommended the change of auditors and the change was approved by the Company’s Board of Directors.

The reports of D&T on Neogen’s financial statements for the fiscal years ended May 31, 2002 and 2001 did not contain an adverse opinion or disclaimer of opinion and were not qualified or modified as to uncertainty, audit scope or accounting principles. During the Company’s two most recent fiscal years, and subsequent interim periods through January 16, 2003, there were no disagreements with D&T on any matter of accounting principles or practice financial statement disclosure, or auditing scope or procedures, which disagreements, if not resolved to the satisfaction of D&T, would have caused it to make reference to such disagreements in its reports, nor were there any reportable events as defined in Regulation S-K Item 304(a)(1)(v).

Following review of proposals from several accounting firms, effective January 16, 2003 Neogen engaged Ernst & Young LLP (E&Y) as its independent registered public accounting firm. During the Company’s two most recent fiscal years and subsequent interim periods before engaging E&Y, the Company did not consult E&Y regarding the application of accounting principles to a specific transaction, either completed or proposed, or the type of audit opinion that might be rendered on the Company’s financial statements, or any matter that was either the subject of a disagreement, or of a reportable event as defined in Regulation S-K Item 304(a)(1)(v).

There were no disagreements or reportable events with E&Y following its appointment.

Within the 90-day period preceding the date of this report, an evaluation of the effectiveness of the design and operation of Neogen’s disclosure controls and procedures was carried out under the supervision and with the participation of the Company’s Chief Executive and Chief Financial Officers. Based on that evaluation, the certifying officers concluded that the Company’s disclosure controls and procedures are effective to bring to the attention of the Company’s management the relevant information necessary to permit an assessment of the need to disclose material developments and risks pertaining to the Company’s business in its periodic filings with the Securities and Exchange Commission. There have been no significant changes to the Company’s internal controls or in other factors that could significantly affect these controls subsequent to the date of the evaluation.

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PART III

Information regarding the Company and certain corporate governance matters appearing under the captions “Election of Directors”, “Audit Committee”, and “Miscellaneous-Section 16(a) Beneficial Ownership Reporting Compliance” in the 2004 proxy statement is included herein by reference.

The Company has adopted a Code of Conduct that applies to all of its directors, officers and employees. The Company has made a copy of this Code of Conduct available on its Website at http://www.neogen.com/ pdf/Code_of_Conduct.pdf.

OFFICERS AND OTHER KEY INDIVIDUALS OF THE REGISTRANT

The officers of Neogen are elected by and serve at the discretion of the Board of Directors. The Board of Directors has also named a Scientific Review Council to serve at the pleasure of the Board. The Scientific Review Council meets several times annually to review the research progress of the Company and to recommend or approve new research and product development activities of the Company. The names and occupations of the Company’s officers and other key individuals are set forth below.

There are no family relationships among officers. Information concerning the executive officers of Neogen follows:

Lon M. Bohannon, age 51, joined the Company in October 1985 as Vice President of Finance, was promoted to Chief Financial Officer in June 1987, was promoted to Vice President Administration and Chief Financial Officer in November 1994, was elected to the Board of Directors in October 1996, and was named Chief Operating Officer in September 1999. He is responsible for all Company operations except research, finance, and corporate development. A CPA, he was Administrative Controller for Federal Forge, Inc., a metal forging and stamping firm, from March 1980 until October 1985, and was associated with the public accounting firm of Ernst & Young LLP from June 1975 to March 1980.

Edward L. Bradley, age 44, joined Neogen in February 1995 as Vice President of Sales and Marketing for AMPCOR Diagnostics, Inc. In June 1996, he was made a Vice President of Neogen Corporation. Currently, Mr. Bradley is responsible for all sales and marketing activities focused on food safety products on a worldwide basis. From 1988 to 1995, Mr. Bradley served in several sales and marketing capacities for Mallinckrodt Animal Health, including the position of National Sales Manager responsible for 40 employees in its Food Animal Products Division. Prior to joining Mallinckrodt, he held several sales and marketing positions for Stauffer Chemical Company.

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Richard R. Current, age 60, joined the Company in November 1999 as Vice President and Chief Financial Officer. Prior to joining Neogen, Mr. Current served as Executive Vice President and Chief Financial Officer of Integral Vision, Inc. from 1994 to 1999 and as Vice President and Chief Financial Officer of the Shane Group, Inc., a privately held company from 1991 to 1994. Mr. Current was associated with the public accounting firm of Ernst & Young LLP for 24 years and served as Managing Partner of the Lansing, Michigan office from 1986 to 1991.

James L. Herbert, age 64, has been President, Chief Executive Officer, and a director of the Company since he joined Neogen in June, 1982. From 1999 to 2001 he was Chairman of the Company’s Board. He previously held the position of Corporate Vice President of DeKalb Ag Research, a major agricultural genetics and energy company. He has management experience in animal biologics, specialized chemical research, medical instruments, aquaculture, animal nutrition, and poultry and livestock breeding and production.

Kenneth V. Kodilla, age 47, joined the Company in November 2003 as Vice President of Manufacturing. He has responsibility for all manufacturing, inventory management, shipping and quality system operations for the Company’s Food Safety Division in Lansing, Michigan. Prior to Neogen, Mr. Kodilla served as plant manager for Facet Technologies in Atlanta, Georgia from 2001, as Manufacturing Manager for Becton Dickinson and Difco Laboratories from 1988, and as Quality Manager for Lee Laboratories from 1984. Mr. Kodilla’s manufacturing and regulatory experience includes FDA/ISO regulated Class II and III diagnostic reagents and devices, high volume automated assembly and packaging, materials management and plant operations.

Dr. Joseph M. Madden, age 55, joined Neogen in December 1997 as Vice President of Scientific Affairs after retiring from the Food and Drug Administration as its Microbiology Strategic Manager. He joined the FDA in 1978 and spent his first 10 years as a research microbiologist for the agency. Dr. Madden has served on numerous committees on food safety, including his current appointment to the National Advisory Committee on Microbiological Criteria for Foods. He is regarded by regulatory agencies and the food industry as being one of the nation’s top experts on both scientific and regulatory issues relating to food safety.

Anthony E. Maltese, age 60, joined Neogen on June 1, 1999 as Manager of Corporate Development. He was promoted to Vice President in October, 2000. Prior to joining Neogen, Mr. Maltese served as Vice President of Business Development for Creatogen Biosciences, GmbH of Angsburg, Germany. From 1990 to 1998, he worked in production and special project management positions for REMEL, Inc. including Manager of Business Development. Prior to REMEL, Mr. Maltese spent 20 years at Difco Laboratories, where he served in several management positions in the areas of purchasing, technical sales support, production and research.

Terri A. Morrical, age 39, joined Neogen Corporation on September 1, 1992 as part of the Company’s acquisition of WTT, Incorporated. She currently serves as Vice President and General Manager of the Company’s Lexington division and is responsible for all sales pertaining to animal safety. Ms. Morrical graduated from Miami University in 1986. From 1986 to 1991, she was Controller for Freeze Point Cold Storage Systems and concurrently served in the same capacity for Powercore, Inc. In 1990, she joined WTT, Incorporated as VP/CFO and then became President, the position she held at the time Neogen acquired the business.

Mark A. Mozola, Ph.D., age 49, became Neogen’s Vice President of Research and Development in 2001 following the Company’s acquisition of GENE-TRAK Systems. He served in various technical and managerial positions at GENE-TRAK Systems for 16 years, most recently as General Manager. He has also served as a Laboratory Director for Silliker Laboratories. Dr. Mozola’s particular technical expertise is in the area of development of modern, rapid methods for the detection of foodborne pathogens.

Jack C. Parnell, age 69, was elected to the Board of Directors in October 1993 and as Chairman in October, 2001. Since 1991, he has held the position of Governmental Relations Advisor with the law firm of Kahn, Soares and Conway. In 1989, Mr. Parnell was appointed by President Bush to serve as Deputy Secretary for the U.S. Department of Agriculture. From 1983 to 1989, he served in three different senior governmental positions for the State of California, including Secretary for the California Department of Food and Agriculture from 1987 to 1989. The firm of Kahn, Soares and Conway currently acts as the Company’s government relations advisor.

Thomas H. Reed, age 59, was elected to the Board of Directors in October 1995 and was elected Secretary in October 1999. Mr. Reed is Special Assistant to the President of Packerland Packing Company. Prior to assuming that position he was Vice President of MLE Marketing, a division of Southern States Cooperative, Inc., and prior

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to assuming that position, he served as President and Chief Financial Officer for Michigan Livestock Exchange. Mr. Reed is a former member of the Board of Directors of the National Livestock Producers Association and is a former chairman of the Michigan State University Board of Trustees.

Dr. Paul S. Satoh, age 67, became Neogen’s Vice President for Research and Development in March 1998 after having spent 26 years as a senior scientist, specialist in information analysis and competitive Intelligence and research manager in the Diagnostic Group at Pharmacia & Upjohn Inc. He joined Neogen after serving nearly six years on Neogen’s Scientific Review Council as an immunology specialist. Dr. Satoh also taught immunopharmacology at the University of Michigan in Ann Arbor while on sabbatical leave from The Upjohn Company. He is an adjunct professor at the National Food Safety and Toxicology Center at Michigan State University since 1998. He has been Vice President for Basic and Exploratory Research since September 2001.

The information required by this Item is incorporated by reference to Neogen’s Proxy Statement to be filed within 120 days of May 31, 2004.

The information required by this Item is incorporated by reference to Neogen’s Proxy Statement to be filed within 120 days of May 31, 2004.

Jack C. Parnell, Chairman of the Board of Directors, is a governmental relations advisor to the law firm of Kahn, Soares & Conway. Kahn, Soares & Conway has been retained by Neogen to represent it in governmental relations matters. The Company pays Kahn, Soares & Conway a monthly fee of $1,750 for ten hours of consulting. The agreement with Kahn, Soares & Conway is terminable by either party at the end of any month.

During the year ended May 31, 2004 and 2003, Ernst & Young billed Neogen for its services as follows:

Audit Fees: Fees for audit services totaled $111,000 in 2004 and $80,000 in 2003, including fees associated with the annual audit, reviews of the Company’s quarterly reports on Form 10-Q and consultations concerning accounting matters associated with the annual audit.

Audit-Related Fees: Fees for audit-related services totaled $29,000 in 2004 and $5,000 in 2003. Audit–related services principally include fees associated with the Form 8-K filings for fiscal 2004 business acquisitions and consultations related to internal control reporting required in 2005 under Section 404 of the Sarbanes-Oxley Act.

Tax Fees: No fees associated with tax matters were incurred with the principal auditing firm in 2004. In 2003 such fees were $1,000.

All Other Fees: There were no other fees incurred with the principal accounting firm in 2004 or 2003.

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PART IV

(a) (1) and (2). The response to this portion of ITEM 15 is submitted as a separate section of this report.

(a) (3). The Exhibits listed on the accompanying Index to Exhibits immediately following the signatures are filed as part of, or incorporated by reference into, this report.

(b). Reports on Form 8-K filed in the quarterly period ended May 31, 2004: Form 8-K dated March 25, 2004 Item 12. Results of Operations and Financial Condition for the Quarter ended February 29, 2004.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

Dated: August 16, 2004

Pursuant to the requirements of the Securities Exchange Act of 1934, this Report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

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Neogen Corporation

Annual Report on Form 10-K

Year Ended May 31, 2004

EXHIBIT INDEX

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ANNUAL REPORT ON FORM 10-K

ITEM 15 (a)(1) AND (2)

LIST OF FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULE

CERTAIN EXHIBITS

FINANCIAL STATEMENT SCHEDULE

YEAR ENDED MAY 31, 2004

NEOGEN CORPORATION

LANSING, MICHIGAN

10-K—ITEM 15(a)(1) AND (2)

NEOGEN CORPORATION AND SUBSIDIARIES

LIST OF FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULES

The following consolidated financial statements of Neogen Corporation and subsidiaries are included in ITEM 8:

Reports of Independent Registered Public Accounting Firms

Consolidated Balance Sheets—May 31, 2004 and 2003

Consolidated Statements of Income—Years ended May 31, 2004, 2003 and 2002

Consolidated Statements of Cash Flows—Years ended May 31, 2004, 2003 and 2002

Notes to consolidated financial statements

The following consolidated financial statement schedule of Neogen Corporation and subsidiaries is included in Item 15(a) (2):

Schedule II—Valuation and qualifying accounts and reserves

All other schedules for which provision is made in the applicable accounting regulation of the United States Securities and Exchange Commission are not required under the related instructions or are inapplicable and, therefore, have been omitted.

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Report of Independent Registered Public Accounting Firm—Ernst & Young LLP

We have audited the accompanying consolidated balance sheets of Neogen Corporation and subsidiaries as of May 31, 2004 and 2003, and the related consolidated statements of income, stockholders’ equity, and cash flows for the years then ended. Our audits also included the financial statement schedule for 2004 and 2003 listed in the Index at Item 15(a). These financial statements and schedule are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements and schedule based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Neogen Corporation and subsidiaries at May 31, 2004 and 2003, and the consolidated results of their operations and their cash flows for the years then ended, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule for 2004 and 2003, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the information set forth therein.

/s/ Ernst & Young LLP

Grand Rapids, Michigan

July 15, 2004

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Report of Independent Registered Public Accounting Firm—Deloitte & Touche LLP

To the Board of Directors

Neogen Corporation

Lansing, Michigan

We have audited the accompanying statements of income, stockholders’ equity, and cash flows of Neogen Corporation for the year ended May 31, 2002. Our audit also included the financial statement schedule for the year ended May 31, 2002 listed in the Index at Item 15(a)(2) These financial statements and financial statement schedule are the responsibility of the Company’s management. Our responsibility is to express an opinion on the financial statements and financial statement schedule based on our audit.

We conducted our audit in accordance with standards of the Public Company Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion.

In our opinion, such 2002 consolidated financial statements present fairly, in all material respects, and the results of the Company’s operations and their cash flows for the year ended May 31, 2002 in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, such financial statement schedule for the year ended May 31, 2002 when considered in relation to the basic consolidated financial statements taken as a whole, presents fairly in all material respects the information set forth therein.

/s/ Deloitte & Touche LLP

Detroit, Michigan

July 26, 2002

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Neogen Corporation and Subsidiaries

Consolidated Balance Sheets

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Neogen Corporation and Subsidiaries

Consolidated Balance Sheets

See accompanying notes to consolidated financial statements.

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Neogen Corporation and Subsidiaries

Consolidated Statements of Income