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Microscopic Analysis of Animal Feeds & Pet Foods

Windsor Laboratories has served the animal feed and pet food industries since 1990, offering rapid and reliable microscopic analysis of agricultural products and pet foods. At Windsor Laboratories, we offer microscopic examination and identification of food and animal feed for pet and human food industries, as well as for private and educational agricultural concerns.  Our services include qualitative and quantitative identification of feed and food ingredients, identification of foreign material, and determination of purity of raw ingredients. Since 1990, Windsor Laboratories has been solving problems in the food and feed industries product lines - from raw ingredients to finished products and byproducts.

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Discover Our Expertise

Windsor Laboratories exists to solve the critical issues facing our clients, both large and small. Our unique approach is not only what differentiates us, but also what makes us successful. We provide a broad range of services and solutions to help those in the animal feed and pet food industries achieve their vision and optimize performance and productivity.

Identification of Major Ingredients & Minerals:

Each sample submitted for microscopic evaluation is separated into density-dependent fractions to allow for precise identification of ingredients.  Samples are examined using state-of-the-art compound and stereo microscopy. Photomicrography of samples is available upon request for an additional charge.

Pelleted Feeds: $100.00

Textured/Bulky Feeds: $130.00

Identification of Banned Ruminant Proteins: $100.00

Identification of Raw Ingredients for Purity: $100.00

48 Hour 'Rush' service: $60.00


Identification of Foreign Material and Adulterants

Examination for the presence of contamination or adulteration is essential for the production and manufacture of high quality animal feeds and pet foods.  The presence of by-product meal is easily accomplished using microscopic analysis.  The identification of banned ruminant proteins in either raw ingredients of finished feeds is necessary to prevent the transmission of prion diseases such as "Mad Cow."

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Submitting Samples

Please observe the three I's of sample submission: identification, instruction, invoicing.


  • First, preferably, describe the type of material by name ("Calf Starter," "Fish Meal," "Poultry Meal".

  • Then code it by number (sample number, lot number, car number, etc.). In any case we'll look for all the identification we can find on your sample container and cover letter.

  • When writing on on plastic, metal or glass surfaces, make sure to use a waterproof marker (Sharpie® by Sanford is an excellent felt tip pen).


  • Your instructions should be written on company or organization stationery and should be signed.

  • Indicate specific, individual tests such as "Microscopic Analysis" or "Identification of by-product meal."


  • When more than one party is to receive copies of results, make sure to indicate which party will pay the invoice!

  • If your organization's policies require that invoices go directly to an accounts payable unit rather than to the person submitting the samples, it is critical to provide a purchase order or other purchase document which your A/P will honor.

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Windsor Laboratories

Contact us and find how our services can benefit your company.

ATTN: James V. Makowski, PhD.

894 Hawthorn Avenue
Mechanicsburg, PA 17055


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