Historical Bayer Animal Health laboratory

A history of protecting animals while benefiting mankind

For more than a century, Bayer Animal Health has been known for its innovative research and uncompromising development of medicines and healthcare products. Building upon this heritage, Bayer Animal Health has established itself as one of the world's leading manufacturers of veterinary solutions in both companion animals and farm animals – helping to keep them healthy. Today, we produce and distribute more than 100 different animal health products in more than 100 countries and in all major markets around the globe.

Our History

By Year
Product Innovation
Business Growth
  • 1897
    The origins of Bayer Animal Health began in a small laboratory in the back of a drugstore in Fresno, Calif. by local druggist E. A. Cutter, who developed the first effective preventative against the deadly and highly infectious disease known as blackleg.
    Bayer Animal Health drugstore laboratory
  • 1903
    Cutter Animal Health products selected Berkeley, Calif., for its new production site, due to being one of the coolest spots in the state.
  • 1921
    Cliff Haver & Dr. E.K. Glover form Haver-Glover Laboratories

    In Kansas City, Cliff Haver and Dr. E.K. Glover formed Haver-Glover Laboratories to market a line of veterinary supplies to “graduate veterinarians”.
  • 1927
    Cliff Haver and Dr. Ashe Lockhart partnered in co-marketing the Ashe Lockhart biologicals.
  • 1940
    Cutter grew to dominate the blackleg vaccine market during the 1940s and 1950s with the introduction of numerous adjuvants added to vaccines to enhance and prolong immunity.


    Ashe Lockhart experienced rapid growth during the early 1940s and had to expand production capacity to meet demand.
    Ashe Lockhart biologicals plant
  • 1955
    Cutter Laboratories acquired Haver-Glover and Ashe Lockhart, merging them to form a new company called Haver-Lockhart.
    Haver-Lockhart Laboratories is formed
  • 1963
    Cutter opted to build a new, state-of-the-art production facility in Shawnee, Kansas, where the operations for Haver-Glover and Ashe Lockhart were finally merged.
    Haver-Lockhart production facility in Shawnee, KS
  • 1970
    Cutter moved its animal health operations from Berkeley, Calif., and merged them with the Haver-Lockhart manufacturing already being done in the Shawnee plant.
    Cutter animal health operations merge with Haver-Lockhart
  • 1974
    Bayer AG acquired Cutter Laboratories as its re-entry into the United States pharmaceutical market. Bayer had not participated in this business for more than 50 years. Bayer's long absence followed the end of World War I, when as part of reparations, all German assets had been nationalized and auctioned off to U.S. interests.

    Bayer’s subsidiary Chemagro, an agricultural chemical company based in Kansas City, merged with Cutter-Haver-Lockhart to form a new company called Bayvet (short for Bayer Veterinary).
  • 1977
    Bayer acquired Miles laboratories, a well-known name in human medicine.
  • 1980
    Bayer purchased a Merriam, Kansas, complex to accommodate the growing need for more office and laboratory space.
  • 1989
    Baytril®, the first quinolone approved for use by veterinarians in dogs and cats, was available in tablet and injectable form.


    Bayer also acquired Diamond Scientific in 1989, which broadened the company’s vaccine product line.
  • 1992
    Miles laboratories became the umbrella name for Bayer’s U.S. operations because the rights to the Bayer name were bought by Sterling Drug and sold to Eastman Kodak. This meant that all Cutter and Haver-Diamond Scientific products became Miles.
  • 1995
    Kodak sold the Bayer name and pharmaceutical line for the United States and Canada to SmithKline Beecham. From that point forward, Bayer was finally able to use the Bayer name to enhance its image with the veterinarian, livestock and poultry producers; and horse and pet owners. All U.S. companies were consolidated to become Bayer, with a separation between the companion animal and food animal product lines.
  • 1997
    Bayer acquired Pharmacia & Upjohn veterinary biologicals and merged them with the established Bayer Animal Health product group.
  • 1998
    Bayer introduced Baytril® 100 (enrofloxacin) Injectable, the first FDA-approved fluoroquinolone antimicrobial for use against Bovine Respiratory Disease (BRD), a disease that costs the cattle industry more than $1 billion annually.
    Bayer introduces Baytril 100 for BRD
  • 1999
    Bayer built a world class pharmaceutical facility in Shawnee, Kansas, where it concentrated its U.S. animal health resources on pharmaceuticals and parasiticides.
  • 2001
    Bayer introduced CyLence® Ultra, the first new insecticide cattle ear tag introduced in the industry in several years.
  • 2006
    Pharmaceutical Manufacturing Services Program was expanded at the Shawnee site.
  • 2008
    The Baytril® 100 line was extended to the dairy cattle industry for BRD as well as for Swine Respiratory Disease (SRD), an equally devastating industry disease.
  • 2012
    Bayer acquired the Animal Health business of KMG Chemicals, Inc., making it one of the broadest insecticide product lines in the world.
  • 2015
    Bayer introduced Zelnate® DNA Immunostimulant, an innovative immunostimulant to aid in the treatment of bovine respiratory disease.
    Bayer introduces Zelnate DNA immunostimulant for BRD
  • 2017
    Bayer acquired the Cydectin® product line to expand its parasiticides line of products.

Zelnate® is based on technology developed by Juvaris BioTherapeutics and is patent protected. Animal Health applications are being exclusively developed by Bayer Animal Health and are the subject of Bayer patent applications.

Baytril® 100 is for use by or on the order of a licensed veterinarian. Extra-label use in food-producing animals is prohibited. Cattle intended for human consumption must not be slaughtered within 28 days from the last treatment. This product is not approved for female dairy cattle 20 months of age or older, including dry dairy cows. Use in these cattle may cause drug residues in milk and/or in calves born to these cows. A 5-day withdrawal is required in swine. The effects of enrofloxacin on cattle or swine reproductive performance, pregnancy and lactation have not been determined.

Keep Cydectin® out of reach of children

See product label for complete product information, indications and application instructions.

Zelnate, Baytril, Cydectin and CyLence are registered trademarks of Bayer.