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Bio-Vet researches, manufactures and markets innovative direct fed microbial (probiotic) products.  Founded in 1991, as a division of a larger animal nutrition company, we incorporated in 1996 and have functioned as an independent entity ever since.

In 1994, Bio-Vet received its first patent (U.S. Patent 5,310,555) for its capsule-in-a-capsule© packaging technique for direct fed microbial and nutritional combinations. This innovative system continues to be the flagship for Bio-Vet and all direct fed microbial/nutritional combination products. We now hold two patents for this critical packaging technique.

Today, we offer a complete line of products, including capsules, boluses, pastes, soluble powders, calf and cattle electrolytes and daily feed additives. Our product line continues to expand as new technology in the direct fed microbial industry becomes available. Bio-Vet products are key components of a complete nutritional program for livestock.

Corporate Management


Bill Zimmer.jpgWilliam A. Zimmer, D.V.M. 

President / Director of Research and Development

As the President of Bio-Vet, Inc., Dr. Bill Zimmer is involved with all aspects of the company. He specializes in development of direct fed microbial products, incorporating DFM's into farm programs, educating clients and animal producers on the proper use and expectations of probiotics and nutrition, and researching the effects of DFM's on various animal production systems. 

Dr. Zimmer left a successful mixed animal practice in 1990 to concentrate on animal nutrition and natural systems of animal production. While his current focus is on direct fed microbial systems for animals, he also has extensive knowledge in the interrelationship of animal health, nutrition and soil biological and fertility systems.

He is a 1988 graduate of the University of Wisconsin School of Veterinary Medicine.


Gary GrimsmanGary Grimsman 

National Sales Director

Gary Grimsman is National Sales Director and has been with the company since 1998. His previous positions included Senior Account Manager and Regional Representative.

As National Sales Director, Gary is involved with all aspects of the company, specializing in sales of Bio-Vet’s packaged goods and direct fed microbial products. He manages Bio-Vet’s sales force and coordinates new territory development.

A native of Carroll, Iowa, Gary has been involved in the animal health and nutrition business his entire life. He worked for a veterinary clinic and managed processing, nutrition consulting and vaccination work in major feedyards in western Iowa. Gary’s career experience includes the development and sale of his own line of calcium drenches for dairy cattle.


Don FaberDonald G. Faber 

Bio-Vet Board of Directors & Special Assignment

Don Faber is an active member of the Bio-Vet Board of Directors. Don has over 35 years of experience in corporate strategic planning and fiscal overview, ranging from large corporations to governmental agencies and entrepreneurial start-ups. Don served eight years in the USAF Pararescue from 1967-1975. His work experience highlights include six years as a planning analyst for Aramco (Saudi Arabia) and as a Co-founder of Midwestern BioAg Inc. Don has a BS in Biology (1979) and a MBA with an emphasis in Finance (1989).

Don is currently on special assignment to the Bio-Vet Board of Directors to develop and implement Bio-Vet growth and business success.


Rebecca WienkesRebecca Wienkes

Chief Financial & Administrative Officer

Rebecca (Becky) Wienkes has been involved in agriculture her entire life, growing up on a 60-head dairy farm in Iowa County, Wisconsin. She has more than 20 years of experience working with agriculture and agribusiness clients as a Certified Public Accountant (CPA).

She most recently was Tax and Accounting Manager with Badgerland Financial in Dodgeville, WI, where she managed Badgerland’s Southwest Wisconsin tax and accounting team. Prior to that, she operated her own accounting firm for several years, and worked for an accounting firm in Dodgeville as a CPA and tax consultant before that.

Becky graduated from the University of Wisconsin-Platteville with a bachelor’s degree in Business Administration (Finance), with an accounting minor. She passed the CPA Exam and along the way earned a Wisconsin CPA Association High Achievement Award for being a top scorer on the exam.

Becky and her husband, Dale, have four children and reside on and operate a beef and crop farm near Highland, WI. 



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