Dr. Stephen E. Duren, Performance Horse Nutrition, LLC
M.S. PAS Ph.D. Equine Nutrition and Exercise Physiology, CEO and Founder 

Dr. Stephen E. Duren

Dr. Stephen Duren, a native of Soda Springs, Idaho, holds a Bachelor of Science in Animal Sciences from the University of Idaho and both a Master’s and Doctorate in Equine Nutrition and Exercise Physiology from the University of Kentucky. His research explored fat supplementation in racehorses and blood flow changes during exercise. Recognized by the American Registry of Professional Animal Scientists and the Equine Science Society—where he served on the Board of Directors—Dr. Duren is widely respected in the field of equine nutrition.

 

With extensive professional experience, he has served as a consulting nutritionist for leading breeding farms and feed manufacturers across the U.S. and internationally, including Europe, Australia, New Zealand, Jamaica, and Canada. In 2002, he founded Performance Horse Nutrition®, LLC, through which he continues to advise feed companies and horse farms worldwide. His clients include LMF Feeds, Poulin Grain, Robank Feeds, EBM, and renowned farms such as Winstar, Elm Tree, Tamarack Ranch, Bjorn Baker Racing, and Yarraman Park Stud.

Dr. Duren is the author of The 101 Most Frequently Asked Horse Nutrition Questions and co‑author of The Concise Guide to Nutrition in the Horse. What sets him apart is his lifelong horsemanship—he has owned and competed with horses himself, giving him a unique perspective on the connection between diet and performance. His formulations have fueled winners at every level, from local shows to prestigious racetracks, Olympic stadiums, and arenas around the world.

  • Academic Excellence:  B.S. in Animal Sciences (University of Idaho); M.S. & Ph.D. in Equine Nutrition and Exercise Physiology (University of Kentucky)

  • Global Experience: Consulting work with feed manufacturers and horse farms across the U.S., Europe, Australia, New Zealand, Jamaica, Canada, and Japan

  • Publications: Author of The 101 Most Frequently Asked Horse Nutrition Questions and co‑author of The Concise Guide to Nutrition in the Horse

  • Professional Recognition: Member of the American Registry of Professional Animal Scientists; served on the Board of Directors for the Equine Science Society

  • Horsemanship: Lifelong horse owner and competitor, ensuring diets and supplements are practical, performance‑driven, and proven at every level of competition

PROFESSIONAL EXPERIENCE
  • 2002 to Present - Equine Nutritionist, President, Owner – Performance Horse Nutrition, Idaho.
  • 2002 to Present -  Adjunct Faculty Member – Washington State University, College of Veterinary Medicine, Pullman, WA.
  • 1990 to Present – Over 30 years of professional experience in formulation of equine feeds and supplements. Presented well over 1500 lectures, both scientific and non-scientific, on horse nutrition and exercise physiology.
  • 1994 to 2002 – Consulting Equine Nutritionist – Kentucky Equine Research, Versailles, KY
  • 1991 to 1994 – Technical Services Nutritionist, Post Time Horse Feed, McCauley Bros., Inc. Versailles, KY. 1989 to 1991: Consulting Equine Nutritionist, Post Time Horse Feed, McCauley Bros., Inc. Versailles, KY.
EDUCATION
  • 1990 – Doctorate, University of Kentucky, Lexington, KY. Ph.D. Degree in Animal Science. Dissertation Title: Blood flow distribution in fasted and fed ponies at rest and during endurance exercise.
  • 1986 – Masters, University of Kentucky, Lexington, KY. M.S. Degree in Animal Science. Thesis Title: Dietary fat and exercise in Thoroughbred horses.
  • 1984 – Cum Laude Graduate, University of Idaho, Moscow, ID. B.S. Degree in Animal Science.
PUBLICATIONS
 

The 101 questions in the book represent actual feeding and nutrition questions that were asked of Dr. Duren when he was speaking at various equine events. He made a point of writing down these questions because it seemed that wherever he went in the world many people had either the exact same nutrition question or similar question.

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Horses are especially sensitive to change of feed as well as poor-quality feed and pasture, which is why this book is must reading for anyone who looks after a horse. Topics covered include feeding for growth, maintenance, exercise, and during pregnancy and lactation.

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Performance Horse Nutrition® (PHN®) was founded in 2002 by Dr. Stephen Duren. The goal of PHN has always been to advance the “science” of feeding horses, and equally important to disseminate that science to our clients in the simplest, most straightforward means possible. PHN prides itself on having trained Ph.D equine nutritionists that are not only scientists, but also horsemen. We understand how to feed horses and our feeds, feeding recommendations, articles and seminars reflect that understanding. Please refer to our list of services to further clarify what we can do for our clients.
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