Pat Griffin, DVM, PhD, DACT

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Articles by Dr. Griffin:

  • We’re often asked if it’s safe to exercise your pregnant mare, to what degree she should be worked, and when you should stop working her. Your broodmare is safe to be worked and ridden as needed. Read on to hear what Dr. Griffin has to say about breeding mares and exercise.

  • One of the most important parts of equine reproduction is choosing the right time to breed your mare. Dr. Griffin explains here how to choose when to breed your mare.

  • Before deciding to breed your mare, and while you’re choosing what stallion to use, make sure you test your horse for various genetic diseases. You should know what crosses might produce a lethal or performance limiting genetic issue.

  • Freezing your stallion’s semen can be beneficial for numerous situations, including an aging stud, a stallion who needs to be in the show ring during breeding season, and high demand from distance mares. Dr. Griffin explains the benefits of freezing semen, the process, and how it impacts the equine breeding industry.

  • There are various options for breeding mares interested in your stallion. Here, Dr. Griffin reviews the differences between live, fresh, fresh-cooled, and frozen semen, and what you need to consider when deciding what breeding options to offer for your stallion.

  • As we all know, “No hoof, no horse”! Here, Dr. Griffin reviews what a “normal” hoof looks like, and how to take some basic measurements to ensure a balanced hoof.


  • Veterinary Degree, Colorado State University

  • Masters and PhD in Reproductive Physiology, University of Wisconsin - Madison

  • Board certified, American College of Theriogenologists (Equine Reproduction)

Areas of Interest:

  • High-risk Mare Management

  • Lameness and Sports Performance

  • Stallion Fertility Evaluation

  • Embryo Transfers

During his graduate work, Dr. Griffin’s research focused on the interactions between the maternal environment and the embryo and fetus. He has published numerous scientific papers on this and other subjects, and is an active member of numerous professional organizations involved in equine veterinary and reproductive medicine. Dr. Griffin has been in private practice for the last 20 years, specializing in equine reproduction. He practiced first in the Central Valley of California for 5 years and, subsequently, in Madison, Wisconsin for the last 15 years.

Dr. Griffin’s professional and research interests are wide-ranging and include the assessment and management of the high-risk broodmare, as well as the development of objective methods for evaluation of stallion fertility.  He has extensive experience in management of the problem broodmare, management of the mare for artificial insemination using cooled or frozen semen, embryo transfer, and the cryopreservation of stallion semen.  In addition, he maintains a strong interest in lameness evaluation and therapy.