To: Kentucky Association of Equine Practitioners (KAEP)

From: KAEP Emerging Disease Committee

Re: Mare Reproductive Loss Syndrome

Based on scientific and diagnostic results available to date, the following are suggestions for veterinarians to discuss with their clients based on a valid veterinary-client-patient relationship. This is subject to change based on updates from scientific results.



1. Keep accurate records on early fetal losses, late term abortions, stillbirths, and foals which fail to thrive.

2. For these and normal deliveries, collect one ounce of manure from the mare in a latex glove and one fecal cup (3 oz.) of grain concentrate fed to the mare. Have these samples frozen by the farm immediately. They should then be delivered frozen to the Livestock Disease Diagnostic Laboratory to the attention of Dr. Kyle Newman. Information should include the date, mare’s name, farm, veterinarian, and brief history of the mare, including medications and supplements (brand names).


For the late term pregnant mares, consider:



  • domperidone

  • mycotoxin binders according to manufacturer’s guidelines

  • probiotics

  • clip pastures to eliminate seed heads, but not so low as to hinder growth

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