College of Agriculture
Veterinary Science	Mare Reproductive Loss Syndrome Index Page

April 25, 2002

Result of Recently Completed Field Study

Ninety-one pregnant Thoroughbred mares on 8 farms in central Kentucky were studied by regular ultrasound examination to monitor the possible effects of exposure to MRLS during 2001. The study was a collaborative project between veterinarians of Hagyard-Davidson-McGee Associates and the University of Kentucky. It involved a comparison between 58 mares exposed to MRLS and 33 not exposed, bred during February and through March 15, 2001.

The results from the study population indicated that MRLS had no effect on the incidence of fetal loss, fetal abnormality and placental and foal weight at birth.