In the latest update on Mare Reproductive Loss Syndrome, researchers at the University of Kentucky report the evidence continues to point toward cherry trees and a caterpillar infestation this spring as the likely causes of the problem. Research also has proven negative for hemlock plants as the source of the late-term abortions and foal losses.

The researchers report that an epidemiological survey has been conducted of 133 central Kentucky farms, representing 89% of the 150 farms initially contacted. The survey was compiled by on-site visits to each farm to ensure the “quality of data in the complex 11-page questionnaire,” the briefing stated. The farms surveyed had more than 17,000 horses on their premises as of April 1 and included the Thoroughbred, Standardbred, American Saddlebred, and Morgan breeds.

While the data has been verified and entered into a computer, UK reported “an in-depth analysis of this data is very detailed and is not a fast process.”

However, preliminary analysis of pasture data has revealed several individual risk factors