Pilot Study Implicates Outer Portion of ETC

Since the beginning of the mare reproductive loss syndrome in 2001, there have been many theories as to the cause of the problems. Honing in on the extreme number of Eastern tent caterpillars (ETC) in 2001 and 2002, studies have shown that early fetal loss can be caused by feeding ETC to pregnant mares. It also has been shown that freezing the caterpillars does not destroy whatever toxin or organism (virus or bacteria) is causing problems, since frozen ETC have been used experimentally. The abortogenic cause associated with ETC also isn’t only found in Kentucky, since ETC from Michigan were used in one study.

Bill Bernard, DVM, Dipl. ACVIM, of Rood and Riddle Equine Hospital in Lexington, Ky., who with Michelle LeBlanc, DVM, Dipl. ACT, conducted a study on caterpillars and frass earlier this year, did a pilot study to try and determine if it was the intestinal contents of the caterpillar or the integuement (external portion) of the caterpillar that was associated with early fetal loss. The results indicated that it is something external on the caterpillar that is associated with abortion, not something in the GI tract. He hopes to continue this research in a double-blinded study in the spring.

A meeting on MRLS open to all breeds and disciplines will be hosted by the Kentucky Thoroughbred Farm Managers Club meeting tomorrow, Nov. 5, at Embassy Suites in Lexington. Bernard, president of the Kentucky Association of Equine Practitioners, will present findings from those two research projects, and others working with MRLS research and practitioners in the field, will be on a panel and available to answer questions. Deadline for reservations is Monday, Nov. 4, at 5 p.m. by calling 296-4279. Reservations cost $20 and include dinner.

About the Author

Kimberly S. Brown

Kimberly S. Brown was the Publisher/Editor of The Horse: Your Guide To Equine Health Care from June 2008 to March 2010, and she served in various positions at Blood-Horse Publications since 1980.

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