Case-control study of early-term abortions (early fetal losses) associated with mare reproductive loss syndrome in central Kentucky.

Objective: To identify factors associated with abortions during early gestation classified as mare reproductive loss syndrome (MRLS).

Design: Case-control study.

Animals: 324 broodmares from 43 farms in central Kentucky, including 121 mares from 25 farms that had early-term abortions (ETAs) associated with MRLS (case horses), 120 mares from the same farms but that did not abort, and 83 mares from 18 farms that were not severely Impacted by MRLS.

Case-control study of late-term abortions associated with mare reproductive loss syndrome in central Kentucky.

Objective: To identify factors associated with abortions of mares during late gestation attributed to mare reproductive loss syndrome (MRLS).

Design: Case-control study.

Animals: 282 broodmares from 62 farms in central Kentucky, including 137 mares that had late-term abortions (LTAs) associated with MRLS, 98 mares from the same farms that did not abort, and 48 mares that aborted from causes other than MRLS.