Mares fed to maintain adequate body condition have a higher level of reproductive success than those kept in a lower state of body condition.[3] Parameters including length of time to first ovulation, pregnancy rate, and pregnancy maintenance are all enhanced in mares on an optimal nutritional program. Mares that are thin (Body Condition Score of 4 or less) generally have lower reproductive efficiency. The Body Condition Scoring system developed at Texas A&M University[4] has proven to be a reliable tool for horse breeders in determining the nutritional status and needed changes to optimize the reproductive performance of the mare that is in sound reproductive health.

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