Abstract
Summary An understanding of clinically relevant aspects of equine reproductive physiology is helpful to the stud farm practitioner. Anestrus and transition can delay the desired onset of the breeding season and reduce the number of opportunities to establish pregnancy during the season. Although alteration of the photoperiod has long been accepted as the best way to advance the breeding season, recent research may provide additional assistance for hastening the onset of cyclicity. During the breeding season, knowing the pattern of ovulation in mares, both in general and for a particular mare, can be very beneficial in timing insemination for optimum conception rates. Likewise, appreciating the effects of luteolytic agents on aspects of reproductive physiology other than regression of the corpus luteum, such as on follicular development, ovulation, and development of hemorrhagic anovulatory follicles, can assist the clinician in improving breeding efficiency in mares.
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