Ancillary Semen Tests for Stallions: Which Ones to Use and What Do They Mean
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Introduction
Actual fertility trials are the best gauge of a stallion’s fertility, be it under natural-cover or artificial-insemination conditions. Nonetheless, use of such trials to assess the intrinsic fertility of a stallion can be complicated by factors such as mare fertility, management issues, time concerns, and associated expenses. Laboratory based examination of semen generally has good predictive value regarding the fertility of a stallion, at least from the perspective of determining if a given stallion will be highly subfertile or have commercially acceptable fertility. Such an examination is generally done for one of four reasons: 1) as part of a pre-purchase examination; 2) as a quality control measure prior to the onset of a breeding season; 3) when reduced fertility is apparent or suspected, or 4) prior to acquisition of some types of fertility-related insurance. [...]
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