Determinants of ram sexual behavior and its impact on sheep breeding

In sheep, anatomical characteristics of the cervix and animal value limit the application of reproductive technologies; therefore, most breeding is a natural service. Rams are selected based on desired physical traits and semen capacity, but their contribution to flock genetics is constrained by the expression of sexual behavior. In 1964, it was first reported that approximately one-third of rams expressed limited sexual interest toward ewes in estrus. Therefore, if rams were evaluated for expression of sexual behavior, it is estimated that as many rams would be culled for the lack of behavior as are currently culled for semen quality or physical ...

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