High out-of-season fertility in progesterone-treated goats joined with sexually active bucks and artificially inseminated with fresh diluted semen.

In seasonal anestrous goats, artificial insemination (AI) is typically preceded by hormonal treatment. This study examined whether high fertility can be achieved after AI with fresh diluted semen in progesterone (P4)-treated goats exposed to sexually active (SA) bucks. In Experiment 1, two groups of goats (n = 30 each) were joined with SA bucks (n = 2 per group) fitted with abdominal aprons.

Physical separation and reduction of contact duration with sexually hyperactive bucks decrease testosterone concentrations and sexual behaviour in bucks in sexual rest.

Sexually hyperactive bucks are more efficient than sexually hypoactive bucks in stimulating testosterone secretion and sexual behaviour in other bucks in seasonal sexual rest by the phenomenon that we called the "buck-to-buck effect". Here, we determined whether physical separation and reduction of the duration of contact with the sexually hyperactive bucks would modify those parameters in sexually hypoactive bucks exposed to the "buck-to-buck effect". Bucks were subjected to natural day length throughout the study; this was the sexually hypoactive group.