Full Length Research Article QUALITY OF SEMEN COLLECTED BY TRANSRECTAL MASSAGE IN BULLS RESTRAINED IN THE PRESENCE OF A COW

The purpose of this experiment was to determine the effect of PGF and GnRH treatment and exposure of bulls to estrus-cows on semen quality collected by transrectal massage. Three fertile, pure Frisian bulls, 2-3 years old, were followed up weekly for four periods of treatment (control, exposure to estrus-cows, PGF and GnRH). The bulls exposure to a cow in estrus showed high semen volume (3.3±1.3 ml), percentage of progressive motility of sperm (73.3±12.0 %; P 60 minutes before collection of semen. The lower quality semen after treatment by PGF and GnRH requires further investigation.