Cows expressing estrus had greater pregnancy rates compared to cows not expressing estrus, and delayed insemination did not ... protocol and cows expressing estrus were inseminated. Cows not expressing estrus received a gonadotropin-releasing hormone ... Delaying AI for 8 hours in cows that failed to express estrus did not improve pregnancy rates. The effects of temperament on ... The overall goal of this work was to determine the influences of estrus expression and timing of artificial insemination (AI), ...