Estrus, ovulatory responses, conception and related phenomena were investigated in Hereford beef cattle treated with exogenous gonadotropins to induce multiple pregnancy. The ovulatory response was judged by the number of corpora lutea estimated by palpation per rectum.
Patterns of behavioral estrus, cervical mucus, metcstrous bleeding and mounting were recorded in untreated cattle. Mounting other cows during diestrus was as frequent as mounting bulls. Thirty-two per cent of the cycles were accompanied by metestrous bleeding; and in 3 per cent of the cycles, bleeding was not at metestrus.
In PMS-treated cattle, the frequency of split estrus was inversely related to the time interval between PMS injection and subsequent estrus; ovulatory response was highest when the interval was 4 days. PMS caused no increase in the frequency of weak estrus or of quiet ovulation. HCG
Estrus, ovulatory responses, conception and related phenomena were investigated in Hereford beef cattle treated with exogenous gonadotropins to induce multiple pregnancy. The ovulatory response was judged by the number of corpora lutea estimated by palpation per rectum.Patterns of behavioral estrus, cervical mucus, metcstrous bleeding and mounting were recorded in untreated cattle. Mounting other cows during diestrus was as frequent as mounting bulls. Thirty-two per cent of the cycles were accompanied by metestrous bleeding; and in 3 per cent of the cycles, bleeding was not at metestrus.In PMS-treated cattle, the frequency of split estrus was inversely related to the time interval between PMS injection and subsequent estrus; ovulatory response was highest when the interval was 4 days. PMS caused no increase in the frequency of weak estrus or of quiet ovulation. HCG
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