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Effects Of Bull Exposure On Post-Partum Interval And Reproductive Performance In Beef Cows, C.D. Naasz, H.L. Miller, R.H. Haigh
Effects Of Bull Exposure On Post-Partum Interval And Reproductive Performance In Beef Cows, C.D. Naasz, H.L. Miller, R.H. Haigh
South Dakota Beef Report, 1987
Spring calving beef cows were utilized to study the effect of bull exposure early postpartum on return to estrus and fertility. In the spring of 1985 and 1986, cows were randomly exposed to epididectomized bulls 3 to 7 days after calving until beginning of the breeding season or not exposed to bulls. Cows were observed for estrus twice daily beginning approximately 4 weeks after the start of calving until synchronization. I n 1986, blood samples were collected weekly by jugular venipuncture during heat detection and serum progesterone concentrations were determined. ALL cows were synchronized with Synchro-Mate B and inseminated 48 …