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Effects Of Bull Exposure And Gonadotropin Releasing Hormone On Postpartum Interval And Fertility In Beef Cowsa, H.L. Miller, R.H. Haigh
Effects Of Bull Exposure And Gonadotropin Releasing Hormone On Postpartum Interval And Fertility In Beef Cowsa, H.L. Miller, R.H. Haigh
South Dakota Beef Report, 1988
Spring calving beef cows were utilized in a study to determine the effects of bull exposure (BE) and Gonadotropin Releasing Hormone (GnRH) administration on return to estrus and reproductive efficiency. Cows were either exposed to an epididectomized bull soon after calving until the breeding season or not exposed to bulls (NE). All cows were synchronized with Synchro-Mate B (SMB). One-half of the BE and NE cows were implanted with GnRH at SMB implant removal in 1987 or given an injection of GnRH at breeding in 1988. Each year, 20 cows were bled hourly for 80 consecutive hours after SMB removal. …