Abstract
PRIMIPAROUS heifers normally have a longer interval from parturition to oestrus, ovulation and subsequent conception than do mature cows. Lactation also extends this interval. We have therefore measured simultaneously luteinising hormone (LH) and individual progestins within the same serum sample throughout the postpartum interval in the bovine species in order to elucidate the endocrine events that occur before the first oestrus.
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TRIBBLE, R., SORENSEN, A., WOODWARD, T. et al. Serum Progestins and Luteinising Hormone Levels in Non-suckled Primiparous Heifers. Nature 246, 494–495 (1973). https://doi.org/10.1038/246494a0
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DOI: https://doi.org/10.1038/246494a0
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