Abstract
Multiparous Hereford × Angus postpartum cows were used to determine the effects of treatment with estradiol cypionate (ECP) on estrus and luteal activity (LA) of thin ( 1 ng/mL for 1 d) within 10 d after treatment (P = 0.52). Days to normal LA were greater (P = 0.02) for thin and moderate cows treated with ECP at 25 d after calving (74 ± 5 d) compared with control cows (61 ± 5 d), and ECP treatment tended to increase (P = 0.07) days to LA for thin cows treated at 50 d after calving. Although ECP induced estrus in beef cows during the first 50 d after calving, normal luteal function was not initiated.
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