Animal Reproduction (AR)
Animal Reproduction (AR)
Original Article

Progesterone profile and reproductive performance of estrous-induced Alpine goats given hCG five days after breeding

J.F. Fonseca, C.A.A. Torres, E.P. Costa, V.V. Maffili, G.R. Carvalho, N.G. Alves, M.A. Rubert

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The objective of this study was to investigate the effect of hCG administration five days after breeding on plasma progesterone concentration (P4) and reproductive performance of estrous-induced Alpine goats. A total of 42 lactating does were treated with intravaginal sponges (MAP, 60 mg) for 9 d plus 200 IU eCG and 22.5 μg d-cloprostenol 24 h before sponge removal. After detection of estrus (day of estrus = day 0) and breeding, females were randomly assigned into two treatments (T1 and T2). In T1 (n=19) and T2 (n=18) the animals received intramuscular injection of 1 ml of saline solution (control) or 250 IU hCG, respectively, 5 d after breeding. P4 (ng/ml) was recorded from blood sampled on days 0, 5, 7, 13, 17, 21, 28 and 45 after breeding. Animals were scanned with the aid of transrectal ultra-sound (5 MHz probe) on days 35 and 70 after breeding, for diagnosis of pregnancy. P4 was higher in the hCG-treated than the control animals only at day 45 (P < 0.05). No effect of treatment on pregnancy and kidding rates, gestation period, prolificacy and fetal weight was recorded (P > 0.05). Results of this study suggest that hCG administration 5 d after breeding may alter the luteal function but not reproductive performance in estrous-induced lactating goats


Goat; hCG; Progesterone; Reproductive Performance
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