Comparison of Reproductive Performance in Raieni Goats Following Different Estrous Synchronization Methods and Subsequent ECG Treatment During the Natural Breeding Season

摘要

This experiment was performed to determine the effectiveness of different synchronization methodsand one dose of eCG treatment on the reproductive performance in adult Raieni goats. In this experiment,96 goats were allocated into three groups, treated with fluorogestone acetate (FGA) sponges or controlledinternal drug release (CIDR) for 14 days and two injections (250 μg) cloprostenol with 13 interval. The goatsin groups 1 and 2 were injected intramuscularly with 350 IU eCG (Intervet, The Netherlands) at the time ofprogestagen removal from the vagina on day 14. The second injection of cloprostenol in group 3 coincides withthe injection of eCG at the time of CIDR and sponge removal in groups 1 and 2. The interval to onset of estruswas detected by using five aproned bucks. The estrous synchronized after heat detection was artificiallyinseminated with diluted semen of fertile bucks. Twenty one days after insemination, blood samples were takenfrom jugular vein in 10-ml vacuum tubes (venoject) for pregnancy diagnosis. No significant difference wasobserved for the interval between the end of the synchronization protocol and the standing heat amongsttreatments. Blood serum progesterone level (overall mean: 4.90 ± 0.41 ng/ml; SEM), non-return rate to estrusand the kidding rate were not significantly affected by the synchronization methods. Prolificacy and fecunditywere not significantly affected by the synchronization methods; however, cloprostenol method was found tobe more convenient and economical under the conditions of this experiment.