Abstract
he aim of this study was to evaluate the effect of double injection of d-cloprostenol associated or not with equine chorionic gonadotrophin (eCG) over the reproduction performance of ½ Boer/non-genotype goats raised in the semi-arid region of North-eastern Brazil. Forty goats were distributed into two estrus synchronization protocols, as following: T1 (n = 20) two injections of 75 µg d-cloprostenol at seven days interval; T2 (n = 20), similar to the previous protocol, differing only by the addition of 300 IU eCG at the last d-cloprostenol injection. Percentage of animals in estrus (65% vs. 85%) and interval from the end of treatment to estrus onset (22.8 ± 13.4 h vs. 17.2 ± 7.6 h) did not differ (P>0.05) between T1 and T2, respectively. However, T2 showed a larger estrus length (P KEY WORDS: Estrus synchronization, goats, gonadotrophin, productive performance, prostaglandin.
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