Male effect interspecies: Induction of estrous in milk goats by the presence of a ram

Resumen

The work was conducted to study the male effect interspecies in the induction of estrous in goats by the presence of a ram. 64 Saanen goats had been separated in two groups, each with 16 pluriparous (Pl) and 18 nulliparous (Nl). The first group was exposed to a ram (RME) and the second to a buck (BME), both during 42 days. It was recorded the: interval between the introduction of the male and the beginning of the first estrous, number of females that had estrous, conception and parity rates, duration of the estrous and number of short cycles. The male effect with the ram was more efficient with the Nl than the Pl: In the Nl, the number of females in estrous was significantly higher (P<0.05) in the RME in compare with the BME with 15 and 03 goats in estrous, respectively. In the Pl the results were the same (13 goats in each). The conception and parity rates in the Nl were also significantly higher (P<0.05) with 85.7% in the RME against 33% in the BME. In additional, in the Pl, it didn’t have significant difference in regard to the conception and parity rates, with 75% and 41.7% in the BME against 66.7% and 85.3% in the RME, respectively. In conclusion, the male effect interspecies present a good efficiency for induction of estrous in nulliparous goats, what can be able to consist in an efficient option for accomplishment of the male effect in