Delgadillo SJA, Flores CJA, Véliz DFG, Duarte MG, Vielma SJ, Poindron MP, Malpaux B

Language: English/Spanish
References: 35
Page: 69-79
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ABSTRACT

Local goats from the north of Mexico, especially those from the Comarca Lagunera region (26°N), display reproductive seasonality. The non-breeding season ranges from january to april in males, and from march to august in females. In both sexes, seasonality is provoked by photoperiodic changes. Short days stimulate sexual activity, while long days inhibit it. Moreover, 2.5 months of long days, alone or followed by the subcutaneous insertion of two melatonin implants, stimulate the sexual activity of males from february to april. In females, estrus and ovulatory activities can be induced during the anestrus season by the male effect, but only if sexually active males subjected previously to a photoperiodic treatment are used. Indeed, males treated with long days alone, or long days followed by melatonin, induce sexual activity in 100% of females, while sexually inactive control males stimulate only about 10% of them. These results indicate that the response of the females to the male effect depends on the intensity of the sexual activity of the males.

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