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Tropical and subtropical agroecosystems

versão On-line ISSN 1870-0462

Resumo

ARROYO, J.. Reproductive seasonality of sheep in Mexico. Trop. subtrop. agroecosyt [online]. 2011, vol.14, n.3, pp. 829-845. ISSN 1870-0462.

In order to discuss and analyze the available information concerning the seasonal breeding behavior of sheep in Mexico, this review was conducted. We analyzed the neuroendocrine basis that modulate the annual reproductive cycle in sheep and then discussed the degree of reproductive seasonality in Creole sheep wool, breeds originating in high latitudes and hair sheep, mainly in Pelibuey ewes. The Creole sheep wool show continuous annual reproductive activity and short seasonal anestrous. The females of northern origin, express seasonal reproductive activity, similar to that observed in individuals geographically located at latitudes above 35°. Pelibuey sheep show variable annual reproductive behavior with reduced anestrus or lack thereof. It is suggested that the neuroendocrine mechanisms regulating seasonal anestrus in ewes, are active in the sheep of northern origin that live in Mexico, in a manner contrary is not activated in Creole and hair sheep.

Palavras-chave : Reproductive seasonality; seasonal anestrous; sheep; neuroendocrinology; México.

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