Gonadotropina coriónica equina (eCG) y gen GDF9 en el comportamiento reproductivo de ovejas raza Katahdin

Equine chorionic gonadotropin (eCG) and GDF9 gene on the reproductive performance of Katahdin sheep

Objetivo. Determinar la influencia de la aplicación de gonadotropina coriónica equina (eCG) y la presencia del exón 2 del gen GDF9 en variables reproductivas en ovejas de la raza Katahdin en época de transición. Materiales y métodos. Se utilizaron 63 ovejas con edad y peso promedio de 2.83±0.89 años y 45.32±5.44 kg, respectivamente. Se usó un arreglo factorial 2x2 bajo un diseño completamente al azar, donde los factores y niveles fueron: la ausencia o presencia del exón 2 del gen GDF9 y la aplicación o no de la hormona eCG en el protocolo de sincronización. Resultados. La aplicación de eCG mostró un efecto significativo favorable en el comportamiento reproductivo de las ovejas, no así para la presencia del exón 2 del gen GDF9. Los tratamientos T2 y T4 fueron superiores en las variables % de gestación, % de parición, fecundidad y prolificidad con respecto a T1 y T3. La mejor respuesta reproductiva se obtuvo con la aplicación de eCG independiente de la presencia o ausencia del gen. Conclusiones. Este estudio muestra evidencia de la nula interacción del exón 2 del gen GDF9 y la eCG para mejorar el rendimiento reproductivo de ovejas. Se recomienda la aplicación de eCG en protocolos de sincronización de estros para ovejas de la raza Kathadin en época de transición. Frente a los pocos reportes genómicos en la raza, se muestra evidencia de la necesidad para realizar otras investigaciones de las variantes genéticas y su relación con la reproducción en ovejas.

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