Concentraciones de progesterona durante el ciclo estral en ovinos en el trópico colombiano


Paola Alvarado-García
Mónica Torres Cruz
Henry Alberto Grajales-Lombana

Objetivo. Se evaluó la eficiencia en detección de calores, determinación de la duración y tipo de ciclo estral y concentración de progesterona en biotipos raciales ovinos, en el trópico alto. Materiales y Métodos. En 32 ovejas adultas, biotipo Criolla, Hampshire, Romney Marsh y Corriedale, durante el periodo posparto, se determinó la Eficiencia en Detección de Calores - EDC, tipo de ciclo: Corto – CC, Regular - CR y Largo - CL, Duración del Ciclo Estral – DCE y concentraciones de progesterona – CP4. Las CP4 se valoraron mediante técnica de ELISA. El análisis estadístico usó un modelo completamente al azar y medidas repetidas en el tiempo. Resultados. La EDC en promedio fue de 64.88%, presentándose 35.12% CC, 59.92% CR y 4.96% CL. El promedio de DCE regular fue de 16.9±0.89 días. El grupo Criollo presentó los mayores rangos de variación de la CP4, evidenciando cambios en su actividad esteroidogénica del cuerpo luteo semejante a lo observado con el grupo Hampshire. Entre el día 4 y 12 el grupo Romney Marsh presentó los menores CP4., siendo semejante al comportamiento del grupo Corriedale. Conclusiones. Las CP4 incrementan los días 2 a 6, manteniéndose altos y constantes entre los días 10 - 12, disminuyendo gradualmente hasta el día 18, evidenciando progresivamente una posible luteolisis funcional que conduce a una luteolisis estructural. Las CP4 pueden estar asociadas a fenómenos de adaptación de algunos grupos raciales, que afectan la eficiencia reproductiva que se observa es diferenciada entre ellos.

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