2001, Número 2
Los fenómenos de bioestimulación sexual en ovejas y cabras
Álvarez RL, Zarco QLA
Idioma: Español/Inglés
Referencias bibliográficas: 106
Paginas: 117-129
Archivo PDF: 127.01 Kb.
RESUMEN
La introducción del macho y hembras en estro a grupos de ovejas y cabras anéstricas, provoca una respuesta ovulatoria sincronizada en los primeros tres a cinco días siguientes (efectos macho y hembra). La señal del macho es principalmente feromonal y desencadena un incremento en la frecuencia y amplitud de los pulsos de la hormona luteinizante (LH). El porcentaje de hembras ovulando en respuesta al olor del macho es menor que cuando existe contacto físico total con el semental, esto último indica que otros sentidos están involucrados en la mediación del fenómeno pero ninguno es indispensable. La poca evidencia existente, parece indicar que el mecanismo que desencadena el efecto hembra es el mismo. En un porcentaje variable de hembras, la primera ovulación inducida es silenciosa y es seguida por una fase lútea corta. La fase lútea corta se sigue de un segundo pico de LH y la ovulación inducida origina un cuerpo lúteo de características normales. La profundidad del anestro y la actividad sexual del macho afectan la respuesta. Cuando el anestro es profundo y los machos manifiestan poca actividad sexual el porcentaje de ovulaciones silenciosas y de ciclos cortos se incrementa. En el efecto hembra, la profundidad del anestro reduce también la respuesta. En la presente revisión se discuten todos los sentidos y los factores que probablemente están involucrados en la respuesta a los efectos macho y hembra.
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