Respuesta reproductiva de ovejas multíparas postparto y nulíparas a inyecciones de GnRH y prostaglandina F2α
Palabras clave:
folículos ováricos, gonadotropinas, luteolisis, parición, preñez, prolificidadResumen
El objetivo fue comparar la respuesta reproductiva de ovejas multíparas postparto y nulíparas a inyecciones de GnRH y PGF2α. Las ovejas en G1 (n=14) estaban lactando, vacías con 68.21±13.48 días posparto. Las ovejas en G2 (n=13) estaban lactando, vacías con 93.76±7.25 días posparto. Las ovejas en G3 (n=14) estaban vacías y no lactando. Ultrasonografía transrectal fue llevada a cabo, nueve días aparte, para medir actividad ovárica. Posteriormente, las ovejas recibieron dos inyecciones, nueve días aparte, de GnRH. Una inyección de PGF2α y una tercera de GnRH fueron proporcionadas a las ovejas el día siete y nueve, después de la segunda inyección de GnRH. El número de ovejas con cuerpo lúteo fue mayor después de las inyecciones con GRH (P≤0.05). La población folicular fue mayor (P≤0.05) en ovejas del G1 que en las del G2 y G3. El diámetro del folículo más grande fue mayor (P≤0.05) en ovejas del G2 que en las del G1 y G3. La incidencia de celos y tasa de gestaciones no fueron afectados (P>0.05). En conclusión, dos inyecciones de GnRH incrementaron la incidencia de cuerpos lúteos, e igualó la incidencia de celos y la tasa de gestaciones después de la inyección con PGF2α en ovejas multíparas postparto en comparación con ovejas nulíparas.
http://dx.doi.org/10.21929/abavet2022.31
e2022-23
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