Efecto de la administración de eCG y GnRH-análogo en el desempeño reproductivo de cerdas primíparas destetadas bajo condiciones de alta carga calórica
Palabras clave:
eCG, GnRH, desempeño reproductivo, estrés calórico, cerdas primíparasResumen
Con el objetivo de determinar el efecto de la aplicación de eCG y GnRH-análogo en el desempeño reproductivo de cerdas primíparas que estuvieron en lactación en condiciones de alta carga calórica ambiental, se realizó un estudio durante los meses de junio a octubre. La temperatura ambiental promedio durante el periodo de estudio fue de 30.9 °C y una humedad relativa de 74.6 % (ITH de 83.4 puntos). Se utilizaron 100 cerdas primíparas, a las que se les asignó uno de dos tratamientos (T): T1 (Grupo testigo; n = 50); cerdas que no recibieron tratamiento hormonal posdestete y T2 (eCG + GnRH; n = 50); cerdas que recibieron la aplicación i.m. de 1000 UI de eCG 24 h posdestete y 50 µg de GnRH al momento de la manifestación de celo. Las cerdas que recibieron la aplicación de 1000 UI de eCG tuvieron un menor (p<0.05) intervalo destete-celo (129.41 vs. 218.54 h); sin embargo, la tasa de parto fue menor (p<0.05) en las cerdas que recibieron el tratamiento combinado de 1000 UI de eCG 24 h posdestete y 50 µg de GnRH al momento de la manifestación de celo (66.66 vs. 81.25 %). El tamaño y peso de la camada no fue modificado (p>0.05) por el tratamiento. Los resultados obtenidos permiten concluir, que la aplicación i.m. de 1000 UI eCG 24 h posdestete, a cerdas primerizas destetadas bajo condiciones de alta carga calórica, disminuye el intervalo destete celo, pero la administración combinada de 1000 UI de eCG 24 h posdestete y 50 µg de GnRH al momento de la manifestación de celo disminuye la tasa de parto en cerdas primíparas metabólicamente comprometidas bajo condiciones de alta carga calórica ambiental.
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