La bioestimulación sexual periconcepcional induce concepción anticipada, pero no mejora la fertilidad ni la eficiencia reproductiva en cabras
DOI:
https://doi.org/10.18633/biotecnia.v27.2660Palabras clave:
Efecto Macho, Experimentada, Joven, Alpina, SaanenResumen
El efecto macho induce la actividad reproductiva en hembras caprinas, sin embargo, no se sabe si acelera el tiempo de concepción e incrementa la eficiencia reproductiva. En un análisis retrospectivo (2019-2021), se analizaron 415 registros reproductivos de hembras caprinas (Saanen-Alpina) con (n=314;H-CON) o sin (n=101;H-SIN) experiencia sexual para determinar si la bioestimulación sexual periconcepcional promueve una concepción anticipada después de la introducción de machos fértiles, aumenta la proporción de hembras gestantes en el primer ciclo reproductivo, e incrementa la eficiencia reproductiva. Previo al empadre, las hembras fueron (n=292;H-EM) o no (n=123;H-NEM) estimuladas con machos vasectomizados por 21-días y posteriormente empadradas con machos fértiles en monta natural por 42-días. H-NEM y H-SIN (P<0.001) quedaron gestantes más rápidamente (10-días) que H-CON (13-días) o H-EM (16-días). Una alta proporción de H-NEM (95%) o H-EM (72%) anticiparon la concepción a su primer ciclo reproductivo (P<0.001). El peso al inicio del empadre, o experiencia no influyo el ciclo de concepción (P>0.05). La tasa de fertilidad estuvo influenciada por la experiencia sexual (H-CON:96% vs H-SIN:53%) y el peso al inicio del empadre (P<0.001), pero no por la bioestimulación (P>0.05). La tasa reproductiva no estuvo influenciada por la bioestimulación (H-EM:130% vs H-NEM:157%; P<0.05), experiencia sexual (H-CON:157% vs H-SIN:79%), y el peso al inicio del empadre (P<0.001). Se concluye que la experiencia sexual y las hembras más pesadas al momento del empadre fueron más fértiles y prolíficas. La bioestimulación sexual periconcepcional promueve una concepción anticipada.
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