Efecto de cópulas posovulación sobre la tasa de sobrevivencia embrionaria en alpacas Huacaya (Vicugna pacos)

Abstract

The study was carried out at the La Raya Experimental Center of the National University of the Altiplano of Puno at an altitude of 4200m, with the aim of evaluating the effect of additional post-ovulation copulations on embryonic survival. Huacaya alpacas were used with postpartum sexual rest greater than 20 days, with a preovulatory follicle greater than 7 mm, verified by ultrasound. For the controlled mating, 5 males from the breeding group were used. After breeding, 26 to 35 hours post-mating, ovulation was verified, selecting 47 alpacas that ovulated, and distributed to the experimental groups: G1 (n = 16) with no additional mating, G2 (n = 15) received an additional mating 24 hours post-ovulation, and G3 (n = 16) two additional mating 48 hours post-ovulation. On days 14 and 24 after copulation, the presence of the corpus luteum and embryonic vesicle was verified by ultrasound and receptivity of the female to the male. Results show a higher percentage of embryo survival trend in alpacas that received additional mating at 24 and 48 h post-ovulation than those that received only one ovulatory mating, showing at 14 days post-copulation an embryonic survival of 93,3% and 87,5%, in G2 and G3 respectively, compared to G1 with 75%, and at 24 days post-copulation 86,7% and 87,5% in G2 and G3 respectively, compared to G1 (62,5%). Although no significant differences were observed between groups (P>0,05), the difference is observed in the simple correspondence analysis between groups.

Efecto de la duración de cópula en la respuesta ovulatoria y tasa de preñez en alpacas

“…Los resultados del presente estudio muestran que no hubo efecto en la tasa de ovulación por el incremento en la duración de la copula mayor a 20 minutos . Fernández Baca et al, (1970) encontró 60% de ovulación en alpacas con una duración de copula de 5 minutos, similar a los resultados de 70-80 % de ovulación reportados por Condorena y Fernández Baca (1972) con una duración de copula de 10 a 25 minutos y de 75 % hallado por Ramos et al, (2020) con una duración mínima de copula de 15 minutos.…”