Sincronización de la ovulación en vacas y utilización de gnrh (hormona liberadora de gonadotropina) en diferentes momentos de la inseminación artificial para mejorar la tasa de concepción

Abstract

The objective of the study was to synchronize the ovulation of crossbred cows and improve the conception rate with the use of GnRH (gonadotropin-releasing hormone) at different times of artificial insemination in the herd of the La Libertad farm in the Pangor community of the parish. Juan de Velasco canton Colta, province of Chimborazo. In a total of 24 experimental units distributed in three treatments, under a Completely Randomized Design (DCA) with eight repetitions each; T0 being: application of GnRH at the time of artificial insemination; T1: application of GnRH 8 hours before artificial insemination and T2: application of GnRH 8 hours after artificial insemination. The results obtained indicate that the Body Condition of the three groups began and finished the trial with equal statistical means; while the observation of heat was in 100% of cows; having a maximum pregnancy percentage for T0 of 75% (6/8 cows) and a minimum in T1 with 25% pregnancy (2/8 cows). The size of the corpus luteum does not report statistical differences between the means, only numerical differences, where T1 had the most significant size at 35 days (28.25 ± 0.35 mm) and at 60 days (31.25 ± 1.77 mm). To know the best treatment by application cost, the pregnant cows are considered since a calf is obtained and the open days are reduced, this is how the best cost was for T0 with %$57.18 for each pregnant cow. It is concluded that synchronizing ovulation with a protocol and using GnRH at the time of insemination can improve the pregnancy percentage and, consequently, the conception rate of crossbred females on the La Libertad farm.