Efecto de la gonadotropina corionica equina (ECG), sobre la tasa de concepción en vacas Holstein, sincronizadas con prostaglandina y benzoato de estradiol e inseminadas a tiempo fijo.

Abstract

In order to determine the effect of equine chorionic gonadotropin (eCG), on the conception rate in Holstein cows, 50 Holstein females were used, which were found at an age between 3 to 6 years and with a body condition greater than 2 , 5; located in the Chambo canton of the province of Chimborazo; with 2 hormonal treatments: T1 (prostaglandin prostaglandin + estradiol benzoate) and T2 (programmaline prostaglandin + equine chorionic gonadotropin + estradiol benzoate), for the analysis of the results the following experimental measurements were used: ovarian size, dominant follicle, body luteum, mm follicle, conception rate%, early embryonic death% and presence of heat%; the Student t test for paired samples and Chi Square for categorical variables. Cows treated with equine chorionic gonadotropin (eCG), presented a higher conception rate with 84% of pregnant cows, while the group of cows treated with PGF2α + BE reached a conception rate less than 68%; Embryonic death in cows undergoing control treatment was 12%, while applying the equine chorionic gonadotropin hormone (eCG), no embryonic death was recorded (0%). Therefore, the use of 500 IU of prostaglandin and estradiol benzoate is considered. Therefore, the use of equine chorionic gonadotrophin is recommended in synchronization protocols to improve ovulation and fertility in postpartum Holstein cows.