Effect of different chorionic gonadotropins on final growth of the dominant follicle in Bos indicus cows

The aim of this study was to evaluate the effect of eCG or hCG on the final growth of the dominant follicle in Nelore (Bos indicus) cows submitted to fixed-time AI (FTAI). Eighty-four lactating cows with body condition score (BCS) of 2.9 (range 1 –5) were used. At a random day of the estrous cycle (D0) cows received 2 mg estradiol benzoate and a reused intravaginal progesterone device (1.9 g). At D8, when the device was removed, 0.5 mg cloprostenol and 1 mg estradiol cypionate was given i.m., and cows were randomly assigned to rece ive on D8 one of the following treatments: Control (no treatment; n = 17), eCG (300 IU i.m.; n = 17), hCG 300 (300 IU i.m.; n = 18), hCG 200 IM (200 IU i.m.; n = 16) and hCG 200 SC (200 IU s.c.; n = 16).

Source: Theriogenology - February 5, 2018 Category: Genetics & Stem Cells Authors: Alexandre B. Prata, J éssica N. Drum, Leonardo F. Melo, Estela R. Araujo, Roberto Sartori Source Type: research