Reproductive performance of Bos indicus beef cows treated with different doses of equine chorionic gonadotropin at the end of a progesterone-estrogen based protocol for fixed-time artificial insemination

Two experiments were performed to evaluate the reproductive performance of zebu beef cows treated with different doses of eCG at the end of a progesterone (P4)/estrogen based protocol for timed artificial insemination (TAI). In Experiment 1, suckling Bos indicus Nelore cows (n=261) received, on day 0, a progesterone (P4) intravaginal device (PD) and an injection of 1 mg estradiol benzoate (EB). On day 8, the PD was removed, 500 μg of cloprostenol was injected, and cows were assigned to one of the following groups: Control (no treatment), 300 (300 IU of eCG), 600 (600 IU of eCG), and 900 (900 IU of eCG).

Source: Theriogenology - June 7, 2018 Category: Genetics & Stem Cells Authors: Rafael Herrera Alvarez, Guilherme Pugliesi, Fabio Luis Nogueira Natal, Cecilia Constantino Rocha, Gilmar Arantes Ataide J únior, Alfredo José Ferreira Melo, Ivani Posar Otzuk, Claudio Alvarenga de Oliveira, Patrice Humblot Source Type: research