Synchronization treatments previous to natural breeding anticipate and improve the pregnancy rate of postpartum primiparous beef cows

Timed AI has become a potential tool to bypass postpartum acyclicity, yet only a small percentage of the world bovine herd is inseminated. Most females are still subjected to bull mating; therefore, the frequent occurrence of postpartum anestrus may compromise their reproductive efficiency. Thus, the aim of this study was to develop an approach that allows the early conception of postpartum primiparous beef cows that are exposed to natural breeding (NB). For this purpose, 350 primiparous Nelore cows 35 –65 d postpartum were allocated into three groups: Control (no hormonal treatment), TNB (hormonal protocol for timed-NB without equine chorionic gonadotropin; eCG) and TNB + eCG (hormonal protocol for TNB with eCG) groups.

Source: Theriogenology - April 4, 2018 Category: Genetics & Stem Cells Authors: R.M. Ferreira, T.L. Conti, R.L. Gon çalves, L.A. Souto, J.N.S. Sales, M.F. Sá Filho, F.M. Elliff, P.S. Baruselli Source Type: research