Does combining estradiol cypionate and GnRH for ovulation induction in recipient cows increase pregnancy rate after timed embryo transfer?
2022
Lima, Wagner Marques de | Moraes, Fabiane Pereira de | Ferreira, Rogério | Mondadori, Rafael Gianella | Vieira, Arnaldo Diniz | Knabah, Nathália Wacholz | Lima, Danylo Cintra Medeiros | Rovani, Monique Tomazele | Pfeifer, Luiz Francisco Machado | Goncalves, Paulo Bayard Dias | Gasperin, Bernardo Garziera
Estradiol cypionate (EC) or GnRH have been widely used for ovulation induction in timed embryo transfer (TET). EC administration increases the proportion of cows that show estrus, whereas GnRH promotes more synchronized ovulations. The aim of the present study was to evaluate the potential beneficial effects of combining EC and GnRH in TET. In experiment 1, no difference was observed on serum progesterone concentrations on Day 6 and 13 after GnRH treatment between GnRH and EC+GnRH groups. In experiment 2, pregnancy per embryo transfer (P/ET) did not differ (p = 0.69) between GnRH (62.8%) and EC+GnRH (58.7%) groups. In conclusion, combining EC and GnRH for ovulation induction does not increase progesterone secretion and pregnancy rate after TET in cattle.
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