Animal Reproduction (AR)
https://animal-reproduction.org/article/doi/10.1590/1984-3143-AR2022-0067
Animal Reproduction (AR)
SHORT COMMUNICATION

Does combining estradiol cypionate and GnRH for ovulation induction in recipient cows increase pregnancy rate after timed embryo transfer?

Wagner Marques Lima; Fabiane Pereira de Moraes; Rogério Ferreira; Rafael Gianella Mondadori; Arnaldo Diniz Vieira; Nathália Wacholz Knabah; Danylo Cintra Medeiros Lima; Monique Tomazele Rovani; Luiz Francisco Machado Pfeifer; Paulo Bayard Dias Gonçalves; Bernardo Garziera Gasperin

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Abstract

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.

Keywords

gestation, luteal function, progesterone, synchronization

References

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Submitted date:
07/14/2022

Accepted date:
09/23/2022

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