Pregnancy rate of recipient cows with different degrees of embryo-uterine asynchrony

Authors

  • Raquel Rodrigues Costa Mello Universidade Federal Rural do Rio de Janeiro, Departamento de Reprodução e Avaliação Animal, Instituto de Zootecnia, Seropédica, RJ
  • Matheus Elias de Oliveira Morais Faculdade de Jaguariúna, Escola de Veterinária, Jaguariúna, SP
  • Joaquim Esquerdo Ferreira Universidade Federal Rural do Rio de Janeiro, Departamento de Reprodução e Avaliação Animal, Instituto de Zootecnia, Seropédica, RJ
  • Marco Roberto Bourg Mello Universidade Federal Rural do Rio de Janeiro, Departamento de Reprodução e Avaliação Animal, Instituto de Zootecnia, Seropédica, RJ

DOI:

https://doi.org/10.17523/bia.v73n1p88

Keywords:

in vitro production, asynchrony, pregnancy.

Abstract

The objective of this study was to evaluate the effect of the degree of embryo-uterine asynchrony on the pregnancy rate of recipients after transfer of in vitro-produced bovine embryos. Data from 335 crossbred recipient heifers provided by the company Minerembryo, Alfenas, MG, were used. The animals were divided into three groups according to the degree of asynchrony: asynchrony -1: estrus of the recipient occurred one day before follicular aspiration (group I, n=106); synchrony 0: estrus of the recipient occurred on the day of follicular aspiration (group II, n=119), and asynchrony +1: estrus of the recipient occurred one day after follicular aspiration (group III, n=110). The results were analyzed by the chi-squared test, adopting a level of significance of 5%. The pregnancy rates were 34.9, 35.29 and 33.63% for groups I, II and III, respectively. There was no effect (P=0.98) of the degree of asynchrony on pregnancy rate. It can thus be concluded that the use of recipients with a higher degree of asynchrony is feasible, improving the utilization of these animals in programs of in vitro production of bovine embryos. 

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Published

2016-03-31

Issue

Section

ANIMAL REPRODUCTION

How to Cite

Pregnancy rate of recipient cows with different degrees of embryo-uterine asynchrony. (2016). Bulletin of Animal Husbandry, 73(1), 88-93. https://doi.org/10.17523/bia.v73n1p88

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