USE OF rbST ON ESTRUS DAY IN RECIPIENTS OF FROZEN BOVINE EMBRYOS

Authors

  • Eduardo P. da Costa Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, Brasil
  • Paulo A. Fernandes Marques Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, Brasil
  • Carlos A.de Carvalho Fernandes Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, Brasil
  • Gustavo Guerino Macedo Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, Brasil
  • Giancarlo Magalhães dos Santos Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, Brasil
  • José R. M. de AlmeidaNeto Centro de Ensino Superior de Valença
  • Emílio C. Martins Pereira Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, Brasil

DOI:

https://doi.org/10.5216/cab.v12i4.8939

Keywords:

Animal Reproduction

Abstract

The aim of this study was to evaluate the effects of the administration of 250 and 500 mg of rbST to bovine recipients of frozen embryos on estrus day on pregnancy rate and on serum progesterone concentration.  In experiment I, 44 recipients were allotted into two treatments: T1(n = 22, control) and T2(n = 22), in which animals received 250 mg rbST subcutaneously.  In experiment II, 71 recipients were allotted in: T1(n = 31, control) and T2(n = 40), in which animals received 500 mg rbST. Pregnancy diagnosis occurred 30 days after estrus. Pregnancy rates did not differ between treatments in both experiments: 40.9%(T1) vs 50.0%(T2) and 48.4%(T1) vs 52.5%(T2) in experiments I and II, respectively. Likewise, the average progesterone concentration (ng/mL plasma) obtained from blood collection samples on the embryo transfer day did not show differences between the treatments: 5.29 ± 0.62(T1) vs. 5.77 ± 0.48(T2) and 4.94 ± 0.54(T1) vs. 4.77 ± 0.51(T2) in experiments I and II, respectively. These results demonstrate that the administration of 250 or 500 mg rbST on estrus day does not increase pregnancy rate nor the serum progesterone concentration of frozen bovine embryo recipients.

KEYWORDS: bovine; embryo recipients; pregnancy rate.

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Published

2011-12-21

How to Cite

COSTA, Eduardo P. da; MARQUES, Paulo A. Fernandes; FERNANDES, Carlos A.de Carvalho; MACEDO, Gustavo Guerino; SANTOS, Giancarlo Magalhães dos; ALMEIDANETO, José R. M. de; PEREIRA, Emílio C. Martins. USE OF rbST ON ESTRUS DAY IN RECIPIENTS OF FROZEN BOVINE EMBRYOS. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 12, n. 4, p. 712–717, 2011. DOI: 10.5216/cab.v12i4.8939. Disponível em: https://revistas.ufg.br/vet/article/view/8939. Acesso em: 6 dec. 2025.

Issue

Vol. 12 No. 4 (2011)

Section

Veterinary Medicine

License

Copyright (c) 2011 Brazilian Animal Science/ Ciência Animal Brasileira

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