Follicular dynamics and pregnancy rate in embryo recipient (Bos taurus indicus x Bos taurus taurus) treated with "Ovsynch" protocol for fixed-time embryo transfer

  • Pietro Sampaio Baruselli Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, São Paulo, SP
  • Márcio de Oliveira Marques Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, São Paulo, SP
  • Nelcio Antonio Tonizza de Carvalho Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, São Paulo, SP
  • Rodolfo Cassimiro de Araújo Berber Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, São Paulo, SP
  • Renato Valentim Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, São Paulo, SP
  • Ademário Fernandes de Carvalho Filho Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, São Paulo, SP
  • Waldyr Pinto Costa Neto
Keywords: Progesterone, Pregnancy rate, Embryo recipient, Bovine, Corpus Luteum

Abstract

The aim of this study was to evaluate the efficacy of the synchronization of ovulation for fixed-time embryo transfer in crossbred recipient heifers (Bos taurus indicus x Bos taurus taurus). At Experiment 1, ovarian ultrasonography was performed to evaluate follicular dynamics during the "Ovsynch" protocol (G1; n=35) or single PGF2alpha injection (G2; n=34). At Experiment 2, the same treatments were used at field conditions in 168 (G1) and 177 (G2) heifers. On D6, ovarian ultrasonography and blood collection for P4 assay were performed. On D7, a embryo was transferred. At Experiment 1, 45.7% of the heifers ovulated after the 1st and 74.3% after the 2nd GnRH injection (P;0.05). Thus, the pregnancy rate in Gl was 35.7% and 25.4% in G2 (P<0.05). Estrus was detected in 53.7% of the recipients in G2 and 33.3% in those of the Gl (P<0.05). It was verified that CL with larger area induced an increase on P4 concentration and on the conception rate of both groups (P<0.05). The synchronization of ovulation for fixed-time embryo transfer increased the ovulation, the selection and the pregnancy rates in recipient heifers.

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Published
2003-01-01
How to Cite
Baruselli, P., Marques, M., Carvalho, N., Berber, R., Valentim, R., Carvalho Filho, A., & Costa Neto, W. (2003). Follicular dynamics and pregnancy rate in embryo recipient (Bos taurus indicus x Bos taurus taurus) treated with "Ovsynch&quot; protocol for fixed-time embryo transfer. Brazilian Journal of Veterinary Research and Animal Science, 40(supl.), 96-106. https://doi.org/10.1590/S1413-95962003000800003
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