Influence of the estrus synchronization protocol and the size of the corpus luteum on the fertility rate in recipients implanted with embryos produced in vitro

  • Ana Carolina Bernardi Mariani UFT, Unidade de Licenciaturas; Laboratório de Biologia EaD
  • Fernando Brito Lopes
  • Juliano Franco Souza BRIO
  • Francisca Elda Ferreira Dias EMVZ, UFT
  • Mônica Arrivabene UFPI
  • José Adalmir Torres Sousa UFPI
  • Gregório Elias Nunes Viana Universidade Federal do Piauí
  • Tânia Vasconcelos Cavalcante Escola de Medicina Veterinária e Zootecnia - Universidade Federal do Tocantins

Abstract

Morphological evaluation of the corpus luteum before embryo transfer is a method commonlyused for the selection of the bovine receptients. The present study evaluated the relation betweenthe corpus luteum and the estrous synchronization protocol on pregnancy rates in recipientsimplanted with in vitro-produced bovine embryos (IVP). 260 crossbred females were selected andsynchronized using two different hormonal protocols: G1 (n=110), with sodium cloprostenol, andG2 (n=150), with norgestomet associated with estradiol benzoate, equine chorionic gonadotrophinand sodium cloprostenol. Corpus luteum (CL) were evaluated on the day of the transfer of theembryos, through rectal palpation, and classified into four types: CL-1 (small), CL-2 (medium), CL-3(large) and CL-4 (enclosed). All transfers were conducted transcervically, in the horn ipsilateral tothe ovary containing the corpus luteum. Pregnancy was confirmed, 30 days after the transfer, byultrasound. The total pregnancy rate was 35,77%, distributed as follows: 17,69% in the recepients withCL-1 (n=46), 30,77% in the recepients with CL-2 (n=80), 43,85% in those with CL-3 (n=114) and 7,69% inrecepients with CL-4 (n=20), resulting in 16 (34,78%), 29 (36,25%), 41 (35,96%) and 7 (35,00%) pregnantfemales, respectively. The results suggest that there is no correlation between corpus luteum sizeand synchronization protocol and the pregnancy rates of bovine recepients implanted with PIVembryos.

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Author Biographies

Ana Carolina Bernardi Mariani, UFT, Unidade de Licenciaturas; Laboratório de Biologia EaD
Médica Veterinária; Mestre em Ciência Animal Tropical
Gregório Elias Nunes Viana, Universidade Federal do Piauí
Departamento de Morfofisiologia Veterinária, Centro de Ciências Agrárias.
Tânia Vasconcelos Cavalcante, Escola de Medicina Veterinária e Zootecnia - Universidade Federal do Tocantins
Professora Associada do Curso de Medicina Veterinária e Zootecnia, EMVZ - UFT, campus de Araguaína. Responsável pela Disciplina Fisiopatologia da Reprodução e Biotecnologias
Published
01-10-2013
How to Cite
Mariani, A. C. B., Lopes, F. B., Souza, J. F., Dias, F. E. F., Arrivabene, M., Sousa, J. A. T., Viana, G. E. N., & Cavalcante, T. V. (2013). Influence of the estrus synchronization protocol and the size of the corpus luteum on the fertility rate in recipients implanted with embryos produced in vitro. Comunicata Scientiae, 4(3), 224-230. https://doi.org/10.14295/cs.v4i3.258
Section
Original Article