Selection of Nelore bulls on in vitro production of embryos

Authors

  • Lia de Alencar Coelho Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Departamento de Zootecnia, Pirassununga, SP
  • Cesar Roberto Esper Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Reprodução Animal, Jaboticabal, SP
  • Rafael Herrera Alvarez Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Nova Odessa, SP
  • Roberta Vantini Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Departamento de Zootecnia, Pirassununga, SP
  • Ivo Luiz de Almeida Junior Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Departamento de Zootecnia, Pirassununga, SP

Keywords:

in vitro fertilization, bovine, bull, embryo, cleavage rate

Abstract

This study evaluated the bull effect on the cleavage (CR) and blastocyst rate (BLR) by verifying which of these parameters can be used for selection of semen from Nelore bulls by in vitro production (IVP) of embryos. The immature oocytes from slaughterhouse cows ovaries were matured in vitro in TCM 199 medium with 10% estrous cow serum (ECS), 5µg/ml FSH and 5µg/ml LH. After 24 h of culture, the mature oocytes were incubated with frozen€“thawed semen from 4 Nelore bulls (A, B, C and D), which were submitted to the washing procedure and the sperm concentration adjusted to 5 x 106 cells/ml. The oocytes-sperm incubation lasted 18-21 h and the TALP-IVF supplemented with 30µg/ml heparin was the culture medium used. After this, the oocytes were transferred into microdroplets of Ménezo medium with 10% ECS and bovine oviduct epithelial cells in suspension and were further cultured by 9 days. All the cultures were performed at 38.5°C with 5% CO2 in air and the data were analysed by chi-square test. There was no difference (P>0.05) among the bulls regarding to CR (A= 61.2%; B= 61.3%; C= 66.1%; D= 64.1%). In terms off BLR, bull C (4.1%) was significantly different from bulls A (10.6%), B (12.1%) and C (18.8%), which were not different to each other. The results indicated that the selection of bulls for IVP of bovine embryos should be done by using the blastocyst rate as tile goal.

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Published

2013-12-04

Issue

Section

ANIMAL REPRODUCTION

How to Cite

Selection of Nelore bulls on in vitro production of embryos. (2013). Bulletin of Animal Husbandry, 55(1), 31-36. http://bia.iz.sp.gov.br/index.php/bia/article/view/949

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