Does ECG influence the conception rate Nelore cows presenting different body condition scores submitted to the same timed-AI protocol?

Authors

  • Erika Aline Ribeiro Dias Centro Universitário de Rio Preto, Faculdade de Medicina Veterinária, Departamento de Reprodução Animal e Obstetrícia, São José do Rio Preto, SP
  • Rubens Paes de Arruda Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, Laboratório de Biotecnologia do Sêmen e Andrologia, São Paulo, SP
  • Roni Aprecido Videschi Agropecuária Fazenda Brasil, Nova Xavantina, MT
  • Hugo Borges Graff Agropecuária Fazenda Brasil, Nova Xavantina, MT
  • Alessandra de Moraes Sousa Agropecuária Fazenda Brasil, Nova Xavantina, MT
  • Fabio Morato Monteiro Instituto de Zootecnia, Agência Paulista de Tecnologia dos Agronegócios, Secretaria da Agricultura e Abastecimento do Estado de São Paulo, Sertãozinho, SP
  • Enilson Geraldo Ribeiro Instituto de Zootecnia, Agência Paulista de Tecnologia dos Agronegócios, Secretaria da Agricultura e Abastecimento do Estado de São Paulo, Sertãozinho, SP
  • Janaina Torres Carreira Centro Universitário de Rio Preto, Faculdade de Medicina Veterinária, Departamento de Reprodução Animal e Obstetrícia, São José do Rio Preto, SP
  • Halim Atique Netto Centro Universitário de Rio Preto, Faculdade de Medicina Veterinária, Departamento de Reprodução Animal e Obstetrícia, São José do Rio Preto, SP
  • Rogério Fonseca Guimarães Peres Agropecuária Fazenda Brasil, Nova Xavantina, MT
  • Leticia Zoccolaro Oliveira Centro Universitário de Rio Preto, Faculdade de Medicina Veterinária, Departamento de Reprodução Animal e Obstetrícia, São José do Rio Preto, SP

DOI:

https://doi.org/10.17523/bia.v70n3p215

Keywords:

Bos indicus, BCC, fertility, beef cattle

Abstract

The aim of this study was to evaluate the conception rate (CR) of multiparous Nelore cows presenting different body condition scores (BCS), which were submitted to the same Timed-AI protocol with equine chorionic gonadotrophin (eCG). A total of 1574 cows were inseminated, between 40 and 50 days postpartum. During insemination (timed-AI), all data regarding to bull (n=8), inseminator (n=3) and BCS (1 to 5) were recorded. The pregnancy diagnosis was performed, by ultrasonography, 40 days after timed-AI. No effect (P>0.05) of inseminator or bull was observed. No statistical difference was also observed between the groups of animals with different BCS. The animals with lower BCS (Group 1 = BCS 1.5 to 2.0; n = 139) had a CR of 47.4%. The animals with BCS from 2.5 to 2.75 (Group 2; n = 741) and BCS from 3.0 to 3.25 (Group 3; n = 463) had a CR of 47.6% and 51.2%, respectively. The animals with higher BCS (Group 4 = BCS 3.5 to 4.0; n = 231) had a CR of 45.3% (P > 0.05). It was concluded that conception rates were similar between the animals presenting different BCS in the herd, likely because the eCG minimized the effects of low LH pulsatility in animals presenting reduced nutritional condition. However, other studies are recommended to verify the real need of using eCG in animals with body condition exceeding 3.5.

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Published

2013-03-29

Issue

Section

ANIMAL REPRODUCTION

How to Cite

Does ECG influence the conception rate Nelore cows presenting different body condition scores submitted to the same timed-AI protocol?. (2013). Bulletin of Animal Husbandry, 70(3), 215-220. https://doi.org/10.17523/bia.v70n3p215

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