THE EFFECT OF THE INTENSITY OF ESTRUS EXPRESSION ON THE FOLLICULAR DIAMETER AND FERTILITY OF NELLORE COWS MANAGED UNDER A FTAI PROGRAM

Authors

  • Priscila Assis Ferraz Universidade Federal da Bahia
  • Marcus Vinicius Galvão Loiola Universidade Federal da Bahia
  • Alexandra Soares Rodrigues Univeridade Federal do Oeste da Bahia
  • Marcos Chalhoub Coelho Lima Universidade Federal da Bahia
  • Thereza Cristina Borio dos Santos Calmon de Bittencourt Universidade Federal da Bahia
  • Antonio de Lisboa Ribeiro Filho Universidade Federal da Bahia

DOI:

https://doi.org/10.1590/cab18037643

Keywords:

Animal Reproduction

Abstract

The aim of this study was to determine the relationship between the intensity of estrus expression on the ovulatory follicle diameter (OFD) and its effect on the conception rate in zebu females managed under a FTAI program. On a random day of the estrous cycle, day 0, 308 Nellore females received an intravaginal progesterone device and 2.0 mg of estradiol benzoate were administered intramuscularly (IM). On day 8, the progesterone device was removed, and 300 IU of equine chorionic gonadotropin, 150 ?g of d-cloprostenol, and 1.0 mg of estradiol cypionate were administered IM. The animals were then painted with animal marker spray between the sacral tuberosity and the tailhead. On day 10, the animals were categorized into three groups: no estrus expression (n = 78), low intensity of estrus expression (n = 66) and high intensity of estrus expression (n = 164). The OFD was then measured, and artificial insemination (AI) was performed. The results suggest that determining the intensity of estrus expression is a good parameter to identify females with greater follicular diameter and increased fertility in Nellore cows submitted to a FTAI protocol.
Keywords: artificial insemination; estrus detection; Nellore.

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Author Biographies

Priscila Assis Ferraz, Universidade Federal da Bahia

Médica Veterinária, Mestre em Ciência Animal nos Trópicos, Doutoranda do Programa Ciência Animal nos Trópicos, Universidade Federal da Bahia

Marcus Vinicius Galvão Loiola, Universidade Federal da Bahia

Médico Veterinário, Mestre em Ciência Animal nos Trópicos, Doutorando do Programa Ciência Animal nos Trópicos, Universidade Federal da Bahia

Alexandra Soares Rodrigues, Univeridade Federal do Oeste da Bahia

Médica Veterinária, Docente da Universidade Federal do Oeste da Bahia

Marcos Chalhoub Coelho Lima, Universidade Federal da Bahia

Médico Veterinário, Docente da Universidade Federal da Bahia, Departamento de Anatomia e Clínicas, área da Fisipatologia da Reprodução Animal e Obstetricia Veterinária

Thereza Cristina Borio dos Santos Calmon de Bittencourt, Universidade Federal da Bahia

Médica Veterinária, Docente da Universidade Federal da Bahia, Departamento de Produção Animal

Antonio de Lisboa Ribeiro Filho, Universidade Federal da Bahia

Médico Veterinário, Docente da Universidade Federal da Bahia, Departamento de Anatomia e Clínicas, área da Fisipatologia da Reprodução Animal

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Published

2017-03-03

How to Cite

FERRAZ, P. A.; LOIOLA, M. V. G.; RODRIGUES, A. S.; LIMA, M. C. C.; BITTENCOURT, T. C. B. dos S. C. de; RIBEIRO FILHO, A. de L. THE EFFECT OF THE INTENSITY OF ESTRUS EXPRESSION ON THE FOLLICULAR DIAMETER AND FERTILITY OF NELLORE COWS MANAGED UNDER A FTAI PROGRAM. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 18, 2017. DOI: 10.1590/cab18037643. Disponível em: https://revistas.ufg.br/vet/article/view/e-37643. Acesso em: 17 jul. 2024.

Issue

Vol. 18 (2017): Continuous publication

Section

ZOOTECNIA

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