FOLLICLE DIAMETER AT FIXED-TIME ARTIFICIAL INSEMINATION AND CONCEPTION RATE IN NELLORE COWS

Authors

  • Antonio de L. Ribeiro Filho Universidade Federal da Bahia
  • Priscila Assis Ferraz Universidade Federal da Bahia
  • Alexandra Soares Rodrigues Universidade Federal da Bahia
  • Thereza Cristina B. S. Calmon Bittencourt Universidade Federal da Bahia
  • Marcus Vinícius G. Loiola Universidade Federal da Bahia
  • Marcos Chalhoub Universidade Federal da Bahia

DOI:

https://doi.org/10.5216/cab.v14i4.19678

Keywords:

Animal reproduction

Abstract

The objective of this study was to evaluate the influence of the diameter of the largest follicle at the time of TAI (DFOL) on conception rate of Nellore cows submitted to TAI protocol. Therefore, 348 females were synchronized on day 0 (D0) with an intravaginal progesterone device (P4) associated with 2.0mg of estradiol benzoate intramuscularly (im). On day 8 (D8), after P4 removal, 500?g Sodium cloprostenol (im), 0.6mg of estradiol cypionate (im) and 300UI equine chorionic gonadotropin (eCG) (im) were administered. On day 10 (D10), immediately before each TAI, DFOL was measured in all animals by transrectal ultrasonography. Pregnancy diagnosis was performed 30 days after TAI by transrectal ultrasonography. Data were analyzed by SPSS (version 19) and DFOL means were compared by Student's t-test. The overall conception rate was 57.47% and DFOL overall average was 12.43±2.84mm. There were differences (P=0.0001) in the comparison of DFOL of pregnant (13.33±2.40mm) and nonpregnant (11.27±2.75mm) cows. The results showed a positive effect of DFOL on fertility of cows submitted to synchronization protocol.

KEYWORDS: Artificial insemination; cattle; synchronization.

 

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Author Biographies

Antonio de L. Ribeiro Filho, Universidade Federal da Bahia

Departamento de Patologia e Clínicas

Reprodução Animal

Priscila Assis Ferraz, Universidade Federal da Bahia

Departamento de Patologia e Clínicas

Reprodução Animal

Alexandra Soares Rodrigues, Universidade Federal da Bahia

Departamento de Patologia e Clínicas

Reprodução Animal

Thereza Cristina B. S. Calmon Bittencourt, Universidade Federal da Bahia

Departamento de Produção Animal

Marcus Vinícius G. Loiola, Universidade Federal da Bahia

Departamento de Patologia e Clínicas

Reprodução Animal

Marcos Chalhoub, Universidade Federal da Bahia

Departamento de Patologia e Clínicas

Reprodução Animal

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Published

2013-12-17

How to Cite

RIBEIRO FILHO, A. de L.; FERRAZ, P. A.; RODRIGUES, A. S.; BITTENCOURT, T. C. B. S. C.; LOIOLA, M. V. G.; CHALHOUB, M. FOLLICLE DIAMETER AT FIXED-TIME ARTIFICIAL INSEMINATION AND CONCEPTION RATE IN NELLORE COWS. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 14, n. 4, p. 501–507, 2013. DOI: 10.5216/cab.v14i4.19678. Disponível em: https://revistas.ufg.br/vet/article/view/19678. Acesso em: 19 may. 2024.

Issue

Vol. 14 No. 4 (2013)

Section

Veterinary Medicine

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