PERIPHERAL LEVELS OF TOTAL TESTOSTERONE IN GUZERAT BULLS

Authors

  • Juliano Cesar Dias Universidade Federal da Fronteira Sul
  • Venício José de Andrade Universidade Federal de Minas Gerais
  • Lucas Luz Emerick
  • Jorge André Matias Martins
  • Vicente Ribeiro do Vale Filho Universidade Federal de Minas Gerais

DOI:

https://doi.org/10.5216/cab.v15i1.5073

Keywords:

Animal Reproduction

Abstract

Twenty-four Guzerat bulls were evaluated from 24 to 34 months of age, aiming to determinate the bulls serum testosterone concentration profile and their variation according to age, body weight and andrologic traits. The average of testosterone concentration was 1.36 ng/mL, with effect of time at harvest on circulating levels. The regression equation of testosterone according to body weight showed linear effect, suggesting that for each kilogram added to the body weight, an increase of 0.0082 ng/mL on serum testosterone concentrations occurs; and the regression of testosterone according to scrotal circumference (SC) also showed a linear effect. The results show that for each centimeter added to SC in Guzerat bulls, an increase of 0.2319 ng/mL on testosterone concentrations occurs. The regression of sperm concentration according to serum testosterone showed a linear effect, the results show that for each 0.1 ng/mL added to serum testosterone concentration, an increase of 9.29x106 spermatozoa/mL of semen occurs. The results indicate that circulating levels of testosterone may help on identification and selection of Guzerat bulls with major reproductive potential.

KEYWORDS: andrology; Guzerat; semen; testosterone; zebu.

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Author Biographies

Juliano Cesar Dias, Universidade Federal da Fronteira Sul

Professor Doutor da Universidade Federal da Fronteira Sul. E-mail: julianocdias@yahoo.com.br. Avenida Oscar Pereira Guedes, no 01, Vila Albert, CEP 85303-820, Laranjeiras do Sul, PR.

Venício José de Andrade, Universidade Federal de Minas Gerais

Professor Titular do Departamento de Zootecnia, PhD, EV - UFMG. E-mail: venicio@vet.ufmg.br.

Lucas Luz Emerick

Aluno de Doutorado, EV - UFMG.Bolsista do CNPq. E-mail: jammvet@gmail.com.

Jorge André Matias Martins

Aluno de Doutorado, EV - UFMG. E-mail: jammvet@gmail.com.

Vicente Ribeiro do Vale Filho, Universidade Federal de Minas Gerais

Professor Titular do Departamento de Clínica e Cirurgia Veterinárias, PhD, EV – UFMG. E-mail: clinica@vet.ufmg.br

Published

2014-03-28

How to Cite

DIAS, J. C.; ANDRADE, V. J. de; EMERICK, L. L.; MARTINS, J. A. M.; VALE FILHO, V. R. do. PERIPHERAL LEVELS OF TOTAL TESTOSTERONE IN GUZERAT BULLS. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 15, n. 1, p. 64–73, 2014. DOI: 10.5216/cab.v15i1.5073. Disponível em: https://revistas.ufg.br/vet/article/view/5073. Acesso em: 21 may. 2024.

Issue

Section

Veterinary Medicine