Testosterone concentration in blood serum of buffalo bulls during 24 hours in winter and summer seasons

Authors

  • Valquíria Hyppólito Barnabé Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP.
  • Renato Campanarut Barnabé Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP.
  • Claudio Alvarenga de Oliveira Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP.
  • Maria Lúcia Gambarini Escola de Veterinária de Hannover, Alemanha
  • Maria Carolina Guido Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP.
  • Renato Valentim Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP.

DOI:

https://doi.org/10.11606/issn.1678-4456.bjvras.1994.52110

Keywords:

Testosterone, Serum, Buffaloes

Abstract

Testosterone concentration was measured by radioimmunoassay in 30 samples of blood serum obtained five times at each 6 hour’s interval during 24 hours from 6 Jaffarabadi x Mediterranean buffalo bulls. Blood samplings were carried out twice, respectively, in one day of summer and one day of winter season. Testosterone concentration ranged from 0.10 to 1.36 ng/ml in the winter day and from 0.10 to 2.54 ng/ml in the summer day. Maximum values were obtained at 6:00 p.m. (0.52) in summer and 0.82 ng/ml in winter, then abrupt drops occurred, first at 12 m. (0.37) in summer and 0.21 in winter, and the second one at 24 p.m. (0.17) in summer and 0.49 ng/ml in winter. In summer, higher serum testosterone levels were observed during the day.

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Published

1995-09-03

Issue

Vol. 32 No. 3 (1995)

Section

ANIMAL REPRODUCTION

License

The journal content is authorized under the Creative Commons  BY-NC-SA  license (summary of the license: https://creativecommons.org/licenses/by-nc-sa/4.0 | full text of the license: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode) 

How to Cite

1.
Barnabé VH, Barnabé RC, Oliveira CA de, Gambarini ML, Guido MC, Valentim R. Testosterone concentration in blood serum of buffalo bulls during 24 hours in winter and summer seasons. Braz. J. Vet. Res. Anim. Sci. [Internet]. 1995 Sep. 3 [cited 2025 Mar. 13];32(3):191-3. Available from: https://revistas.usp.br/bjvras/article/view/52110