SEASONAL INFLUENCE ON SEMINAL PATTERN AND FREEZABILITY OF PANTANEIRO BULL SEMEN

Authors

  • Nathalia Hack Moreira Universidade de Brasília
  • Eleonora Araújo Barbosa Universidade de Brasília
  • Normandes Vieira Nascimento Embrapa Recursos Genéticos e Biotecnologia
  • Raquel Soares Juliano Embrapa Pantanal
  • Urbano Gomes Pinto de Abreu Embrapa Pantanal
  • Alexandre Floriani Ramos Embrapa Recursos Genéticos e Biotecnologia

DOI:

https://doi.org/10.1590/cab.v17i1.23651

Keywords:

Animal Reproduction

Abstract

The purpose of this paper was to investigate the effect of the season of the year on testicular morphology, fresh and frozen/thawed semen quality from Pantaneiro bulls bred in Brasilia, DF. Six bulls were submitted, once a month for one year, to evaluation of testicular measurements, semen collection using an artificial vagina and cryopreserved with medium containing Tris-based, egg  yolk and glycerol. The testicular length and volume were greater (P < 0.05) in June (11.1±0.8 cm; 652.7±138.0 cm3), July (11.0±0.9 cm; 616.4±156.2 cm3), and September (11.8±0.8 cm; 692.4±141.3 cm3) than October (9.4±1.2 cm; 498.5±154.3 cm3) and November (10.3±1.1 cm; 560.0±111.8 cm3). The sperm concentration was greater (P<0.05) in August (1265.0±436.8 x106sperm/mL) than October, December and January (591.6±192.0, 627.5±314.4; 502.5±172.9 x106/mL). There was no effect   of season on the quality of fresh and frozen semen (motility, vigor, total defects and acrosome integrity) (P > 0.05). In conclusion, Pantaneiro bulls, bred in the Midwest region of Brazil, can be used in natural mating programs in all seasons. Aiming to improve the Brazilian Animal Germplasm Bank with a higher number of samples collected, we suggest that the freezing of the semen is done between June and August, although there will be no losses of semen quality at any time.

Keywords: bovine; conservation; cryopreservation; reproduction; seasonality.

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Author Biographies

Nathalia Hack Moreira, Universidade de Brasília

Médica Veterinária, Mestranda do Programa de Pós-Graduação em Ciencias Animais da Universidade de Brasília

Eleonora Araújo Barbosa, Universidade de Brasília

Médica Veterinária, Mestranda do Programa de Pós-Graduação em Ciencias Animais da Universidade de Brasília

Normandes Vieira Nascimento, Embrapa Recursos Genéticos e Biotecnologia

Engenheiro Agrônomo, Assistente B da Embrapa Recursos Genéticos e Biotecnologia

Raquel Soares Juliano, Embrapa Pantanal

Médica Veterinária, pesquisadora A da Embrapa Pantanal

Urbano Gomes Pinto de Abreu, Embrapa Pantanal

Médico Veterinário, pesquisador A da Embrapa Pantanal

Alexandre Floriani Ramos, Embrapa Recursos Genéticos e Biotecnologia

Médico Veterinário, Pesquisador A da Embrapa Recursos Genéticos e Biotecnologia.

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Published

2016-01-30

How to Cite

MOREIRA, N. H.; BARBOSA, E. A.; NASCIMENTO, N. V.; JULIANO, R. S.; ABREU, U. G. P. de; RAMOS, A. F. SEASONAL INFLUENCE ON SEMINAL PATTERN AND FREEZABILITY OF PANTANEIRO BULL SEMEN. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 17, n. 1, p. 60–69, 2016. DOI: 10.1590/cab.v17i1.23651. Disponível em: https://revistas.ufg.br/vet/article/view/23651. Acesso em: 17 may. 2024.

Issue

Vol. 17 No. 1 (2016)

Section

Animal Production

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