Y cromossome of chianina breed from Brazil

Authors

  • Gilberto Pedroso da Rocha Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Produção e Exploração Animal, Botucatu, SP
  • Wilham Jorge Universidade Federal de Minas Gerais, Departamento de Biologia Geral, Belo Horizonte, MG
  • Rinaldo Polastre Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Melhoramento e Nutrição Animal, Botucatu, SP

DOI:

https://doi.org/10.1590/S1413-95962000000300013

Keywords:

Y chromosome, Bovine, Karyotypes, Chianina

Abstract

There were studied the karyotypes of 95 purebred Chianina bulls, distributed among 19 cattle farms in five Brazilian states. The objective was to investigate the incidence of individuals carring an acrocentric Y chromosome, typical of Bos taurus indicus breeds, in view of speculations that Indian breeds might have contributed to the formation of Chianina. All individual showed the Bos taurus taurus Y chromosome. The centromeric index obtained was 43.91%, which allowed us to classify the centromere of this chromosome as medially located. There were also studied 29 purebred Chianina bulls with the objective of verifying the presence of intraracial polymorphism at the Y chromosome. The centromeric index and relative size of the Y chromosome were determined. The lenght of the X chromosome served as a basis for estimating the relative size of Y. Analysis of variance showed differences among bulls only in the relative size of Y, no differences being detected in the centromeric index. We conclude that this polymorphism indicates the Chianina breed may have received contributions from other breeds in the remote past, or it may also indicate the possibility of more recent crosses.

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Published

2000-01-01

Issue

Section

ZOOTECHNICS

How to Cite

1.
Rocha GP da, Jorge W, Polastre R. Y cromossome of chianina breed from Brazil. Braz. J. Vet. Res. Anim. Sci. [Internet]. 2000 Jan. 1 [cited 2024 Apr. 13];37(3):249-52. Available from: https://www.revistas.usp.br/bjvras/article/view/5823