Nucleolus organizer regions in buffaloes of Murrah, Jafarabadi and Mediterranean breeds, from the State of São Paulo

Authors

  • Rita Maria Ladeira Pires Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Nova Odessa, SP
  • Benedicto do Espírito Santo de Campos Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Nova Odessa, SP
  • Sanae Kasahara Universidade Estadual Paulista, Instituto de Biociências, Departamento de Biologia, Botucatu, SP

Keywords:

buffalo cytogenetics, chromosome, nucleolus organizer regions, NORs

Abstract

The nucleolus organizer regions (NORs) were studied in 50 river buffaloes (2n = 50), from the State of São Paulo, being 19 Murrah, 17 Jafarabadi and 14 Mediterranean. In the three breeds, NORs were located in six chromosome pairs, on the telomeric regions identified as 3p, 4p, 8q, 21q, 23q, and 24q. The mean numbers of NORs per cell were not significantly different (p > 0.01) among each breed of buffaloes. Several types of NORs associations occurred and the most frequently observed involved two NORs located in acrocentric chromosomes. The correlation coefficient between the number of NORs and the number of associations was statistically signifícant (p < 0.01) for each breed. The animais of the three breeds showed predominantly the +/- NOR pattern for the pairs 3, 4 and 8, that is, only one of the homologues of each pair exhibited genetically active NOR. The frequency of NORs was highest for pair 3 and lowest for pair 8, in the Mediterranean and Jafarabadi breeds, while in Murrah, it was highest for one of the small acrocentric and lowest for pair 4.

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Published

2013-12-05

Issue

Section

ANIMAL REPRODUCTION

How to Cite

Nucleolus organizer regions in buffaloes of Murrah, Jafarabadi and Mediterranean breeds, from the State of São Paulo. (2013). Bulletin of Animal Husbandry, 54(1), 39-48. http://35.198.24.243/index.php/bia/article/view/974

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