Genetic structure of the registred polled gir breed in Brazil

Authors

  • Fábio José Carvalho Faria Universidade Federal de Mato Grosso do Sul, Departamento de Zootecnia, Campo Grande, MS
  • Anibal Eugênio Vercesi Filho Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Polo Regional de Desenvolvimento Tecnológico dos Agronegócios do Nordeste Paulista, Mococa, SP
  • Fernando Enrique Madalena Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Zootecnia, Belo Horizonte, MG
  • Luiz Antônio Josahkian Associação Brasileira dos Criadores de Zebu, Uberaba, MG

Keywords:

Inbreeding, Polled Gir, effective population size, genetic variability

Abstract

Using pedigree records of the Polled Gir animals in Brazil born between 1976 and 1998, the inbreeding and effective population size were calculated and genetic variability was determined by parameters based on probabilities of gene origin. The data file was separated in the following periods: 1979-1983, 1984-1988, 1989-1993 e 1994-1998. The total inbreeding increased from 0.22% to 3.06%, the expected inbreeding under random mating increased from 0.07% to 1.54% and the inbreeding due to population subdivision increased from 0.14% to 1.54%, indicating that genetic subdivision in this population is relevant. The effective population size was estimated from the total inbreeding and decreased from 229 to 24. Based on the probabilities of gene origin the effective number of founders, ancestries and remaining genomes decreased over the periods, reaching values of 29, 28 and 19. The results of this study indicate the need for active management to increase genetic variability for conservation and breeding purposes.

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Published

2013-11-26

Issue

Section

GENETIC

How to Cite

Genetic structure of the registred polled gir breed in Brazil. (2013). Bulletin of Animal Husbandry, 63(3), 135-141. http://bia.iz.sp.gov.br/index.php/bia/article/view/1262

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