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Protein polymorphisms and genetic relationships in Mouro in relation to other breeds of pigs reared in Southern Brazil

Claudia Helena Tagliaro^I; Maria Helena Lartigau Pereira Franco^II; Benito Guimarães de Brito^III

^IDepartamento de Genética, Centro de Ciências Biológicas, Universidade Federal do Pará, 66075-900 Belém, PA, Brasil
^IIDepartamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 15053, 91501-970 Porto Alegre, RS, Brasil. Send correspondence to M.H.L.P.F.
^IIIFundação Instituto Agronômico do Paraná, Laboratório de Microbiologia Animal, Caixa Postal 1331, 86001-970 Londrina, PR, Brasil

ABSTRACT

Fourteen protein systems encoded by 15 structural loci were used to investigate genetic variability in a population of the Mouro swine breed reared in Southern Brazil. The degree of genetic variability obtained for the Mouro animals (He = 0.130) was similar to those estimated for other breeds (Landrace, He = 0.116; Large White, He = 0.119; Duroc, He = 0.095) reared in the same region. This value is also close to those computed for wild pig populations. The gene frequencies at the polymorphic loci were employed to evaluate the usefulness of these systems for paternity identification. The combined probabilities of paternity exclusion were estimated at 58% for Mouro swine. Analysis of genetic relationships revealed that Mouro and Large White samples were the most similar (D = 0.058) and that the Duroc animals were the most dissimilar (D = 0.107). These results suggest that cross-breeding has occurred between Mouro and Large White pigs in Brazil.

Keywords: protein; polymorphisms; Mouro; pigs; Southern Brazil.

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