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Biochemical polymorphisms and genetic relationships among landrace, large white and duroc pigs from southern Brazil

Claudia Helena Tagliaro^I; Maria Helena Lartigau Pereira Franco^II; Werner Meincke^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.
^IIIAssociação dos Criadores de Suinos do Rio Grande do Sul, Caixa Postal 112, 95880-000 Estrela, RS, Brasil

ABSTRACT

Fourteen protein systems encoded by 15 structural loci were used to investigate genetic variability in three swine breeds (Landrace, Large White and Duroc), reared in Southern Brazil. The degree of genetic variability was similar in the three breeds (Landrace, He = 0.116; Large White, He = 0.119; Duroc, He = 0.095). These values are close to those computed for other populations of these breeds and higher than those obtained for wild pig populations. The gene frequencies at the polymorphic loci were employed to evaluate the usefulness of these systems for parent identification. The combined probabilities of paternity exclusion were estimated at 59% for Landrace, 54% for Large White and 50% for Duroc animals. Analysis of genetic relationships revealed that Landrace and Large White are the most similar breeds (D = 0.044), while the Duroc breed presents lower levels of genetic similarity to the other two breeds (Landrace/Duroc: D = 0.084; Large White/Duroc: D = 0.106). These findings are in agreement with the historical development of these breeds.

Keywords: biochemical; polymorphisms; genetic relationships; landrace pigs; large white pigs; duroc pigs.

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