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Journal of Heredity Advance Access originally published online on June 22, 2006
Journal of Heredity 2006 97(4):331-339; doi:10.1093/jhered/esl003
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© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Genetic Characterization of Argentine and Bolivian Creole Cattle Breeds Assessed through Microsatellites

Juan Pedro Lirón, Pilar Peral-García, and Guillermo Giovambattista

From the Centro de Investigaciones en Genética Básica y Aplicada, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, 60 y 118 s/n, CC296, B1900AVW La Plata, Argentina

Address correspondence to J. P. Lirón at the address above, or e-mail: juanpedroliron{at}gmail.com.

In the present report, the polymorphisms from 9 microsatellites were used to assess genetic diversity and relationships in 4 Creole cattle breeds from Argentina and Bolivia, 4 European taurine breeds, and 2 American zebu populations. The Creole populations display a relatively high level of genetic variation as estimated by allelic diversity and heterozygosity, whereas the British breeds displayed reduced levels of genetic diversity. The analysis of molecular variance indicated that 7.8% of variance can be explained by differences among taurine and zebu breeds. Consistent with these results, the first principal component (PC), which comprised the 40% of the total variance, clearly distinguishes these 2 groups. In addition, all constructed phylogenetic trees cluster together Nelore and Brahman breeds with robust bootstrap values. Only 1% of variance was due to difference between American Creole and European taurine cattle. Although this secondary split was supported by the classical genetic distance and the second PC (15%), the topology of trees is not particularly robust. The presence of zebu-specific alleles in Creole cattle allowed estimating a moderate degree of zebu admixture. When these data were compared with mitochondrial and Y chromosomal studies, a clearl pattern of male-mediated introgression was revealed. The results presented here contribute to the understanding of origin and history of the American Creole cattle.


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