J. Anim Sci.
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Journal of Animal Science, Vol 73, Issue 11 3259-3268, Copyright © 1995 by American Society of Animal Science

JOURNAL ARTICLE

Individual multilocus genotypes using microsatellite polymorphisms to permit the analysis of the genetic variability within and between Italian beef cattle breeds

R. Ciampolini, K. Moazami-Goudarzi, D. Vaiman, C. Dillmann, E. Mazzanti, J. L. Foulley, H. Leveziel and D. Cianci
Laboratoire de Genetique Biochimique et Cytoenetique, INRA, Jouy-en-Josas, France.

We investigated the genetic variability within and between cattle breeds. The polymorphisms of 17 microsatellites were studied in 220 unrelated animals belonging to four Italian beef cattle breeds (Chianina, Marchigiana, Romagnola, and Piemontese). Variations of allelic frequencies were examined to characterize the breeds and their relationships. Wahlund coefficients, Polymorphism Information Content values, and Haldane exact test for Hardy-Weinberg proportions were calculated. The results show that the Hardy-Weinberg equilibrium is not always maintained. Moreover, in addition to the classical genetic distances, a new method, based on the consideration of a multilocus genotype of each animal, was set up to measure the genetic similarity between animals or within groups of animals. All the results showed that, whereas Chianina occupies an intermediate position and Piemontese is the most distinct of all four breeds, Marchigiana and Romagnola display the strongest similarity. The new method also provides evidence that average similarities are always higher within breeds than between breeds. By comparing pairwise the multilocus genotypes, it was also possible to discriminate the individuals with higher or lower genetic similarities so that each breed could be subdivided into two groups of animals in relation to their similarity to the average breed multilocus genotype. High similarities between breeds were detected, somewhat surprisingly, when the most homogeneous groups of each breed were compared. The microsatellite multilocus genotype is particularly efficient in evaluating the between- and within-breeds genetic similarities and for subgrouping genetically more homogeneous animals.


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R. Ciampolini, V. Cetica, E. Ciani, E. Mazzanti, X. Fosella, F. Marroni, M. Biagetti, C. Sebastiani, P. Papa, G. Filippini, et al.
Statistical analysis of individual assignment tests among four cattle breeds using fifteen STR loci
J Anim Sci, January 1, 2006; 84(1): 11 - 19.
[Abstract] [Full Text] [PDF]


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Copyright © 1995 by the American Society of Animal Science.