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Ciência Animal Brasileira

On-line version ISSN 1809-6891

Abstract

MUNIZ, Noely Francisca Matos et al. Genetic divergence among Gyr bulls. Ciênc. anim. bras. [online]. 2014, vol.15, n.2, pp.145-151. ISSN 1809-6891.  http://dx.doi.org/10.1590/S1809-68912014000200004.

We studied the genetic divergence among 73 Gyr bulls, through dissimilarity measures, grouping methods and graphic analysis by main components based on the differences expected in its progenies related to productive and reproductive characteristics. The mean Euclidian standardized distances obtained were 4.3743 among the most dissimilar ones and 0.1135 for the most similar ones. Four groups of reproducers with the same similarity were obtained through grouping methods by optimization. The three main components explained 82.01% of the total variance; the first one explained 37.09%, the second one responded by 26.58% and the third one by 18.34% of variance. Scores of the main components enabled the visual evaluation of genetic divergence, through dispersion graphics. The results allowed the identification, among the evaluated animals, of the most divergent ones, recommending that their progenies can be used as mating genitors in improvement programs which aim at producing calves with better performance than their parents.

Keywords : bovines; difference expected in progeny; genetic distance; similarity.

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