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Arquivo Brasileiro de Medicina Veterinária e Zootecnia

On-line version ISSN 1678-4162

Abstract

VELOSO, R. C. et al. Genetic divergence between genotypes of alternative strain of broiler chickens. Arq. Bras. Med. Vet. Zootec. [online]. 2015, vol.67, n.5, pp.1353-1360. ISSN 1678-4162.  http://dx.doi.org/10.1590/1678-4162-7351.

ABSTRACT

The aim of this study was to evaluate the genetic divergence among seven genotypes of alternative strain of broiler chickens of the Redbro strain using the performance characteristics using multivariate analysis. We used 840 day old male chicks, distributed in a completely randomized design, with the following genotypes: Caboclo, Carijó, Colorpak, Gigante Negro, Pesadão Vermelho, Pescoço Pelado and Tricolor. After the consistency of the data, the following variables were analyzed: average daily gain, average daily feed intake and feed conversion for the periods: 1 to 28, 1 to 56, 1 to 70 and 1 to 84 days of age, body weight at birth, at 28, 56, 70 and at 84 days old. The performance of genotypes was assessed by multivariate analysis of variance and Fisher's linear discriminant function, using the tests of the largest eigenvalue of Roy and the Roy union-intersection for multiple comparisons. The study of genetic diversity was done by canonical variate analysis and the method of Tocher. The genotypes Caboclo and Gigante Negro had different canonical averages from the other genotypes. The first two canonical variables accounted for 97.41% of the variation among genotypes. The genetic divergence between the genotypes allowed the formation of four groups with the following genotypes: group 1 - Colorpak, group 2 - Pesadão Vermelho and Pescoço Pelado; group 3 - Carijó and Tricolor, and group 4 - Caboclo and Gigante Negro.

Keywords : canonical variable; discriminant analysis; distance; group.

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