Identificação e multiplicação de material genético com maior potencial para maciez de carne em bovinos da raça nelore mocho

• Autor(a) principal: CASTRO, Letícia Mendes de
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/891
• topic: avaliações genéticas; carcaça; força de cisalhamento; pedigree; carcass; genetic evaluations; pedigree; shear force; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::PRODUCAO ANIMAL

One of the features that detract Brazilian s beef quality is the lack of tenderness, and that happens because most of their meat comes from Bos indicus animals, known to be less tender than Bos taurus beef. This study was carried out to identify individuals which have higher probabilities to carry meat tenderness genes, as well as mating the progenitors to produce an experimental population to phenotype meat tenderness. The purpose of this study was to analyze the interrelationships among the variables and also to estimate the genetic correlations between meat tenderness feature (WBSF), and growth (PI, PF and GPD) and carcass (EG, P8 and AOL) features. The data were from Guaporé Agropecuária s OB Choice Program. Factor analysis and canonical correlations were used to analyze the phenotypic relationships. The covariance components and genetic parameters were estimated using Gibbs Sampling method. The heritability estimated for shear force trait was of a low magnitude (0.11). Thus, based on the principle of identical genes probability by ancestry to identify individuals which have higher probabilities to carry meat tenderness genes, two segregating populations were formed. A lack of phenotypical correlations between the WBSF trait and the other measured productive traits was also observed. The genetic correlations between WBSF and the other evaluated traits were of a low magnitude, with values of -0.15; -0.18; -0.13; 0.10; -0.12 and 0.18, between WBSF and PI, PF, GPD, EG, P8 and AOL, respectively. The results of this study support the conclusion that tenderness selection will not affect the selection of other economic traits and vice-versa. For a better knowledge of the genetic relationships between WBSF and other traits for Polled Nellore breed more studies are required.