Identificação e multiplicação de material genético com maior potencial para maciez de carne em bovinos da raça nelore mocho
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Data
2012-03-01
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Universidade Federal de Goiás
Resumo
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.
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CASTRO, Letícia Mendes de. Characterization and multiplication of genetic material with higher potential for meat tenderness in polled nellore cattle. 2012. 91 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2012.