Parâmetros genéticos de características de carcaça e de qualidade da carne de aves oriundas de cruzamento recíproco
Arquivos
Data
2011-07-08
Autores
Bainy, Adriane Molardi [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
A mais recente preocupação quanto à qualidade da carne de frango está associada a características musculares similares a carne pálida, mole e exsudativa (PSE) verificada em suínos. Carne de frango com características indicativas de PSE pode ser detectada pela combinação dos valores de pH (abaixo de 5,8) e cor (valor L* acima de 52,0) medidos 24 horas post mortem. Neste trabalho, o objetivo foi estimar herdabilidades, correlações genéticas e valores genéticos para características de desempenho corporal; pH aferido 15 minutos (PH15) e 24 horas (PH24) após o abate, medida da luminosidade da carne (L*), da cor vermelha (a*) e da cor amarela da carne (b*) de aves pertencentes à terceira geração do cruzamento recíproco entre uma linhagem de corte e uma de postura, desenvolvidas na Embrapa Suínos e Aves, em Concórdia, SC. Com o intuito de caracterizar a variabilidade dos valores genéticos dos animais para as características estudadas, estes foram submetidos à análise exploratória, utilizando técnicas estatísticas multivariadas de agrupamento hierárquico e não hierárquico (k-means) e análise de fatores. Os parâmetros genéticos foram estimados pelo método de máxima verossimilhança restrita. As estimativas de herdabilidade para as medidas de cor (L*, a* e b*) e pH indicaram que grande parte da variância fenotípica destas características pode ser atribuída aos efeitos não aditivos dos genes e ao ambiente, e, conseqüentemente, que a seleção para estas características não seria eficiente. O PH15 e L* apresentaram associação genética moderada com peso corporal, dessa forma, animais selecionados para peso corporal podem apresentar fenótipo de carne PSE, devido à redução do pH e ao aumento da palidez da carne. Não foi observada associação genética entre L* e as medidas a* e b*. Pela análise de agrupamento hierárquico pôde-se perceber a formação de...
The most recent concern about the quality of chicken meat is associated with characteristics similar to pale, soft and exudative meat (PSE) found in pigs. Chicken meat with PSE’s characteristics can be detected by the combination of pH values (below 5.8) and color (L * value greater than 52.0) measured 24 hours post mortem. The objective of this research was to estimate heritabilities, genetic correlations and breeding values for body weight (WT), carcass traits, pH measured at 15 minutes (PH15) and at 24 hours (PH24) after slaughter, measurements of brightness (L*), red color (a*) and yellow color (b*) of the poultry meat belonging to the third generation of a reciprocal cross between a meat and a posture line developed at Embrapa Suínos e Aves, Concórdia, SC. In order to evaluate the breeding values variability of traits, these estimates were submitted to exploratory analysis, using multivariate statistical techniques of clustering, k-means and factor analysis. The estimation of the genetic parameters was performed using restricted maximum likelihood method. The heritability estimates for measures of color (L*, a* and b*) and pH indicated that much of the phenotypic variance of these traits can be attributed to non-additive effects of genes and environment. Therefore the selection for these traits would not be considered efficient. The PH15 and L* were moderate genetic correlated with body weight. Consequently animals selected for body weight may have phenotype of PSE meat due to reduced pH and paler meat. No genetic association was found between L* and a* and b* measures. The cluster analysis showed the formation of four distinct groups in the studied population in relation to the breeding values. In factor analysis, four factors were taken into account. The first factor included the performance body traits, which is responsible for 51.26% of the total variation of breeding values ... (Complete abstract click electronic access below)
The most recent concern about the quality of chicken meat is associated with characteristics similar to pale, soft and exudative meat (PSE) found in pigs. Chicken meat with PSE’s characteristics can be detected by the combination of pH values (below 5.8) and color (L * value greater than 52.0) measured 24 hours post mortem. The objective of this research was to estimate heritabilities, genetic correlations and breeding values for body weight (WT), carcass traits, pH measured at 15 minutes (PH15) and at 24 hours (PH24) after slaughter, measurements of brightness (L*), red color (a*) and yellow color (b*) of the poultry meat belonging to the third generation of a reciprocal cross between a meat and a posture line developed at Embrapa Suínos e Aves, Concórdia, SC. In order to evaluate the breeding values variability of traits, these estimates were submitted to exploratory analysis, using multivariate statistical techniques of clustering, k-means and factor analysis. The estimation of the genetic parameters was performed using restricted maximum likelihood method. The heritability estimates for measures of color (L*, a* and b*) and pH indicated that much of the phenotypic variance of these traits can be attributed to non-additive effects of genes and environment. Therefore the selection for these traits would not be considered efficient. The PH15 and L* were moderate genetic correlated with body weight. Consequently animals selected for body weight may have phenotype of PSE meat due to reduced pH and paler meat. No genetic association was found between L* and a* and b* measures. The cluster analysis showed the formation of four distinct groups in the studied population in relation to the breeding values. In factor analysis, four factors were taken into account. The first factor included the performance body traits, which is responsible for 51.26% of the total variation of breeding values ... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Frango de corte, Carne - Qualidade, Correlação genética, Poultry, Meat quality, pH, Color, Genetic correlation
Como citar
BAINY, Adriane Molardi. Parâmetros genéticos de características de carcaça e de qualidade da carne de aves oriundas de cruzamento recíproco. 2011. vii, 56 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2011.