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| Lorentz,Leandro Homrich; Gaya,Leila de Genova; Lunedo,Raquel; Ferraz,José Bento Sterman; Rezende,Fernanda Marcondes de; Michelan Filho,Tércio. |
| Breast weight has great economic importance in poultry industry, and may be associated with other variables. This work aimed to estimate phenotypic correlations between performance (live body weight at 7 and 28 days, and at slaughter, and depth of the breast muscle measured by ultrasonography), carcass (eviscerated body weight and leg weight) and body composition (heart, liver and abdominal fat weight) traits in a broiler line, and quantify the direct and indirect influence of these traits on breast weight. Path analysis was used by expanding the matrix of partial correlation in coefficients which give the direct influence of one trait on another, regardless the effect of the other traits. The simultaneous maintenance of live body weight at slaughter and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal breeding; Multivariate analysis; Phenotypic correlation; Poultry; Pre-selection. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300008 |
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| Gaya,Leila de Genova; Mourão,Gerson Barreto; Ferraz,José Bento Sterman; Mattos,Elisângela Chicaroni de; Costa,Andrezza Marcovig Moreira Alves da; Michelan Filho,Tércio; Rosa,Alessandra Fernandes; Felício,Andrezza Maria; Eler,Joanir Pereira. |
| Broiler meat quality is one of the primary factors considered by the poultry industry. This study was conducted to estimate heritability and genetic correlation coefficients for meat quality traits in a single male broiler line. The meat ultimate pH (24 h after slaughter) and lightness presented the highest heritability estimates. Given the estimated genetic correlations, the pH measured at 15 min and 24 h after slaughtering, as well as lightness, were characterized by a close and negative genetic relationship with water holding capacity traits. In contrast, meat quality traits exhibited only non-significant genetic correlations with performance and carcass traits. Noticed exceptions were breast weight, which was genetically and favorably associated with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal breeding; Genetic parameters; Poultry. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600002 |
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| Paiva,José Teodoro de; Mourão,Gerson Barreto; Ferraz,José Bento Sterman; Mattos,Elisângela Chicaroni; Michelan Filho,Tércio; Campos,Bárbara Machado; Eler,Joanir Pereira; Gaya,Leila de Genova. |
| ABSTRACT: The intense selection process for economic traits conducted by the poultry breeding programs has been caused several changes in broiler meat quality. A database belonging to a selection program of a broiler male line was used to estimate heritability and genetic correlations for feed conversion ratio and meat quality traits, which were: initial and final pH, lightness, drip loss, thawing loss and shear force. Two-trait analyses were performed and the components of co(variance) and genetic parameters were determined using the Bayesian approach and the GIBBS3F90 software. The heritability estimate found for feed conversion ratio (0.52) showed high influence of direct additive genetic effects on the expression of this trait; therefore, this trait is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bayesian inference; Animal breeding; Genetic correlation; Indirect selection. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200129 |
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| Silva,Luana Bertollini de Jesus; Gaya,Leila de Genova; Madureira,Ana Paula; Tarôco,Graziela; Ferraz,José Bento Sterman; Mourão,Gerson Barreto; Mattos,Elisângela Chicaroni de; Michelan Filho,Tércio. |
| The goals of this research were to estimate the phenotypic correlations among various meat quality traits from a male broiler line and to describe the relation among these variables. Phenotypical correlations were determined among quality traits, isolating the effects of slaughter date, the age of the mother and sex. The evaluated traits were pH measurements taken at time 0 and at 6 and 24 hours after slaughtering, color parameters, water loss due to exudation, thawing and cooking of the meat, and shear force. Important associations (P<0.01) were found to be significant and, in most cases, weak or moderate, varying from -0.35 to 0.28. The initial pH of the meat was not associated (P>0.05) to the other traits of the meat, whereas the pH at 24... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Correlation; Pectoralis major; PH; Poultry. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000800029 |
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| Gaya,Leila de Genova; Ferraz,José Bento Sterman. |
| O estudo dos parâmetros genéticos das características de qualidade de carne de aves permite à industria avícola se adequar às exigências da indústria processadora, aumentando sua eficiência, e melhorando a aceitação da carne de frango pelo mercado consumidor. Além disso, por meio do estudo destes parâmetros, valiosas informações sobre a caracterização do fenômeno denominado PSE, que representa a carne pálida, flácida e exsudativa, podem ser obtidas, uma vez que são escassos os estudos a esse respeito em frangos. O conhecimento do comportamento genético e da relação entre os atributos da carne e outras características de interesse em frangos de corte pode favorecer o estabelecimento mais preciso e adequado das estratégias utilizadas nos programas de seleção. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Frangos; Melhoramento genético; Parâmetros genéticos; PSE; Qualidade da carne. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782006000100058 |
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| Gaya,Leila de Genova; Mourão,Gerson Barreto; Ferraz,José Bento Sterman. |
| Os parâmetros genéticos são ferramentas importantes para se conhecer melhor as características utilizadas nos programas de melhoramento genético e para a avaliação do plano de seleção empregado, permitindo o direcionamento das estratégias a serem aplicadas. As características de desempenho e de carcaça vêm sendo utilizadas como critério durante a seleção genética dos frangos, a exemplo do peso vivo, do peso de peito e da conversão alimentar. Entretanto, algumas características de composição corporal vêm trazendo entraves para a produção e a indústria avícolas, especialmente o peso da gordura e o peso do coração. Assim, nesta revisão, são abordados os principais aspectos relacionados aos parâmetros genéticos das características de desempenho, de carcaça e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Correlação genética; Gordura abdominal; Herdabilidade; Melhoramento genético. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782006000200058 |
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