Genetic parameters for body weight, carcass chemical composition and yield in a broiler-layer cross developed for QTL mapping
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Data
2011-01-01
Autores
Nunes, Beatriz do Nascimento [UNESP]
Ramos, Salvador Boccaletti [UNESP]
Savegnago, Rodrigo Pelicioni [UNESP]
Ledur, Mônica Corrêa
Nones, Kátia
Klein, Claudete Hara [UNESP]
Munari, Danísio Prado [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Genética
Resumo
The objective of this study was to estimate genetic and phenotypic correlations of body weight at 6 weeks of age (BW6), as well as final carcass yield, and moisture, protein, fat and ash contents, using data from 3,422 F2 chickens originated from reciprocal cross between a broiler and a layer line. Variance components were estimated by the REML method, using animal models for evaluating random additive genetic and fixed contemporary group (sex, hatch and genetic group) effects. The heritability estimates (h²) for BW6, carcass yield and percentage of carcass moisture were 0.31 ± 0.07, 0.20 ± 0.05 and 0.33 ± 0.07, respectively. The h² for the percentages of protein, fat and ash on a dry matter basis were 0.48 ± 0.09, 0.55 ± 0.10 and 0.36 ± 0.08, respectively. BW6 had a positive genetic correlation with fat percentage in the carcass, but a negative one with protein and ash contents. Carcass yield, thus, appears to have only low genetic association with carcass composition traits. The genetic correlations observed between traits, measured on a dry matter basis, indicated that selection for carcass protein content may favor higher ash content and a lower percentage of carcass fat.
Descrição
Palavras-chave
Broiler, carcass composition, Genetic correlation
Como citar
Genetics and Molecular Biology. Sociedade Brasileira de Genética, v. 34, n. 3, p. 429-434, 2011.