Genetic parameters for body weight, carcass chemical composition and yield in a broiler-layer cross developed for QTL mapping

Genetics and Molecular Biology

Beatriz Do Nascimento Nunes²  Salvador Boccaletti Ramos²  Rodrigo Pelicioni Savegnago²  Mônica Corrêa Ledur¹  Kátia Nones¹  Claudete Hara Klein²  Danísio Prado Munari² 

[1] ,Universidade Estadual Paulista Faculdade de Ciências Agrárias e Veterinárias Departamento de Ciências ExatasJaboticabal SP ,Brazil

关键词: broiler;    carcass composition;    genetic correlation;   

DOI  :  10.1590/S1415-47572011005000019

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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