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Genetic parameters for performance and carcass traits in a paternal 1 lineage of broiler.

Cruz, Valdecy A R; Grupioni, Natalia V; Mendonça, Gabriela G; Venturini, Guilherme C; Ledur, Monica C; Peixoto, Jane O; Munari, Danisio P.
An Acad Bras Cienc; 92 Suppl 1: e20180697, 2020.
Inglês | MEDLINE | ID: mdl-32348410
The objective of this study was to estimate variance components for performance and carcass traits in a paternal broiler line. The (co)variance components were estimated by the restricted maximum likelihood method applied to the animal model, including the fixed effect of group (sex and hatch) and additive genetic and residual as random effects. Estimated heritability for performance traits ranged from 0.09 to 0.42. The genetic correlations between traits ranged from -0.50 to 0.97. The heritability estimates of feed intake, weight gain, and feed conversion from 35 to 41 days of age were of low magnitude. The genetic correlations among them were favorable to genetic selection. These results suggest that moderate genetic gain can be obtained to the feed intake and weight gain when the selection criterion is the body weight and prime cuts traits. The feed conversion that had low heritability estimation and low genetic correlation with the body weight and prime cut traits needs to pay greater attention due to the economic importance in the high-meat production lineage breeding programs.