Carcass yield

Comparison of different models to estimate genetic parameters for carcass traits in a commercial broiler line

J. L. B. M. Grosso, Balieiro, J. C. C., Eler, J. P., Ferraz, J. B. S., Mattos, E. C., and T. Filho, M., Comparison of different models to estimate genetic parameters for carcass traits in a commercial broiler line, vol. 9, pp. 908-918, 2010.

The effect of genetic and non-genetic factors for carcass, breast meat and leg weights, and yields of a commercial broiler line were investigated using the restricted maximum likelihood method, considering four different animal models, including or excluding maternal genetic effect with covariance between direct and maternal genetic effects, and maternal permanent environmental effect. The likelihood ratio test was used to determine the most adequate model for each trait.

Estimates of genetic trend for carcass traits in a commercial broiler line

J. L. B. M. Grosso, Balieiro, J. C. C., Eler, J. P., Ferraz, J. B. S., Mattos, E. C., T. Filho, M., Felício, A. M., and Rezende, F. M., Estimates of genetic trend for carcass traits in a commercial broiler line, vol. 8, pp. 97-104, 2009.

Data from the slaughter of 24,001 chickens that were part of a selection program for the production of commercial broilers were used to estimate genetic trend for absolute carcass (CW), breast meat (BRW), and leg (LW) weights, and relative carcass (CY), breast meat (BRY), and leg (LY) weights. The components of (co)variance and breeding values of individuals were obtained by the restricted maximum likelihood method applied to animal models. The relationship matrix was composed of 132,442 birds.

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