The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
01/Oct/2008
Vânia Cardoso, Sandra Aidar de Queiroz, Luiz Alberto Fries
DOI: 10.1590/S1516-35982008001000008
The additive and non-additive effects on pre-weaning and post-weaning traits in Hereford x Nelore animals were estimated by multivariate linear regression analyses, including or not the ridge regression procedure. Variance inflation factors (VIF) estimates for all covariates were larger in the analysis without ridge regression. The estimates obtained in this study were used to predict the performances of successive generations of a ½ crossbred Braford population resulting from mating Hereford bulls to Nelore cows. High performance was observed in the […]
Keywords: beef cattle; complementarity; epistasis; epistazygosity; heterosis; ridge regression
01/Jun/2006
Eduardo da Cruz Gouveia Pimentel, Sandra Aidar de Queiroz, Roberto Carvalheiro, Luiz Alberto Fries
DOI: 10.1590/S1516-35982006000400012
The purpose of this study was to compare estimates of genetic effects obtained using the additive-dominance model and another which included parameters for joint-additive (complementarity) and epistatic effects, as well as evaluate alternative objective criteria for choosing the lambda coefficient in ridge regression implementation. The results indicated that the criterion to be employed at the choice of lambda not only depends on the data set and the model used, but also on a previous knowledge about the phenomenon under study […]
Keywords: biased estimation; epistasis; heterosis; multicollinearity; ridge regression