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/Dec/2003
Marcelo Hessel Van Melis, Joanir Pereira Eler, Josineudson Augusto II de Vasconcelos Silva, José Bento Sterman Ferraz
DOI: 10.1590/S1516-35982003000700011
The objective of this paper was to compare the estimates of genetic parameters obtained by REML and method Â. Animal model single-trait analyses were performed using a data set of Nellore cattle. Statistical models included fixed effects of contemporary group (herd, year, sex and management groups at weaning and 550 days) and age of animal (covariable-linear effect), and additive genetic and residual random effects. Heritability estimates were 0.36 and 0.39 for weight at 550 days (W550); 0.27 and 0.29 for […]
Keywords: genetic parameters; growth traits; method Â; Nellore; repeatability model; visual score
01/Oct/2003
Josineudson Augusto II de Vasconcelos Silva, Marcelo Hessel Van Melis, Joanir Pereira Eler, José Bento Sterman Ferraz
DOI: 10.1590/S1516-35982003000500014
Records of 24,703 Nelore cattle from six herds were used to estimate coefficients of heritability for probability of pregnancy at 14 months (PP14) and hip height (HH) traits. For PP14, the mathematical model included as fixed effects the contemporary groups (181 groups) and dam age class at calving (7 classes) and for HH only contemporary groups (584 groups). Random effects included were genetic additive of sire and residual effects. Variance and covariance components were obtained by method Â. Heritability estimates […]
Keywords: genetic correlation; heritability; hip height; method Â; probability of pregnancy at 14 months