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/Jun/2006
Fabiana Batalha Knackfuss, Alexander George Razook, Maria Eugênia Zerlotti Mercadante, Joslaine Noely dos Santos Gonçalves Cyrillo, Leopoldo Andrade de Figueiredo, Humberto Tonhati
DOI: 10.1590/S1516-35982006000300012
Selection for yearling weight has been applied in a herd of Gir breed (80 cows, 6 sires) since 1976 and a Nelore Control herd (60 cows, 4 sires) has been used to evaluate the environmental change. Selection criteria were bull weight at 378 days (P378) in a performance test and heifer weight at 550 days (P550), under grazing conditions. The effective midparent selection differentials for P378 and P550 were 19.5 and 1.8 kg respectively for Gir and NeC, corresponding to […]
Keywords: beef cattle; control population; generation coefficient; genetic change; selection intensity
01/Oct/2003
Maria Eugênia Zerlotti Mercadante, Irineu Umberto Packer, Alexander George Razook, Joslaine Noely dos Santos Gonçalves Cyrillo
DOI: 10.1590/S1516-35982003000500012
Records of body weight at selection of Nelore cattle pertaining to the Sertãozinho’s Experimental Station (SP-Brasil) Nelore herds were used to study the influence of the incorporation of additional information on the estimation of annual genetic trend by least squares and mixed model methodologies. The genetic changes in all three Nelore herds (control-NeC and selected-NeS and NeT) or only in the selected ones (NeS and NeT) were estimated, only for the females, by least squares, by mixed model including their […]
Keywords: annual genetic trend; genetic change; selection experiment
01/Mar/2002
Paulo Bahiense Ferraz Filho, Alcides de Amorim Ramos, Luiz Otávio Campos da Silva, Júlio César de Souza, Maurício Mello de Alencar, Carlos Henrique Mendes Malhado
DOI: 10.1590/S1516-35982002000300013
Data related to weights of animals of the Tabapuã breed, born from 1959 to 1996, in several areas of Brazil, were analyzed with the objective of evaluating the direct and maternal genetic trends, for body weights adjusted for 205 (W205), 365 (W365) and 550 (W550) days of age. The (co)variance component estimates used in the calculation of the breeding values were obtained by the restricted maximum likelihood method (REML), with a model containing the random additive direct, maternal and permanent […]
Keywords: beef cattle; genetic change; heritability