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.
06/May/2020
Vicente Ibiapina Neto
, Firmino José Vieira Barbosa
, José Elivalto Guimarães Campelo
, José Lindenberg Rocha Sarmento
ABSTRACT This study was conducted to examine the inclusion of random effects in non-linear models, identify the most suitable models, and describe the growth of naturalized chickens. Live-weight records of 166 birds of the Graúna Dourada, Nordestina, and Teresina ecotypes were estimated. The asymptotic weight (A), integration constant, related to animal initial weight (B), and the maturing rate (k) parameters of the non-linear Gompertz, Logistic, and von Bertalanffy models were estimated and adjusted using the Gauss-Newton method. Residual variance decreased […]
Keywords: gompertz; modelling; phenotypic variation; rooster
01/Jul/2011
Gilberto Romeiro de Oliveira Menezes, Robledo de Almeida Torres, José Lindenberg Rocha Sarmento, Marcelo Teixeira Rodrigues, Luiz Fernando Brito, Paulo Sávio Lopes, [...]
DOI: 10.1590/S1516-35982011000700018
It was used 10,238 weekly test day records from 388 first lactations of Saanen goats with the objective of comparing random regression models (RRM). Firstly, it was compared five models, whose exponential terms of Wilmink function assumed the following values: -0.0350; -0.0500; -0.0565; -0.0680 and -0.1000 (W0350, W0500, W0565, W0680 and W1000, respectively) by considering homogeneity of residual variance over the lactation period. The value -0.0500 was kept in the model W0500 whereas models W0350, W0565, W0680 and W1000 used […]
Keywords: milk; milk yield on test day; modelling; residual variance; Wilmink function
01/Dec/2007
Leonardo de Oliveira Seno, Vera Lúcia Cardoso, Humberto Tonhati
DOI: 10.1590/S1516-35982007000900010
This study was aimed at calculating the economic values for milk (MY), fat (FY) and protein (PY) yields for a dairy buffalo production system in São Paulo State. The performance, revenues and costs were estimated based on a bio-economic model developed for a herd of dairy buffaloes raised in a grazing system, with roughage supply during the dry season and concentrate throughout the year. Economic values were calculated from the marginal difference of annual profit resulting from the increase of […]
Keywords: buffaloes; fat production; modelling; mozzarella; protein production