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/Apr/2003
William José Ferreira, Nilson Milagres Teixeira, Ricardo Frederico Euclydes, Rui da Silva Verneque, Paulo Sávio Lopes, Robledo de Almeida Torres, [...]
DOI: 10.1590/S1516-35982003000200007
153,963 test day milk yield records and 13,273 first lactations of Holstein cows calving between 1989 and 1998, were used with the objective of estimating genetic, phenotypic and environmental parameters for test day milk yield (PLDC) and 305 day milk yield (P305) and to study the convenience of using test day yields in genetic evaluations to replace P305. Four models were used. Models 1 and 2 differed according contemporary grouping and monthly milk records were considered as repeated measures. In […]
Keywords: animal model; Holstein; milk yield; REML methodology; test day yields
01/Oct/2001
Marcos Vinícius Gualberto Barbosa da Silva, William José Ferreira, Jaime Araujo Cobuci, Guilherme Paes Guaragna, Paulo Rogério Palma de Oliveira
DOI: 10.1590/S1516-35982001000600013
The data used in this study are from the first five lactations of 1,406 cows of the Mantiqueira Ecotype, daughters of 113 sires, with calving from 1952 to 1997. The total milk yield (PL), fat production (PG), lactation period (DL), and days dry (PS) were obtained from NPZGJRA/IZ/APTA/SAA. Based on the genetic values predictions, for each studied feature selection differentials and genetic trends were estimated though four selection paths of selection: bulls to breed bulls (SB), cows to breed bulls […]
Keywords: animal model; dairy cattle; genetic trend; Mantiqueira ecotype; REML methodology; selection differential
01/Jul/2001
Marcos Vinícius Gualberto Barbosa da Silva, William José Ferreira, Jaime Araujo Cobuci, Guilherme Paes Guaragna, Paulo Rogério Palma de Oliveira
DOI: 10.1590/S1516-35982001000500016
Genealogies of 2070 animals and records from the first five lactations of 1406 cows of the Mantiqueira type cattle, daughters of 113 sires, were analyzed to estimate the frequency of inbred animals, the inbreeding average per generation and the possible effect of inbreeding increase on reproductive and productive traits. The evaluated traits were age at first calving (IPP), calving intervals (IDP), total milk production (PL) and lactation period (DL). Models for PL, IDP and DL included the fixed effects of […]
Keywords: animal model; dairy cattle; inbreeding; Mantiqueira type; REML methodology
01/Jul/2001
Marcos Vinícius Gualberto Barbosa da Silva, Jaime Araujo Cobuci, William José Ferreira, Guilherme Paes Guaragna, Paulo Rogério Palma de Oliveira
DOI: 10.1590/S1516-35982001000500015
The objective of this work was to estimate the genetic parameters, product-moment and rank correlations between breeding values, and also correlated responses for reproductive traits using bivariate analysis of total milk production (PL) and the age at the first calving (IPP), or calving intervals (IDP), or days open (PSERV). Records from the NPZGJRA/IZ/APTA/SAA-SSP breeding program of the first five lactations of 1406 cows of Mantiqueira ecotype; daughters of 113 sires, with calvings from 1952 to 1997 were used. The MTDFREML […]
Keywords: animal model; correlated response; dairy cattle; Mantiqueira ecotype; rank correlation; REML methodology