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.
This study aimed to evaluate the effects of major genes and population size on variance components estimation using four different types of selected populations. Variance components were estimated by classical and Bayesian methodologies, with three a priori information levels. In general, results from REML and Bayesian analyses with flat priors were similar. Except for Bayesian analysis with an informative prior, additive genetic variance estimates were not accurate in populations in which the trait is controlled by major genes. The use of pedigree information and records of all individuals back to the base-population was necessary to improve accuracy of variance component estimates, except for large populations in which the trait is controlled by a large number of genes.
Estimation of variance components under major genes influence, comparing Bayesian and classical methodologies under different scenarios
Assis,Giselle Mariano Lessa de and Júnior,José Marques Carneiro and Euclydes,Ricardo Frederico and Torres,Robledo de Almeida and Lopes,Paulo Sávio. Estimation of variance components under major genes influence, comparing Bayesian and classical methodologies under different scenarios. R. Bras. Zootec. [online]. 2007, vol.36, 5, [cited 2026-06-03], pp.1266-1274. Available from: <https://rbz.org.br/article/estimation-of-variance-components-under-major-genes-influence-comparing-bayesian-and-classical-methodologies-under-different-scenarios/>. ISSN 1516-3598. https://doi.org/10.1590/S1516-35982007000600007.
Assis,Giselle Mariano Lessa de; Júnior,José Marques Carneiro; Euclydes,Ricardo Frederico; Torres,Robledo de Almeida; Lopes,Paulo Sávio. Estimation of variance components under major genes influence, comparing Bayesian and classical methodologies under different scenarios. R. Bras. Zootec., v.36, 5, p. 1266-1274. Oct. 2007. Available from: <https://rbz.org.br/article/estimation-of-variance-components-under-major-genes-influence-comparing-bayesian-and-classical-methodologies-under-different-scenarios/>. acess on 03 Jun. 2026. https://doi.org/10.1590/S1516-35982007000600007.
Assis,Giselle Mariano Lessa de, & Júnior,José Marques Carneiro, & Euclydes,Ricardo Frederico, & Torres,Robledo de Almeida, & Lopes,Paulo Sávio. (2007). Estimation of variance components under major genes influence, comparing Bayesian and classical methodologies under different scenarios. R. Bras. Zootec., 36(5) , 1266-1274. https://doi.org/10.1590/S1516-35982007000600007.
AssisGiselle Mariano Lessa de, JúniorJosé Marques Carneiro, EuclydesRicardo Frederico, TorresRobledo de Almeida, LopesPaulo Sávio. Estimation of variance components under major genes influence, comparing Bayesian and classical methodologies under different scenarios. R. Bras. Zootec. [Internet]. 2007 Oct [cited 2026 Jun 03]; 36(5): 1266-1274. Available from: https://rbz.org.br/article/estimation-of-variance-components-under-major-genes-influence-comparing-bayesian-and-classical-methodologies-under-different-scenarios/. https://doi.org/10.1590/S1516-35982007000600007.
Figure 2
Evolution of cow weight according to the genetic group of calves, from farrowing to weaning.
PCH - calves from predominantly Charolais cows; PNE - calves from predominantly Nellore cows; AACH - calves from breed bulls Aberdeen Angus and predominantly Charolais cow; AANE - calves from breed bulls Aberdeen Angus and predominantly Nellore cow.
