Direct Maternal Genetic Covariance
Mostrando 1-12 de 14 artigos, teses e dissertações.
-
1. UTILIZAÇÃO DE MODELOS DE REGRESSÃO ALEATÓRIA PARA OBTENÇÃO DE PARÂMETROS GENÉTICOS DE BOVINOS DA RAÇA TABAPUÃ
Resumo Este trabalho utilizou 28.643 registros de pesos, do nascimento aos 660 dias de idade, de 6.471 animais da raça Tabapuã para estimar componentes de variância, covariância e parâmetros genéticos, utilizando o modelo de regressão aleatória. Foi utilizado algoritmo de busca AIREML através do método da máxima verossimilhança restrita pelo prog
Ciênc. anim. bras.. Publicado em: 10/06/2019
-
2. Estimation of genetic parameters for growth traits in Tabapuã cattle using a multi-trait model
To provide information that can contribute to the genetic evaluation and selection in Tabapuã cattle, genetic parameters were estimated for growth traits using a multi-trait animal model. (Co)variance components were estimated by a Bayesian approach using the Gibbs Sampler. Moderate and similar responses to selection are expected when selecting for weights
R. Bras. Zootec.. Publicado em: 2013-08
-
3. The influence of animals from embryo transfer on the genetic evaluation of growth in Simmental beef cattle by using multi-trait models
The weight records from Simmental beef cattle were used in a genetic evaluation of growth with or without the inclusion of animals obtained by embryo transfer. A multi-trait model in which embryo transfer individuals were excluded (MTM1) contained 29,510 records from 10,659 animals, while another model without exclusion of these animals (MTM2) contained 62,8
Genet. Mol. Biol.. Publicado em: 01/02/2013
-
4. Genetic parameters and relationships between heifers rebreeding and hip height in Nellore cattle
The objective of this study was to estimate heritability and verify the genetic correlations between heifers subsequent rebreeding with weaning hip height (WHH) and yearling hip height (YHH), using Bayesian inference. The (co)variance components and genetic parameters were estimated using an animal nonlinear (threshold) model for subsequent rebreeding and an
Revista Brasileira de Zootecnia. Publicado em: 2012-03
-
5. Estimates of covariance components for hygienic behavior in Africanized honeybees (Apis mellifera)
Genetic and phenotypic parameters considering the genetic effect on hygienic behavior of queen and workers from 40 Africanized honeybees colonies were estimated separately. Maternal origin of queens was controlled whereas the paternal was unknown, and different groups of workers were considered in three seasons, October 2006, April 2007 and August 2007, but
Revista Brasileira de Zootecnia. Publicado em: 2011-09
-
6. Effect of data structure on estimates of (co) variances of the weight of breast-in beef cattle, using simulated data / EFEITO DA ESTRUTURA DOS DADOS SOBRE AS ESTIMATIVAS DE (CO)VARIÂNCIAS DE PESO À DESMAMA EM BOVINOS DE CORTE, USANDO DADOS SIMULADOS
The objective was to evaluate the effects of the year (sample size, genealogy and data structure), mother-offspring link proportion (mother-offspring pairs, both with weaning weights), inclusion (M2) or not (M1) of the genetic direct-maternal covariance in the model, the direct-maternal correlation (C) magnitude and the direct and maternal genetic variance r
Publicado em: 2009
-
7. EFEITO DA ESTRUTURA DOS DADOS SOBRE AS ESTIMATIVAS DE (CO)VARIÂNCIAS DE PESO À DESMAMA EM BOVINOS DE CORTE, USANDO DADOS SIMULADOS / Effect of data structure on estimates of (co) variances of the weight of breast-in beef cattle, using simulated data
The objective was to evaluate the effects of the year (sample size, genealogy and data structure), mother-offspring link proportion (mother-offspring pairs, both with weaning weights), inclusion (M2) or not (M1) of the genetic direct-maternal covariance in the model, the direct-maternal correlation (C) magnitude and the direct and maternal genetic variance r
Publicado em: 2009
-
8. Effect of data structure on estimates of (co) variances of the weight of breast-in beef cattle, using simulated data / EFEITO DA ESTRUTURA DOS DADOS SOBRE AS ESTIMATIVAS DE (CO)VARIÂNCIAS DE PESO À DESMAMA EM BOVINOS DE CORTE, USANDO DADOS SIMULADOS
Objetivou-se avaliar os efeitos do ano (tamanho amostral, genealogia e estrutura dos dados), da proporção de elos mãe-progênie (pares mãe-filho ambos com registro), da inclusão (M2) ou não (M1) da covariância genética direta-maternal no modelo, da magnitude da correlação genética direta-maternal (C) e da razão entre as variâncias genéticas dir
Publicado em: 2009
-
9. Estimativa e parâmetros genéticos para características de crescimento e perímetro escrotal na raça Pardo Suíço Corte / Estimation of genetic parameters for growth traits and scrotal circumference in Braunvieh cattle
The aim of this study was to investigate a database of the Braunvieh cattle in Brazil, to estimate genetic parameters for growth traits, preweaning and postweaning weight gains and scrotal circumference, as well as carcass traits in purebreed and crossbreed Braunvieh cattle. The growth traits analyzed were birth weight (PN), weight at 120 days (P120), 205 da
Publicado em: 2008
-
10. Genetic evaluation of beef cattle composite / Avaliação genética de bovinos de corte compostos
Genetic groups were used to estimate the heterosis and its profile along generations in the population of Tropical Montana composite. The genetic groups evaluated were: pure breed animals, F1, other crossbreds and Tropical Montana composites. It was used a pedigree data to calculate each animal generation. The data were adjusted for the effects of total mate
Publicado em: 2007
-
11. EFFECT OF THE INCLUSION OF THE DIRECT-MATERNAL COVARIANCE ON THE ESTIMATIVE OF GENETIC PARAMETERS AND ON THE PREDICTION OF THE GENETIC VALUES FOR WEIGHT GAIN FOR CATTLE / EFEITO DA INCLUSÃO DA COVARIÂNCIA GENÉTICA DIRETA-MATERNA, NA ANÁLISE PARA ESTIMAR PARÂMETROS GENÉTICOS E PREDIZER VALORES GENÉTICOS PARA GANHO DE PESO EM BOVINOS DE CORTE.
The present study has as objective to evaluate the effect of the inclusion in the model of analysis, the covariance between the additive genetic direct and maternal effects, on the estimation of genetic parameters for average daily gain from birth to weaning (GMDND) and from weaning to 550 days of age (GMDDS), and on the prediction of genetic values and rank
Publicado em: 2005
-
12. Estimation of additive direct and maternal genetic and non additive effects and prediction of the performance of weights, scrotal circumference and muscling scores in a Bos taurus x Bos indicus, composite beef cattle population. / Estimação de efeitos genéticos aditivos diretos e maternos e não aditivos e, predição do desempenho de pesos, perímetro escrotal e musculosidade em uma população de bovinos de corte compostos (Bos taurus x Bos indicus)
Data of weights at birth, weaning, 390 days, weight gain from weaning to 390 days, scrotal circumference and muscling scores at 390 days of age of a population used in the formation of the Montana Tropical® beef composite, raised under tropical conditions, were analyzed under three different models to: i) determine genetic and environment effects ii) determ
Publicado em: 2005