Estimação de componentes de co-variância para pesos corporais do nascimento aos 365 dias de idade de bovinos Guzerá empregando-se modelos de regressão aleatória

Pelicioni, Luciele Cristina; Albuquerque, Lúcia Galvão de; Queiroz, Salete Linhares

doi:10.1590/s1516-35982009000100007

Cited by 10 publications

(6 citation statements)

References 17 publications

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“…This eigenfunction explained little or none of the genetic variation. Table 3 -Estimates of variances (on the diagonal), covariances (below the diagonal) and correlations (above the diagonal) between the random regression coefficients of the matrix of coefficients and their eigenvalues (λ) for the random effects of the animal A similar tendency has been reported by Akbaş et al (2004) for Japanese quail and by Pelicioni et al (2009) for beef cattle. The authors observed that the first eigenfunction was responsible for most of the genetic variation.…”

Section: Resultssupporting

confidence: 62%

Estimation of (co)variance components and genetic parameters for weights of red-winged tinamou using random regression models

Tholon

Queiroz

2011

R. Bras. Zootec.

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-The objective of this work was to determine genetic parameters for body weight of tinamou in captivity.It was used random regression models in analyses of data by considering the direct additive genetic (DA) and permanent environmental effects of the animal (PE) as random effects. Residual variances were modeled by using a fifth-order variance function. The mean population growth curve was fitted by sixth-order Legendre orthogonal polynomials. Direct additive genetic effects and animal environmental permanent effect were modeled by using Legendre polynomials of order two to nine. The best results were obtained by models with orders of fit of 6 for direct additive genetic effect and of order 3 for permanent effect by Akaike information criterion and of order 3 for both additive genetic effect and permanent effect by Schwarz Bayesian information criterion and likelihood ratio test. Heritability estimates ranged from 0.02 to 0.57. The first eigenvalue explained 94% and 90% of the variation from additive direct and permant environmental effects, respectively.Selection of tinamou for body weight is more effective after 112 days of age.

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Section: Resultssupporting

confidence: 62%

Estimation of (co)variance components and genetic parameters for weights of red-winged tinamou using random regression models

Tholon

Queiroz

2011

R. Bras. Zootec.

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“…Modelos de regressão aleatória para obtenção de parâmetros genéticos do peso de zebuínos foram utilizados para as raças Brahman (Riley et al, 2007), Guzerá (Pelicioni et al, 2009), Nelore (Albuquerque & Meyer, 2001;Nobre et al, 2003;Valente et al, 2008) e Tabapuã (Dias et al, 2006), no entanto, não foram empregados para a raça Indubrasil. Em geral, modelos com polinômios de Legendre, com diferentes ordens, são comparados para o ajuste de efeitos aleatórios (como os genéticos e de ambiente permanente), e as covariâncias entre os coeficientes de regressão aleatória são utilizadas para obtenção das funções de covariância.…”

Section: Introductionunclassified

Parâmetros genéticos do peso desde o nascimento até 730 dias de idade na raça Indubrasil

Toral

Pereira

Bergmann

et al. 2014

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi determinar parâmetros genéticos do peso desde o nascimento até 730 dias de idade na raça Indubrasil. Registros de peso (82.481) de 20.890 animais do nascimento aos 730 dias de idade foram utilizados. Os parâmetros genéticos foram determinados por meio de regressão aleatória. Amostras da distribuição a posteriori dos parâmetros de interesse foram obtidas com o amostrador de Gibbs. Polinômios de Legendre ou segmentados foram utilizados para modelar a trajetória média de crescimento. Os efeitos genético aditivo direto e de ambiente permanente direto foram modelados por polinômios de Legendre. Um polinômio segmentado linear-linear, com nó aos 251 dias de idade, ajustou a trajetória média. Polinômios de Legendre quadráticos e quínticos ajustaram, respectivamente, os efeitos genético aditivo e de ambiente permanente. Três classes de idade foram suficientes para modelar a heterocedasticidade residual. Na maior parte do intervalo considerado, as médias a posteriori da herdabilidade foram crescentes, com valores entre 0,10 e 0,45; a proporção da variância de ambiente permanente em relação à variância fenotípica foi constante, em torno de 0,48; e as correlações genéticas dos pesos em diferentes idades foram altas, acima de 0,60. Há variabilidade genética quanto ao peso na raça Indubrasil, e a seleção pode aumentar a média desta característica.Termos para indexação: Bos taurus, correlação, herdabilidade, polinômios de Legendre, regressão aleatória, seleção. Genetic parameters for weight from birth to 730 days of age in Indubrasil breedAbstract -The objective of this work was to determine the genetic parameters for weight from birth to 730 days of age in Indubrasil breed. Weight data set (82,481) of 20,890 animals from birth to 730 days of age were used. The genetic parameters were determined by random regression. A posteriori distributions of the parameters of interest were obtained by the Gibbs sampler. Legendre or segmented polynomials were used to model the average growth trajectory. The direct additive genetic effect and direct permanent environmental effect were fit by Legendre polynomials. A linear-linear segmented polynomial, with a knot at 251 days of age, fitted the average growth trajectory. Quadratic and quintic Legendre polynomials fitted the direct additive genetic and permanent environmental effects, respectively. Three age classes were enough to model the residual heteroscedasticity. In the most part of the considered interval, the a posteriori means of heritability increased, with values between 0.10 and 0.45; the proportion of permanent environmental variance was constant in relation to the phenotypic variance and close to 0.48; and the genetic correlations of weight at different ages were high, over 0.60. There is genetic variability for weight in Indubrasil breed, and the selection can improve this trait's mean.

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“…MW heritability was also lower than reported for Nellore (0.53  0.06) by Ceacero et al (2016). However, a value of 0.24 has been reported in yearling Guzerat males, with a trend to a reduction with the ageing, since when the animals were 189 days of age, the heritability was 0.53 (Pelicioni et al, 2009).…”

Section: Resultsmentioning

confidence: 52%

Research Article Estimation of variance components for carcass and production traits in Guzerat cattle

Cancino-Baier¹,

Mamani²,

Santana³

et al. 2019

Genet. Mol. Res.

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Estimação de componentes de co-variância para pesos corporais do nascimento aos 365 dias de idade de bovinos Guzerá empregando-se modelos de regressão aleatória

Cited by 10 publications

References 17 publications

Estimation of (co)variance components and genetic parameters for weights of red-winged tinamou using random regression models

Estimation of (co)variance components and genetic parameters for weights of red-winged tinamou using random regression models

Parâmetros genéticos do peso desde o nascimento até 730 dias de idade na raça Indubrasil

Research Article Estimation of variance components for carcass and production traits in Guzerat cattle

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