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	Provedor de dados Bragantia (2) R. Bras. Zootec. (1) Autor REGAZZI,ADAIR JOSÉ (2) VIANA,JOSÉ MARCELO SORIANO (2) Cobuci,Jaime Araujo (1) Costa,Claudio Napolis (1) Freitas,Ary Ferreira de (1) Melo,Claudio Manoel Rodrigues de (1) Packer,Irineu Umberto (1) Teixeira,Nilson Milagres (1) Mais... Palavra-chave Covariance components (3) Genetic parameters (2) Quantitative genetics (2) Square lattice (2) Variance components (2) Dairy cattle (1) Genetic evaluation (1) Heritability (1) Joint analysis (1) Selection (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2008 (1) 1999 (2) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Genetic parameters for test day milk yield of first lactation Holstein cows estimated by random regression using Legendre polynomials R. Bras. Zootec. Costa,Claudio Napolis; Melo,Claudio Manoel Rodrigues de; Packer,Irineu Umberto; Freitas,Ary Ferreira de; Teixeira,Nilson Milagres; Cobuci,Jaime Araujo. Data comprising 263,390 test-day (TD) records of 32,448 first parity cows calving in 467 herds between 1991 and 2001 from the Brazilian Holstein Association were used to estimate genetic and permanent environmental variance components in a random regression animal model using Legendre polynomials (LP) of order three to five by REML. Residual variance was assumed to be constant in all or in some classes of lactation periods for each LP. Estimates of genetic and permanent environmental variances did not show any trend due to the increase in the LP order. Residual variance decreased as the order of LP increased when it was assumed constant, and it was highest at the beginning of lactation and relatively constant in mid lactation when assumed to vary between... Tipo: Info:eu-repo/semantics/article Palavras-chave: Covariance components; Dairy cattle; Genetic evaluation; Heritability; Selection. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982008000400003 Estimation of genetic parameters in the analysis of square lattice experiment group Bragantia VIANA,JOSÉ MARCELO SORIANO; REGAZZI,ADAIR JOSÉ. Aiming to demonstrate how to obtain unbiased estimates of genetic parameters of base populations, unaffected by genotype x environment effects, this paper presents the variance and covariance components of the intra-block analysis of a group of square lattice experiments and the estimators of the components associated to treatment effect. Random model and mixed models with environment effect fixed and other effects random are considered. In the analysis with treatments not corrected for blocks/replications/environments, the estimators of the variance and covariance components due to treatment effect are different from those of the analysis considering the complete block model. Data from two experiments of a breeding program of Eucalyptus pyrocarpa were... Tipo: Info:eu-repo/semantics/article Palavras-chave: Quantitative genetics; Genetic parameters; Variance components; Covariance components; Joint analysis; Square lattice. Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051999000100019 Estimation of genetic parameters in the square lattice analysis Bragantia VIANA,JOSÉ MARCELO SORIANO; REGAZZI,ADAIR JOSÉ. This paper shows how to obtain unbiased estimates of genetic parameters of base populations, e.g., genotypic variance among families, heritability on a family mean basis, genotypic correlation and direct and indirect expected genetic gains, when the sampled families were evaluated in square lattice experiment. The theoretical part presents the variance and covariance components of the intra-block analysis of square lattice and the estimators of the components associated to treatment effect, considering the ordinary least squares method. In the analysis with treatments not corrected for blocks/replications, the estimator of the component due to treatment effect is equal to that of the analysis considering the complete block model. Experimental data from a... Tipo: Info:eu-repo/semantics/article Palavras-chave: Quantitative genetics; Genetic parameters; Variance components; Covariance components; Square lattice. Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051999000100018 Registros recuperados: 3 Primeira ... 1 ... Última

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