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Genetic parameters for production traits in primiparous Holstein cows estimated by random regression models 96
Biassus,Igor de Oliveira; Cobuci,Jaime Araújo; Costa,Claudio Napolis; Rorato,Paulo Roberto Nogara; Braccini Neto,José; Cardoso,Leandro Lunardini.
The objective of this study was to estimate genetic parameters for milk, fat and protein yields of Holstein cows using 56,508; 35,091 and 8,326 test-day milk records from 7,015, 4,476 and 1,114 cows, calves of 359, 246 and 90 bulls, respectively. The additive genetic and permanent environmental effects were estimated using REML. Random regression models with Legendre polynomials from order 3 to 6 were used. Residual variances were considered homogeneous over the lactation period. The estimates of variance components showed similar trends, with an increase of the polynomial order for each trait. The heritability estimates ranged from 0.14 to 0.31; 0.03 to 0.21 and 0.09 to 0.33 for milk, fat and protein yield, respectively. Genetic correlations among milk,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fat yield; Herdability; Milk yield; Protein yield; Test-day.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000100012
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Genetics evaluation of minicuttings rooting of Eucalyptus cloeziana provenance 190
Oliveira, Leandro Silva; Dias, Poliana Coqueiro; Almeida, Marcílio de.
Cloning of superior genotypes is presented as an alternative to increase forest productivity, because it allows capturing the genetic gains (additives and non-additives) from forest breeding. Early selection based on characteristics related to adventitious rooting may be important for breeding programs for recalcitrant species, like Eucalyptus cloeziana F. Muell. The objective of this work was to perform the genetic evaluation of E. cloeziana individuals based on adventitious rooting. The genetic control of adventitious rooting of 52 E. cloeziana trees was analyzed by variance components estimation and predicts breeding values. We used REML/BLUP procedure (estimation of variance components - Reml and prediction of breeding values - Blub). The variables...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herdability; Recalcitrance; Propagation; Clonal selection Engenharia Florestal; Melhoramento Florestal Herdabilidade; Recalcitrância; Propagação; Seleção de clones.
Ano: 2015 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/890
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