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| Mota,Rodrigo Reis; Lopes,Paulo Sávio; Marques,Luiz Fernando Aarão; Silva,Luciano Pinheiro da; Resende,Marcos Deon Vilela de; Torres,Robledo de Almeida. |
| 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 62,895 weight records from 23,160 animals. The weight records were adjusted for ages of 100, 205, 365, 450, 550 and 730 days. The (co)variance components and genetic parameters were estimated by the restricted maximum likelihood method. The (co)variance components were similar in both models, except for maternal permanent environment variance. Direct heritabilities (h²d) in MTM1 were 0.04, 0.11, 0.20, 0.27,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Body weight; (co)variance components; Heritability. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000100007 |
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| Campos,Rafael Viegas; Cobuci,Jaime Araujo; Costa,Claudio Napolis; Braccini Neto,José. |
| Data from 26,558 Holstein cows in 802 herds were used to estimate genetic, residual and phenotypic parameters for 22 type traits. The model included the fixed effects of herd-year, period of classification, classifier, stage of lactation and age of cows at calving (covariate) and random genetic and residual effects. Heritability for type traits ranged from 0.10 to 0.39. The genetic variability in these traits suggested the possibility for moderate genetic gains through selection. The phenotypic correlations were moderated, mainly in the section conformation. Genetic correlations between type traits ranged from -0.44 to 0.85. High genetic correlations indicated that breeding programs could be successful without including all type traits. The selection for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: (co)variance components; Dairy cattle; Genetic correlations; Heritability; REMLF90; Selection. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001000003 |
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