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| 35. |  | COUTO, D.; BARRIGOSSI, J. A. F.; FERNANDES, P. M. Flutuação populacional de Oebalus spp. (Hemiptera: pentatomidae) no arroz irrigado em várzeas tropicais. In: CONGRESSO BRASILEIRO DA CADEIA PRODUTIVA DE ARROZ, 2.; REUNIÃO NACIONAL DE PESQUISA DE ARROZ, 8., 2006, Brasília, DF. Anais... Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2006. (Embrapa Arroz e Feijão. Documentos, 196).| Biblioteca(s): Embrapa Arroz e Feijão. |
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Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
20/03/2009 |
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Data da última atualização: |
23/01/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - A |
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Autoria: |
COSTA, C. N.; MELO, C. M. R.; PACKER, I. U.; FREITAS, A. F.; TEIXEIRA, N. M.; COBUCCI, J. A. |
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Afiliação: |
Cláudio Nápolis Costa, Embrapa Gado de Leite; Cláudio Manoel Rodrigues de Melo, UFSC; Irineu Umberto Packer, ESALQ/USP; Ary Ferreira de Freitas, Embrapa Gado de Leite; Nilson Milagres Teixeira, Embrapa Gado de Leite; Jaime Araujo Cobuci, UFRGS. |
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Título: |
Genetic parameters for test day milk yield of first lactation Holstein cows estimated by randon regression using Legendre polynomials. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Revista Brasileira de Zootecnia, Viçosa, MG, v. 37, n. 4, p. 602-608, 2008. |
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Idioma: |
Inglês |
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Conteúdo: |
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 classes. The range for the estimates of heritability (0.27 - 0.42) was similar for all models and was higher in mid lactation. There were only slight differences between the models in both genetic and permanent environmental correlations. Genetic correlations decreased for near unity between adjacent days to values as low as 0.24 between early and late lactation. A five parameter LP to model both genetic and permanent environmental effects and assuming a homogeneous residual variance would be a parsimonious option to fit TD yields of Holstein cows in Brazil. |
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Palavras-Chave: |
Avaliação genética; Bovinos de leite; Componentes de co-variância; Herdabilidade. |
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Thesagro: |
Seleção. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/596325/1/Genetic-parameters-for-test-day-milk-yield-of-first-lactation-Holstein-cows.pdf
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Marc: |
LEADER 02112naa a2200241 a 4500
001 1596325
005 2023-01-23
008 2008 bl uuuu u00u1 u #d
100 1 $aCOSTA, C. N.
245 $aGenetic parameters for test day milk yield of first lactation Holstein cows estimated by randon regression using Legendre polynomials.$h[electronic resource]
260 $c2008
520 $aData 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 classes. The range for the estimates of heritability (0.27 - 0.42) was similar for all models and was higher in mid lactation. There were only slight differences between the models in both genetic and permanent environmental correlations. Genetic correlations decreased for near unity between adjacent days to values as low as 0.24 between early and late lactation. A five parameter LP to model both genetic and permanent environmental effects and assuming a homogeneous residual variance would be a parsimonious option to fit TD yields of Holstein cows in Brazil.
650 $aSeleção
653 $aAvaliação genética
653 $aBovinos de leite
653 $aComponentes de co-variância
653 $aHerdabilidade
700 1 $aMELO, C. M. R.
700 1 $aPACKER, I. U.
700 1 $aFREITAS, A. F.
700 1 $aTEIXEIRA, N. M.
700 1 $aCOBUCCI, J. A.
773 $tRevista Brasileira de Zootecnia, Viçosa, MG$gv. 37, n. 4, p. 602-608, 2008.
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Embrapa Gado de Leite (CNPGL) |
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