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| Registros recuperados : 290 | |
| 146. |  | AVILA, V. S. de; LEDUR, M. C.; BARIONI JUNIOR, W.; SCHMIDT, G. S.; COSTA, C. N. Desempenho e Qualidade de Carcaca em Linhagens Comerciais de Frangos de Corte. Pesquisa Agropecuaria Brasileira, Brasilia, v.28, n.6, p.649-656,jun.1993| Biblioteca(s): Embrapa Unidades Centrais. |
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| 157. | | KERN, E. L.; COBUCI, J. A.; COSTA, C. N.; BRACCINI NETO, J.; PICCOLI, M. L. Parametros genéticos para diferentes medidas de longevidade em vacas da raça holandesa, utilizando modelos linear e limiar. In: SIMPÓSIO BRASILEIRO DE MELHORAMENTO ANIMAL, 10., 2013, Uberaba. Anais... Viçosa: Sociedade Brasileira de Melhoramento Animal, 2013.| Biblioteca(s): Embrapa Gado de Leite. |
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| 158. | | COSTA, C. N.; COBUCI, J. A.; FREITAS, A. F. de; VALLOTO, A. A.; SOUZA, M. A. Parâmetros genéticos para o escore da contagem de células somáticas da primeira lactação de vacas da raça Holandesa no Brasil. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 47., 2010, Salvador. Empreendedorismo e progresso científico na zootecnia brasileira: anais. Viçosa, MG: Sociedade Brasileira de Zootecnia, 2010.| Biblioteca(s): Embrapa Gado de Leite. |
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| 160. | | COBUCCI, J. A.; COSTA, C. N.; BRACCINI NETO, J.; ALMEIDA, T. P.; VELHO, M. M. S. Parâmetros genéticos para persistência nas três primeiras lactações de vacas holandesas via modelos de regressão aleatória. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA. 45., 2008, Lavras, MG. Anais... Viçosa, MG: Sociedade Brasileira de Zootecnia, 2008.| Biblioteca(s): Embrapa Gado de Leite. |
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| Registros recuperados : 290 | |
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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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