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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
20/12/2012 |
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Data da última atualização: |
24/01/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
REIS FILHO, J. C.; TORAL, F. L. B.; VERNEQUE, R. da S.; VERCESI FILHO, A. E.; TORRES, R. DE A.; EUCLYDES, R. F. |
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Afiliação: |
JOÃO CRUZ REIS FILHO, MAPA; FABIO LUIZ B. TORAL, UFMG; RUI DA SILVA VERNEQUE, CNPGL; ANIBAL EUGENIO VERCESI FILHO, APTA; ROBLEDO DE ALMEIDA TORRES, UFV; RICARDO FREDERICO EUCLYDES, UFV. |
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Título: |
Incorporation of lactations with non-conventional drying-off causes in genetic evaluation of Gyr dairy cattle. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Revista Brasileira de Zootecnia, v. 41, n. 9, p. 2018-2024, 2012. |
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DOI: |
https://doi.org/10.1590/S1516-35982012000900008 |
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Idioma: |
Inglês |
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Conteúdo: |
Test-day records of milk yields from the first three lactations were used to verify consequences of incorporation of lactation with non-conventional drying-off causes in genetic evaluation of Gyr dairy cattle. The first file (File1) was composed of test-day records of lactations with conventional drying-off causes. In the second file (File2), the test-day records of lactations with non-conventional drying-off causes were included, such as drying-off by death or separation of the calf, disease, death or sale of cow, and removal of cow from milking control. Data were analyzed by mixed models, using an autoregressive process to adjust the random effects of long-term and short-term environment. The inclusion of test-day records from lactations with non-conventional drying-off causes increased the number of controls by 12% and the number of cows by 18%, and it generated an increase in the estimates of variance components. These results impacted estimates of heritability, calculated at 0.32, 0.28 and 0.26 for the first, second and third lactations in File1, respectively, while in File2 they were 0.34, 0.30 and 0.28 to the same lactation order. The estimated accuracy of predicted breeding values in File2 were higher in relation to File1, but the Pearson and Spearman correlations between predicted breeding values of animals in the two files were high. Lactations with non-conventional drying-off causes can be incorporated to the routines of genetic evaluation of Gyr dairy cattle, because they provide higher estimates of heritability and accuracy of breeding values, which could raise expectations of genetic gains with selection. MenosTest-day records of milk yields from the first three lactations were used to verify consequences of incorporation of lactation with non-conventional drying-off causes in genetic evaluation of Gyr dairy cattle. The first file (File1) was composed of test-day records of lactations with conventional drying-off causes. In the second file (File2), the test-day records of lactations with non-conventional drying-off causes were included, such as drying-off by death or separation of the calf, disease, death or sale of cow, and removal of cow from milking control. Data were analyzed by mixed models, using an autoregressive process to adjust the random effects of long-term and short-term environment. The inclusion of test-day records from lactations with non-conventional drying-off causes increased the number of controls by 12% and the number of cows by 18%, and it generated an increase in the estimates of variance components. These results impacted estimates of heritability, calculated at 0.32, 0.28 and 0.26 for the first, second and third lactations in File1, respectively, while in File2 they were 0.34, 0.30 and 0.28 to the same lactation order. The estimated accuracy of predicted breeding values in File2 were higher in relation to File1, but the Pearson and Spearman correlations between predicted breeding values of animals in the two files were high. Lactations with non-conventional drying-off causes can be incorporated to the routines of genetic evaluation of Gyr dairy cattle, bec... Mostrar Tudo |
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Palavras-Chave: |
Autoregressivo; Desenvolvimento; Parametros geneticos. |
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Thesagro: |
Consistência. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/943237/1/Incorporation-of-lactations-with-non-conventional-drying-off-causes-in-genetic-evaluation-of-Gyr-dairy-cattle.pdf
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Marc: |
LEADER 02440naa a2200241 a 4500
001 1943237
005 2023-01-24
008 2012 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1590/S1516-35982012000900008$2DOI
100 1 $aREIS FILHO, J. C.
245 $aIncorporation of lactations with non-conventional drying-off causes in genetic evaluation of Gyr dairy cattle.$h[electronic resource]
260 $c2012
520 $aTest-day records of milk yields from the first three lactations were used to verify consequences of incorporation of lactation with non-conventional drying-off causes in genetic evaluation of Gyr dairy cattle. The first file (File1) was composed of test-day records of lactations with conventional drying-off causes. In the second file (File2), the test-day records of lactations with non-conventional drying-off causes were included, such as drying-off by death or separation of the calf, disease, death or sale of cow, and removal of cow from milking control. Data were analyzed by mixed models, using an autoregressive process to adjust the random effects of long-term and short-term environment. The inclusion of test-day records from lactations with non-conventional drying-off causes increased the number of controls by 12% and the number of cows by 18%, and it generated an increase in the estimates of variance components. These results impacted estimates of heritability, calculated at 0.32, 0.28 and 0.26 for the first, second and third lactations in File1, respectively, while in File2 they were 0.34, 0.30 and 0.28 to the same lactation order. The estimated accuracy of predicted breeding values in File2 were higher in relation to File1, but the Pearson and Spearman correlations between predicted breeding values of animals in the two files were high. Lactations with non-conventional drying-off causes can be incorporated to the routines of genetic evaluation of Gyr dairy cattle, because they provide higher estimates of heritability and accuracy of breeding values, which could raise expectations of genetic gains with selection.
650 $aConsistência
653 $aAutoregressivo
653 $aDesenvolvimento
653 $aParametros geneticos
700 1 $aTORAL, F. L. B.
700 1 $aVERNEQUE, R. da S.
700 1 $aVERCESI FILHO, A. E.
700 1 $aTORRES, R. DE A.
700 1 $aEUCLYDES, R. F.
773 $tRevista Brasileira de Zootecnia$gv. 41, n. 9, p. 2018-2024, 2012.
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Embrapa Gado de Leite (CNPGL) |
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| 1. |  | REIS FILHO, J. C.; TORAL, F. L. B.; VERNEQUE, R. da S.; VERCESI FILHO, A. E.; TORRES, R. DE A.; EUCLYDES, R. F. Incorporation of lactations with non-conventional drying-off causes in genetic evaluation of Gyr dairy cattle. Revista Brasileira de Zootecnia, v. 41, n. 9, p. 2018-2024, 2012.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Gado de Leite. |
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