Data/hora: 23/06/2024 13:36:07

Biblioteca(s): | Embrapa Gado de Leite.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | A - 2
Data corrente: | 20/12/2012
Data da última atualização: | 24/01/2023
Autoria: | REIS FILHO, J. C.; TORAL, F. L. B.; VERNEQUE, R. da S.; VERCESI FILHO, A. E.; TORRES, R. DE A.; EUCLYDES, R. F.
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.
Título: | Incorporation of lactations with non-conventional drying-off causes in genetic evaluation of Gyr dairy cattle.
Ano de publicação: | 2012
Fonte/Imprenta: | Revista Brasileira de Zootecnia, v. 41, n. 9, p. 2018-2024, 2012.
DOI: | https://doi.org/10.1590/S1516-35982012000900008
Idioma: | Inglês
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.
Palavras-Chave: | Autoregressivo; Desenvolvimento; Parametros geneticos.
Thesagro: | Consistência.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
URL: | http://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
Registro original: | Embrapa Gado de Leite (CNPGL)
Exemplares: | CNPGL - (19666-1) - UPC - AP - DD -  -  -  - DIS