Covariance functions for test-day milk yield in Gir cattle
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Pesquisa Agropecuária Brasileira (Online) |
Texto Completo: | https://seer.sct.embrapa.br/index.php/pab/article/view/9363 |
Resumo: | The objective of this work was to estimate covariance functions for test-day milk yield (TDMY). Twenty-seven thousand TDMY records of 3,362 first lactations of Gir cows calving between 1990 and 2007 were analyzed. The TDMY data were grouped in 20 biweekly classes, analyzed by random regression models, whose random, additive-genetic and permanent environment effects were fitted by Wilmink's (W) or Ali & Schaeffer's (AS) functions. The residual variance (VR) modelling was fitted by 1, 4, 6, or 10 classes. The heritability estimates for TDMY varied from 0.12 to 0.32 for the AS function, and from 0.09 to 0.33 for W function, and were larger in the begining of the lactation period. The genetic correlations decreased from near unity, among adjacent TDMY values, to negative values between the first and the two last quarters of lactation. The model using the AS function with four VR classes, is a parsimonious option for the TDMY fitting of Gir cows in Brazil. |
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Covariance functions for test-day milk yield in Gir cattleFunções de covariância para produção de leite no dia do controle em bovinos Gir leiteirodairy cattle; parametric function; Bayesian inference; genetic parametersbovinos de leite; função paramétrica; inferência bayesiana; parâmetros genéticosThe objective of this work was to estimate covariance functions for test-day milk yield (TDMY). Twenty-seven thousand TDMY records of 3,362 first lactations of Gir cows calving between 1990 and 2007 were analyzed. The TDMY data were grouped in 20 biweekly classes, analyzed by random regression models, whose random, additive-genetic and permanent environment effects were fitted by Wilmink's (W) or Ali & Schaeffer's (AS) functions. The residual variance (VR) modelling was fitted by 1, 4, 6, or 10 classes. The heritability estimates for TDMY varied from 0.12 to 0.32 for the AS function, and from 0.09 to 0.33 for W function, and were larger in the begining of the lactation period. The genetic correlations decreased from near unity, among adjacent TDMY values, to negative values between the first and the two last quarters of lactation. The model using the AS function with four VR classes, is a parsimonious option for the TDMY fitting of Gir cows in Brazil.O objetivo deste trabalho foi estimar funções de covariância para a produção de leite no dia do controle (PLDC). Foram analisados 27 mil registros de PLDC de 3.362 primeiras lactações de vacas da raça Gir leiteira, paridas entre 1990 e 2007. As PLDC foram agrupadas em vinte classes quinzenais, analisadas por modelos de regressão aleatória, cujos efeitos aleatórios, genético-aditivo e de ambiente permanente foram modelados pelas funções de Wilmink (W) ou Ali & Schaeffer (AS). A modelagem da variância residual (VR) foi ajustada por meio de 1, 4, 6 ou 10 classes. As estimativas de herdabilidade para a PLDC variaram de 0,12 a 0,32, para a função AS, e de 0,09 a 0,33, para a função W, e foram maiores ao início da lactação. As correlações genéticas entre as PLDC decresceram de valores próximos à unidade, entre controles adjacentes, para valores negativos entre as PLDC da primeira e duas últimas quinzenas da lactação. O modelo que empregou a função AS com quatro classes de VR é uma opção parcimoniosa para o ajuste das PLDC de vacas Gir leiteira no Brasil.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraCAPESCNPqFAPEMIGPereira, Rodrigo JunqueiraLopes, Paulo SávioVerneque, Rui da SilvaJúnior, Mário Luiz SantanaLagrotta, Marcos RodriguesTorres, Robledo de Almeida2011-01-28info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/9363Pesquisa Agropecuaria Brasileira; v.45, n.11, nov. 2010; 1303-1311Pesquisa Agropecuária Brasileira; v.45, n.11, nov. 2010; 1303-13111678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/9363/6101https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/9363/4563info:eu-repo/semantics/openAccess2014-11-13T18:15:38Zoai:ojs.seer.sct.embrapa.br:article/9363Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-11-13T18:15:38Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Covariance functions for test-day milk yield in Gir cattle Funções de covariância para produção de leite no dia do controle em bovinos Gir leiteiro |
title |
Covariance functions for test-day milk yield in Gir cattle |
spellingShingle |
Covariance functions for test-day milk yield in Gir cattle Pereira, Rodrigo Junqueira dairy cattle; parametric function; Bayesian inference; genetic parameters bovinos de leite; função paramétrica; inferência bayesiana; parâmetros genéticos |
title_short |
Covariance functions for test-day milk yield in Gir cattle |
title_full |
Covariance functions for test-day milk yield in Gir cattle |
title_fullStr |
Covariance functions for test-day milk yield in Gir cattle |
title_full_unstemmed |
Covariance functions for test-day milk yield in Gir cattle |
title_sort |
Covariance functions for test-day milk yield in Gir cattle |
author |
Pereira, Rodrigo Junqueira |
author_facet |
Pereira, Rodrigo Junqueira Lopes, Paulo Sávio Verneque, Rui da Silva Júnior, Mário Luiz Santana Lagrotta, Marcos Rodrigues Torres, Robledo de Almeida |
author_role |
author |
author2 |
Lopes, Paulo Sávio Verneque, Rui da Silva Júnior, Mário Luiz Santana Lagrotta, Marcos Rodrigues Torres, Robledo de Almeida |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
CAPES CNPq FAPEMIG |
dc.contributor.author.fl_str_mv |
Pereira, Rodrigo Junqueira Lopes, Paulo Sávio Verneque, Rui da Silva Júnior, Mário Luiz Santana Lagrotta, Marcos Rodrigues Torres, Robledo de Almeida |
dc.subject.por.fl_str_mv |
dairy cattle; parametric function; Bayesian inference; genetic parameters bovinos de leite; função paramétrica; inferência bayesiana; parâmetros genéticos |
topic |
dairy cattle; parametric function; Bayesian inference; genetic parameters bovinos de leite; função paramétrica; inferência bayesiana; parâmetros genéticos |
description |
The objective of this work was to estimate covariance functions for test-day milk yield (TDMY). Twenty-seven thousand TDMY records of 3,362 first lactations of Gir cows calving between 1990 and 2007 were analyzed. The TDMY data were grouped in 20 biweekly classes, analyzed by random regression models, whose random, additive-genetic and permanent environment effects were fitted by Wilmink's (W) or Ali & Schaeffer's (AS) functions. The residual variance (VR) modelling was fitted by 1, 4, 6, or 10 classes. The heritability estimates for TDMY varied from 0.12 to 0.32 for the AS function, and from 0.09 to 0.33 for W function, and were larger in the begining of the lactation period. The genetic correlations decreased from near unity, among adjacent TDMY values, to negative values between the first and the two last quarters of lactation. The model using the AS function with four VR classes, is a parsimonious option for the TDMY fitting of Gir cows in Brazil. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-01-28 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/9363 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/9363 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/9363/6101 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/9363/4563 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
dc.source.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira; v.45, n.11, nov. 2010; 1303-1311 Pesquisa Agropecuária Brasileira; v.45, n.11, nov. 2010; 1303-1311 1678-3921 0100-104x reponame:Pesquisa Agropecuária Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Agropecuária Brasileira (Online) |
collection |
Pesquisa Agropecuária Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pab@sct.embrapa.br || sct.pab@embrapa.br |
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1793416673675444224 |