Covariance functions for test-day milk yield in Gir cattle

Detalhes bibliográficos
Autor(a) principal: Pereira, Rodrigo Junqueira
Data de Publicação: 2011
Outros Autores: Lopes, Paulo Sávio, Verneque, Rui da Silva, Júnior, Mário Luiz Santana, Lagrotta, Marcos Rodrigues, Torres, Robledo de Almeida
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.
id EMBRAPA-4_d80c5f131740773c6670af87badaf51d
oai_identifier_str oai:ojs.seer.sct.embrapa.br:article/9363
network_acronym_str EMBRAPA-4
network_name_str Pesquisa Agropecuária Brasileira (Online)
repository_id_str
spelling 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
_version_ 1793416673675444224