Genetic parameters for first lactation test-day milk flow in Holstein cows

Genetic parameters for test-day milk flow (TDMF) of 2175 first lactations of Holstein cows were estimated using multiple-trait and repeatability models. The models included the direct additive genetic effect as a random effect and contemporary group (defined as the year and month of test) and age of...

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Autores: Laureano, M. M. M., Bignardi, A. B. [UNESP], El Faro, L., Cardoso, V. L., Albuquerque, Lucia Galvão de [UNESP]
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:Brasil
Recursos:Universidade Estadual Paulista (UNESP)
Repositorio:Repositório Institucional da UNESP
Idioma:inglés
OAI Identifier:oai:repositorio.unesp.br:11449/4495
Acesso em linha:http://dx.doi.org/10.1017/S1751731111001376
http://hdl.handle.net/11449/4495
Access Level:acceso abierto
Palavra-chave:functional trait
Genetic correlation
Heritability
milkability
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spelling Genetic parameters for first lactation test-day milk flow in Holstein cowsfunctional traitGenetic correlationHeritabilitymilkabilityGenetic parameters for test-day milk flow (TDMF) of 2175 first lactations of Holstein cows were estimated using multiple-trait and repeatability models. The models included the direct additive genetic effect as a random effect and contemporary group (defined as the year and month of test) and age of cow at calving (linear and quadratic effect) as fixed effects. For the repeatability model, in addition to the effects cited, the permanent environmental effect of the animal was also included as a random effect. Variance components were estimated using the restricted maximum likelihood method in single- and multiple-trait and repeatability analyses. The heritability estimates for TDMF ranged from 0.23 (TDMF 6) to 0.32 (TDMF 2 and TDMF 4) in single-trait analysis and from 0.28 (TDMF 7 and TDMF 10) to 0.37 (TDMF 4) in multiple-trait analysis. In general, higher heritabilities were observed at the beginning of lactation until the fourth month. Heritability estimated with the repeatability model was 0.27 and the coefficient of repeatability for first lactation TDMF was 0.66. The genetic correlations were positive and ranged from 0.72 (TDMF 1 and 10) to 0.97 (TDMF 4 and 5). The results indicate that milk flow should respond satisfactorily to selection, promoting rapid genetic gains because the estimated heritabilities were moderate to high. Higher genetic gains might be obtained if selection was performed in the TDMF 4. Both the repeatability model and the multiple-trait model are adequate for the genetic evaluation of animals in terms of milk flow, but the latter provides more accurate estimates of breeding values.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Univ Fed Amazonas, Dept Anim Sci, BR-69152450 Parintins, Amazonas, BrazilSão Paulo State Univ UNESP, Dept Anim Sci, BR-14884900 São Paulo, BrazilAPTA, Polo Reg Ctr Leste, BR-14001970 Ribeirao Preto, SP, BrazilSão Paulo State Univ UNESP, Dept Anim Sci, BR-14884900 São Paulo, BrazilCambridge University PressUniversidade Federal do Amazonas (UFAM)Universidade Estadual Paulista (Unesp)Agência Paulista de Tecnologia dos Agronegócios (APTA)2014-05-20T13:18:24Z2014-05-20T13:18:24Z2012-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article31-35application/pdfhttp://dx.doi.org/10.1017/S1751731111001376Animal. Cambridge: Cambridge Univ Press, v. 6, n. 1, p. 31-35, 2012.1751-7311http://hdl.handle.net/11449/449510.1017/S1751731111001376WOS:000299269500004WOS000299269500004.pdf5866981114947883Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengAnimal1.8700,842info:eu-repo/semantics/openAccessLaureano, M. M. M.Bignardi, A. B. [UNESP]El Faro, L.Cardoso, V. L.Albuquerque, Lucia Galvão de [UNESP]2025-10-22T11:47:53Zoai:repositorio.unesp.br:11449/4495Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestrepositoriounesp@unesp.bropendoar:29462025-10-22T11:47:53Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Genetic parameters for first lactation test-day milk flow in Holstein cows
title Genetic parameters for first lactation test-day milk flow in Holstein cows
spellingShingle Genetic parameters for first lactation test-day milk flow in Holstein cows
Laureano, M. M. M.
functional trait
Genetic correlation
Heritability
milkability
title_short Genetic parameters for first lactation test-day milk flow in Holstein cows
title_full Genetic parameters for first lactation test-day milk flow in Holstein cows
title_fullStr Genetic parameters for first lactation test-day milk flow in Holstein cows
title_full_unstemmed Genetic parameters for first lactation test-day milk flow in Holstein cows
title_sort Genetic parameters for first lactation test-day milk flow in Holstein cows
dc.creator.none.fl_str_mv Laureano, M. M. M.
Bignardi, A. B. [UNESP]
El Faro, L.
Cardoso, V. L.
Albuquerque, Lucia Galvão de [UNESP]
author Laureano, M. M. M.
author_facet Laureano, M. M. M.
Bignardi, A. B. [UNESP]
El Faro, L.
Cardoso, V. L.
Albuquerque, Lucia Galvão de [UNESP]
author_role author
author2 Bignardi, A. B. [UNESP]
El Faro, L.
Cardoso, V. L.
Albuquerque, Lucia Galvão de [UNESP]
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade Federal do Amazonas (UFAM)
Universidade Estadual Paulista (Unesp)
Agência Paulista de Tecnologia dos Agronegócios (APTA)
dc.subject.por.fl_str_mv functional trait
Genetic correlation
Heritability
milkability
topic functional trait
Genetic correlation
Heritability
milkability
description Genetic parameters for test-day milk flow (TDMF) of 2175 first lactations of Holstein cows were estimated using multiple-trait and repeatability models. The models included the direct additive genetic effect as a random effect and contemporary group (defined as the year and month of test) and age of cow at calving (linear and quadratic effect) as fixed effects. For the repeatability model, in addition to the effects cited, the permanent environmental effect of the animal was also included as a random effect. Variance components were estimated using the restricted maximum likelihood method in single- and multiple-trait and repeatability analyses. The heritability estimates for TDMF ranged from 0.23 (TDMF 6) to 0.32 (TDMF 2 and TDMF 4) in single-trait analysis and from 0.28 (TDMF 7 and TDMF 10) to 0.37 (TDMF 4) in multiple-trait analysis. In general, higher heritabilities were observed at the beginning of lactation until the fourth month. Heritability estimated with the repeatability model was 0.27 and the coefficient of repeatability for first lactation TDMF was 0.66. The genetic correlations were positive and ranged from 0.72 (TDMF 1 and 10) to 0.97 (TDMF 4 and 5). The results indicate that milk flow should respond satisfactorily to selection, promoting rapid genetic gains because the estimated heritabilities were moderate to high. Higher genetic gains might be obtained if selection was performed in the TDMF 4. Both the repeatability model and the multiple-trait model are adequate for the genetic evaluation of animals in terms of milk flow, but the latter provides more accurate estimates of breeding values.
publishDate 2012
dc.date.none.fl_str_mv 2012-01-01
2014-05-20T13:18:24Z
2014-05-20T13:18:24Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1017/S1751731111001376
Animal. Cambridge: Cambridge Univ Press, v. 6, n. 1, p. 31-35, 2012.
1751-7311
http://hdl.handle.net/11449/4495
10.1017/S1751731111001376
WOS:000299269500004
WOS000299269500004.pdf
5866981114947883
url http://dx.doi.org/10.1017/S1751731111001376
http://hdl.handle.net/11449/4495
identifier_str_mv Animal. Cambridge: Cambridge Univ Press, v. 6, n. 1, p. 31-35, 2012.
1751-7311
10.1017/S1751731111001376
WOS:000299269500004
WOS000299269500004.pdf
5866981114947883
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Animal
1.870
0,842
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 31-35
application/pdf
dc.publisher.none.fl_str_mv Cambridge University Press
publisher.none.fl_str_mv Cambridge University Press
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv repositoriounesp@unesp.br
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score 15,812455

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