Genetic parameters for test-day milk yield, 305-day milk yield, and lactation length in Guzerat cows

Página do item simplificado
dc.contributor.authorSantos, D. J A [UNESP]
dc.contributor.authorPeixoto, M. G C D
dc.contributor.authorBorquis, R. R A [UNESP]
dc.contributor.authorVerneque, R. S.
dc.contributor.authorPanetto, J. C C
dc.contributor.authorTonhati, Humberto [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
dc.date.accessioned2014-05-27T11:28:45Z
dc.date.available2014-05-27T11:28:45Z
dc.date.issued2013-04-01
dc.description.abstractMilk production in tropical environments requires the use of crossbreeding systems including breeds well adapted to harsh conditions, but with lower productivities when compared to specialized breeds. Besides the genetic improvement for milk production, lactation lengths also need to be studied for most of these breeds. Accordingly, genetic parameters were estimated for 305-day cumulative milk yield (MY305), test-day milk yield (TDMY), and lactation length (LL) using information from the first lactations of 2816 Guzerat cows selected for milk production in 28 herds in Brazil. Contemporary groups were defined as herd, year and season of the test for TDMY, and as herd, year and season of calving for MY305 and LL. Variance components were estimated with the restricted maximum likelihood method under a multi-trait animal model. Heritabilities estimated for TDMY ranged from 0.16 to 0.24, and were 0.24 and 0.12 for MY305 and LL, respectively. Genetic correlations were high and positive, ranging from 0.51 to 0.99 among TDMY records, from 0.81 to 0.98 between each TDMY and MY305, and from 0.71 to 0.94 between each TDMY and LL. Genetic parameters obtained in this study indicated the possibility of using test-day records for the prediction of breeding values for milk yield in this population of the Guzerat breed. The use of TDMY as selection criteria would result in indirect gains in MY305 and LL. However, the highest response to selection for MY305 would be obtained by direct selection for this trait. © 2012 Elsevier B.V.en
dc.description.affiliationDepartamento de Zootecnia Faculdade de Ciĉncias Agrárias e Veterinárias Universidade Estadual Paulista, Acesso Prof. Paulo Donato Castelani, km 5, 14884-900 Jaboticabal, SP
dc.description.affiliationEmbrapa Gado de Leite Rua Eugĉnio do Nascimento, 610, 36.038-330, Juiz de Fora, MG
dc.description.affiliationUnespDepartamento de Zootecnia Faculdade de Ciĉncias Agrárias e Veterinárias Universidade Estadual Paulista, Acesso Prof. Paulo Donato Castelani, km 5, 14884-900 Jaboticabal, SP
dc.format.extent114-119
dc.identifierhttp://dx.doi.org/10.1016/j.livsci.2012.12.012
dc.identifier.citationLivestock Science, v. 152, n. 2-3, p. 114-119, 2013.
dc.identifier.doi10.1016/j.livsci.2012.12.012
dc.identifier.file2-s2.0-84875489727.pdf
dc.identifier.issn1871-1413
dc.identifier.lattes7445254960858159
dc.identifier.scopus2-s2.0-84875489727
dc.identifier.urihttp://hdl.handle.net/11449/74933
dc.identifier.wosWOS:000316525000002
dc.language.isoeng
dc.relation.ispartofLivestock Science
dc.relation.ispartofjcr1.204
dc.relation.ispartofsjr0,730
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectGenetic gain
dc.subjectMilk yield
dc.subjectVariance components
dc.subjectZebu
dc.subjectAnimalia
dc.subjectBos indicus
dc.titleGenetic parameters for test-day milk yield, 305-day milk yield, and lactation length in Guzerat cowsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
unesp.author.lattes7445254960858159
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt

Arquivos

Pacote Original
Agora exibindo 1 - 1 de 1
Imagem de Miniatura
Nome:
2-s2.0-84875489727.pdf
Tamanho:
239.22 KB
Formato:
Adobe Portable Document Format
Descrição:
Baixar

Coleções

Artigos - Zootecnia - FCAV