Genetic parameters of total milk yield and factors describing the shape of lactation curve in dairy buffaloes

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dc.contributor.authorAspilcueta-Borquis, Rusbel R. [UNESP]
dc.contributor.authorBaldi, Fernando [UNESP]
dc.contributor.authorAraujo Neto, Francisco R. [UNESP]
dc.contributor.authorAlbuquerque, Lucia Galvão de [UNESP]
dc.contributor.authorMunoz-Berrocal, Milthon
dc.contributor.authorTonhati, Humberto [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionConselho Nacional de Desenvolvimento Científico & Tecnológico (CNPq)
dc.contributor.institutionInstituto Nacional de Ciência e Tecnologia de Ciência Animal (INCT-CA)
dc.contributor.institutionUniversidad Nacional Agraria de la Selva (UNAS)
dc.date.accessioned2014-05-20T13:19:11Z
dc.date.available2014-05-20T13:19:11Z
dc.date.issued2012-02-01
dc.description.abstractThe objective of this study was to apply factor analysis to describe lactation curves in dairy buffaloes in order to estimate the phenotypic and genetic association between common latent factors and cumulative milk yield. A total of 31 257 monthly test-day milk yield records from buffaloes belonging to herds located in the state of São Paulo were used to estimate two common latent factors, which were then analysed in a multi-trait animal model for estimating genetic parameters. Estimates of (co)variance components for the two common latent factors and cumulated 270-d milk yield were obtained by Bayesian inference using a multiple trait animal model. Contemporary group, number of milkings per day (two levels) and age of buffalo cow at calving (linear and quadratic) as covariate were included in the model as fixed effects. The additive genetic, permanent environmental and residual effects were included as random effects. The first common latent factor (F1) was associated with persistency of lactation and the second common latent factor (F2) with the level of production in early lactation. Heritability estimates for Fl and F2 were 0.12 and 0.07, respectively. Genetic correlation estimates between El and F2 with cumulative milk yield were positive and moderate (0.63 and 0.52). Multivariate statistics employing factor analysis allowed the extraction of two variables (latent factors) that described the shape of the lactation curve. It is expected that the response to selection to increase lactation persistency is higher than the response obtained from selecting animals to increase lactation peak. Selection for higher total milk yield would result in a favourable correlated response to increase the level of production in early lactation and the lactation persistency.en
dc.description.affiliationSão Paulo State Univ FCAV UNESP, Dept Anim Sci, BR-14884900 Jaboticabal, SP, Brazil
dc.description.affiliationConselho Nacl Desenvolvimento Cient & Tecnol CNPq, BR-36570000 Vicosa, MG, Brazil
dc.description.affiliationINCT CA, BR-36570000 Vicosa, MG, Brazil
dc.description.affiliationUniv Nacl Agr Selva, UNAS Tingo Maria, Peru
dc.description.affiliationUnespSão Paulo State Univ FCAV UNESP, Dept Anim Sci, BR-14884900 Jaboticabal, SP, Brazil
dc.format.extent60-65
dc.identifierhttp://dx.doi.org/10.1017/S0022029911000823
dc.identifier.citationJournal of Dairy Research. New York: Cambridge Univ Press, v. 79, n. 1, p. 60-65, 2012.
dc.identifier.doi10.1017/S0022029911000823
dc.identifier.fileWOS000300033100009.pdf
dc.identifier.issn0022-0299
dc.identifier.lattes7445254960858159
dc.identifier.lattes5866981114947883
dc.identifier.urihttp://hdl.handle.net/11449/4963
dc.identifier.wosWOS:000300033100009
dc.language.isoeng
dc.publisherCambridge University Press
dc.relation.ispartofJournal of Dairy Research
dc.relation.ispartofjcr1.170
dc.relation.ispartofsjr0,573
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectMultivariate analysisen
dc.subjectGibbs sampleren
dc.subjectBuffaloesen
dc.subjectGenetic parameteren
dc.subjectMilk yielden
dc.titleGenetic parameters of total milk yield and factors describing the shape of lactation curve in dairy buffaloesen
dc.typeArtigo
dcterms.licensehttp://journals.cambridge.org/action/displaySpecialPage?pageId=4676#
dcterms.rightsHolderCambridge Univ Press
unesp.author.lattes7445254960858159
unesp.author.lattes5866981114947883
unesp.author.orcid0000-0002-2030-7590[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt

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