Estimation of breeding values for dairy cattle using test-day milk yields

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dc.contributor.authorKaya, I
dc.contributor.authorAkbas, Y
dc.contributor.authorUzmay, C
dc.date.accessioned2019-10-27T18:42:14Z
dc.date.available2019-10-27T18:42:14Z
dc.date.issued2003
dc.departmentEge Üniversitesien_US
dc.description.abstractThe objectives of this study were to estimate genetic parameters and breeding values for test-day (TD) and 305-day milk yields, and to compare the results from TD and 305-day analyses. The data comprised 10,822 TD records from 1103 first lactations of Holstein cows from state farms in the western part of Turkey. Additive genetic, residual and permanent environmental variances, heritabilities and breeding values for 305-day and TD milk yields were estimated by the REML method using animal models. The heritability estimate (0.11) of TD milk yields was lower than the corresponding estimate (0.25) for 305-day milk yields. The product-moment correlations (greater than or equal to 0.97) show that estimated breeding values (EBVs) for TD milk yields are closely correlated with EBVs for 305-day milk yields. Spearman and Kendall rank correlations between rankings of animals for EBVs for TD and 305-day milk yields were also high (greater than or equal to0.97 and greater than or equal to0.86, respectively). Shifts in rank for various top lists of cows and sires ranked by their EBVs for 305-day and TD milk yields show that more extreme changes in ranks occurred in cows than in sires. TD milk yields could be used instead of 305-day milk yield for the genetic evaluation of dairy cattle. Furthermore, using TD yields for genetic evaluations offers more advantages.en_US
dc.identifier.endpage464en_US
dc.identifier.issn1300-0128
dc.identifier.issn1300-0128en_US
dc.identifier.issue2en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.startpage459en_US
dc.identifier.urihttps://hdl.handle.net/11454/37098
dc.identifier.volume27en_US
dc.identifier.wosWOS:000183347500027en_US
dc.identifier.wosqualityQ4en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherScientific Technical Research Council Turkey-Tubitaken_US
dc.relation.ispartofTurkish Journal of Veterinary & Animal Sciencesen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectdairy cattleen_US
dc.subjectbreeding valueen_US
dc.subjecttest-day milk yieldsen_US
dc.subjecttest-day modelen_US
dc.titleEstimation of breeding values for dairy cattle using test-day milk yieldsen_US
dc.typeArticleen_US

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