Variance Components and Genetic Parameter Estimates Using Random Regression Models on Test Day Milk Yields of Holstein Friesians

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dc.contributor.authorTakma, Cigdem
dc.contributor.authorAkbas, Yavuz
dc.date.accessioned2019-10-27T20:21:16Z
dc.date.available2019-10-27T20:21:16Z
dc.date.issued2009
dc.departmentEge Üniversitesien_US
dc.description.abstractGenetic parameters for test day milk yields of Holstein Friesian cows were estimated by random regression with Legendre polynomials The analyzes were applied to 5918 first lactation test day milk yields of 612 Holstein Friesian cows calving from 1987 to 1993 in Dalaman. Tahirova, Sarimsakli and Turkgeldi State Farms Estimated genetic variances for test day milk yields were larger at extremes of the lactation. Permanent environmental variances mostly decreased in middle part of the lactation. The heritability values for test day milk yields were from 0.26 to 0.57. The genetic correlations between test day milk yields (TD1-TD9) with the last test day milk yield (TD10) were changed from -0.10 to 0.96 and it was high between consecutive test day milk yields, but decreased when the intervals between the test days increased. In random regression models it can be concluded that higher order polynomials were recommended for a sufficient fit of the (co)variance structures over the lactation but a reduction of the orders can also be used for computational simplicity due to small numbers of parameters.en_US
dc.identifier.endpage551en_US
dc.identifier.issn1300-6045
dc.identifier.issue4en_US
dc.identifier.startpage547en_US
dc.identifier.urihttps://hdl.handle.net/11454/41741
dc.identifier.volume15en_US
dc.identifier.wosWOS:000271098600011en_US
dc.identifier.wosqualityQ4en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakTR-Dizinen_US
dc.language.isoenen_US
dc.publisherKafkas Univ, Veteriner Fakultesi Dergisien_US
dc.relation.ispartofKafkas Universitesi Veteriner Fakultesi Dergisien_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectLegendre polynomialen_US
dc.subjectVariance componenten_US
dc.subjectGenetic parameteren_US
dc.titleVariance Components and Genetic Parameter Estimates Using Random Regression Models on Test Day Milk Yields of Holstein Friesiansen_US
dc.typeArticleen_US

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