Please use this identifier to cite or link to this item: https://une.intersearch.com.au/unejspui/handle/1959.11/705
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dc.contributor.authorBrown, Den
dc.contributor.authorReverter, Aen
dc.date.accessioned2008-07-30T14:47:00Z
dc.date.issued2002en
dc.identifier.citationLivestock Production Science, 75(3), p. 281-291en
dc.identifier.issn0301-6226en
dc.identifier.urihttps://hdl.handle.net/1959.11/705en
dc.description.abstractSheep performance data are routinely adjusted to account for systematic environmental effects but little attention has been given to the choice between the methods available. This study compares methods to adjust liveweight measurements for individual age (within group regression vs. age intercept) and age of dam (dam age class vs. quadratic polynomial on dam age) and fat and eye muscle depth for liveweight (within group regression vs. quadratic polynomial on weight). Criteria for comparison included: (1) changes in phenotypic variance and heritability estimates; (2) predictive ability of resulting estimated breeding values (EBVs); (3) correlation between adjusted and adjustor variables; and (4) ease of computation. With the exception of dam age adjustment of liveweight, adjustment methods did not influence the phenotypic variance of the trait being adjusted. Increases in the direct heritability were observed for liveweight adjusted using the age intercept, dam age class and quadratic methods, and fat depth using quadratic adjustment for liveweight. Within group regression based adjustments generally resulted in a reduction of direct heritability. Maternal heritability and permanent environment due to dam were unaffected by the adjustment methods utilised. The regression of progeny performance on sire estimated breeding value also indicated that the age intercept produced estimated breeding values that were closer to the expectation than those using the within group regression adjustment. The age intercept and quadratic polynomial methods of adjustment appear to be slightly more appropriate for genetic evaluation purposes.en
dc.languageenen
dc.publisherElsevier Science B.V.en
dc.relation.ispartofLivestock Production Scienceen
dc.titleA Comparison of Methods to Pre-adjust Data for Systematic Environmental Effects in Genetic Evaluation of Sheepen
dc.typeJournal Articleen
dc.identifier.doi10.1016/S0301-6226(01)00326-8en
dcterms.accessRightsUNE Greenen
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameDen
local.contributor.firstnameAen
local.subject.for2008070201 Animal Breedingen
local.subject.seo630101 Sheep - meaten
local.profile.schoolAnimal Genetics and Breeding Uniten
local.profile.schoolAnimal Genetics and Breeding Uniten
local.profile.emaildbrown2@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordpes:68en
local.publisher.placeAmsterdam, The Netherlandsen
local.format.startpage281en
local.format.endpage291en
local.peerreviewedYesen
local.identifier.volume75en
local.identifier.issue3en
local.access.fulltextYesen
local.contributor.lastnameBrownen
local.contributor.lastnameReverteren
dc.identifier.staffune-id:dbrown2en
dc.identifier.staffune-id:areverteen
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:718en
dc.identifier.academiclevelAcademicen
local.title.maintitleA Comparison of Methods to Pre-adjust Data for Systematic Environmental Effects in Genetic Evaluation of Sheepen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 132<br />Views: 119<br />Downloads: 14en
Appears in Collections:Journal Article
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