Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/16796
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dc.contributor.authorNewton, Jo Een
dc.contributor.authorBrown, Danielen
dc.contributor.authorDominik, Sonjaen
dc.contributor.authorVan Der Werf, Julius Hen
dc.date.accessioned2015-03-23T15:04:00Z-
dc.date.issued2014-
dc.identifier.citationAnimal Production Science, 54(6), p. 753-761en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/16796-
dc.description.abstractThe aims of this study were to quantify the relationship between age of first oestrus and yearling reproductive performance in maternal-cross ewes in the Information Nucleus Flock data and to estimate genetic and phenotypic correlations between early and later reproductive performance defined as three ages, yearling, hogget and adult in both Merino and maternal-cross ewes. Information on 2218 yearling records, 2047 hogget records and 910 age of first oestrus records were used in the analysis of maternal-cross ewes, whereas 3286 hogget and 2518 adult reproductive records were used in analysis of Merino ewes. Heritability estimates for yearling reproductive performance in maternal-cross ewes ranged from 0.08 ± 0.09 for ewe fecundity to 0.16 ± 0.05 for number of lambs born and were generally higher than hogget heritability estimates for both maternal-cross and Merino ewes. Age at first oestrus was found to have a low heritability, 0.02 with standard errors of 0.07 and 0.06 with and without weight fitted as a covariate. Genetic correlations between age at first oestrus with and without weight fitted as a covariate and yearling reproductive performance were positive, ranging from 0.07 ± 0.49 with lamb survival to 0.94 ± 0.39 with number of lambs born, which was unexpected. Correlations between traits from the same age class were high in both breed groups. Genetic correlations between yearling and hogget performance in maternal-cross ewes were generally lower than one, ranging from 0.46 ± 0.68 for lamb survival and 0.79 ± 0.50 for fertility suggesting that yearling and later reproductive performance are related but genetically different traits. In Merino ewes, the genetic correlations between hogget and adult performance followed a similar pattern. The small number of records in this study generated high standard errors for estimates, which restricts the conclusions that can be drawn. Overall, this study supports current practice used by 'Sheep Genetics', the Australian genetic evaluation system for sheep, in considering yearling reproductive performance as a trait separate from later parities for genetic evaluation purposes.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAnimal Production Scienceen
dc.titleGenetic and phenotypic parameters between yearling, hogget and adult reproductive performance and age of first oestrus in sheepen
dc.typeJournal Articleen
dc.identifier.doi10.1071/AN13245en
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameJo Een
local.contributor.firstnameDanielen
local.contributor.firstnameSonjaen
local.contributor.firstnameJulius Hen
local.subject.for2008070201 Animal Breedingen
local.subject.seo2008830311 Sheep - Woolen
local.subject.seo2008830310 Sheep - Meaten
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolAnimal Genetics and Breeding Uniten
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailjnewto22@une.edu.auen
local.profile.emaildbrown2@une.edu.auen
local.profile.emailsdomini2@une.edu.auen
local.profile.emailjvanderw@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20150227-154256en
local.publisher.placeAustraliaen
local.format.startpage753en
local.format.endpage761en
local.identifier.scopusid84899867112en
local.peerreviewedYesen
local.identifier.volume54en
local.identifier.issue6en
local.contributor.lastnameNewtonen
local.contributor.lastnameBrownen
local.contributor.lastnameDominiken
local.contributor.lastnameVan Der Werfen
dc.identifier.staffune-id:jnewto22en
dc.identifier.staffune-id:dbrown2en
dc.identifier.staffune-id:sdomini2en
dc.identifier.staffune-id:jvanderwen
local.profile.orcid0000-0002-2686-3336en
local.profile.orcid0000-0002-1942-8539en
local.profile.orcid0000-0003-2512-1696en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:17031en
local.identifier.handlehttps://hdl.handle.net/1959.11/16796en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleGenetic and phenotypic parameters between yearling, hogget and adult reproductive performance and age of first oestrus in sheepen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorNewton, Jo Een
local.search.authorBrown, Danielen
local.search.authorDominik, Sonjaen
local.search.authorVan Der Werf, Julius Hen
local.uneassociationUnknownen
local.year.published2014en
local.subject.for2020300305 Animal reproduction and breedingen
local.subject.seo2020100413 Sheep for woolen
local.subject.seo2020100412 Sheep for meaten
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
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