Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/19758
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dc.contributor.authorNewton, Joanna Elizaen
dc.contributor.authorBrown, Danielen
dc.contributor.authorDominik, Sonjaen
dc.contributor.authorvan der Werf, Juliusen
dc.contributor.authorBunter, Kimen
dc.date.accessioned2016-12-21T11:58:00Z-
dc.date.created2015en
dc.date.issued2016-
dc.identifier.urihttps://hdl.handle.net/1959.11/19758-
dc.description.abstractThe successful breeding of ewes before the age of 12 months presents an opportunity to improve flock reproduction efficiency and increase returns for sheep producers. However, uptake of this practice is currently low in Australia and New Zealand. A contributing factor to this is that reproductive performance at 1 year of age is lower and more variable than in older ewes; between flocks and also from year to year. Whilst previous research has explored what factors contribute to successful reproduction at 1 year of age, there is no universally accepted measure of puberty and sexual maturity in sheep nor is there an accurate phenotypic predictor of yearling reproductive success. Although established genetic correlations between reproduction and production traits exist, reproduction has previously been analysed as a repeated records trait across parities, rather than treating first parity as a separate trait. Model studies show that genomic information offers the opportunity to select animals more accurately at younger ages. However the implications of a lower and more variable fertility rate of ewes mated prior to 1 year of age has been largely ignored. The aim of this thesis was to evaluate the impact of mating ewes prior to 1 year of age on flock genetic progress and to quantify the relationship between potential pubertal traits, yearling reproduction traits, reproduction traits at later parities and other key production traits.en
dc.languageenen
dc.titleSexual maturity and yearling reproductive performance in ewes: Genetic analysis and implications for breeding programsen
dc.typeThesis Doctoralen
dcterms.accessRightsUNE Greenen
dc.subject.keywordsAnimal Breedingen
dc.subject.keywordsAnimal Reproductionen
dc.subject.keywordsQuantitative Genetics (incl Disease and Trait Mapping Genetics)en
local.contributor.firstnameJoanna Elizaen
local.contributor.firstnameDanielen
local.contributor.firstnameSonjaen
local.contributor.firstnameJuliusen
local.contributor.firstnameKimen
local.subject.for2008070206 Animal Reproductionen
local.subject.for2008070201 Animal Breedingen
local.subject.for2008060412 Quantitative Genetics (incl Disease and Trait Mapping Genetics)en
local.subject.seo2008830311 Sheep - Woolen
local.subject.seo2008830310 Sheep - Meaten
dcterms.RightsStatementCopyright 2015 - Joanna Eliza Newtonen
dc.date.conferred2016en
local.thesis.degreelevelDoctoralen
local.thesis.degreenameDoctor of Philosophyen
local.contributor.grantorUniversity of New Englanden
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.emailjnewton9@myune.edu.auen
local.profile.emaildbrown2@une.edu.auen
local.profile.emailsdomini2@une.edu.auen
local.profile.emailjvanderw@une.edu.auen
local.profile.emailkbunter2@une.edu.auen
local.output.categoryT2en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune_thesis-20150624-11194en
local.title.subtitleGenetic analysis and implications for breeding programsen
local.access.fulltextYesen
local.contributor.lastnameNewtonen
local.contributor.lastnameBrownen
local.contributor.lastnameDominiken
local.contributor.lastnamevan der Werfen
local.contributor.lastnameBunteren
dc.identifier.staffune-id:jnewton9en
dc.identifier.staffune-id:dbrown2en
dc.identifier.staffune-id:sdomini2en
dc.identifier.staffune-id:jvanderwen
dc.identifier.staffune-id:kbunter2en
local.profile.orcid0000-0002-4786-7563en
local.profile.orcid0000-0002-1942-8539en
local.profile.orcid0000-0003-2512-1696en
local.profile.roleauthoren
local.profile.rolesupervisoren
local.profile.rolesupervisoren
local.profile.rolesupervisoren
local.profile.rolesupervisoren
local.identifier.unepublicationidune:19948en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleSexual maturity and yearling reproductive performance in ewesen
local.output.categorydescriptionT2 Thesis - Doctorate by Researchen
local.thesis.borndigitalyesen
local.search.authorNewton, Joanna Elizaen
local.search.supervisorBrown, Danielen
local.search.supervisorDominik, Sonjaen
local.search.supervisorvan der Werf, Juliusen
local.search.supervisorBunter, Kimen
local.open.fileurlhttps://rune.une.edu.au/web/retrieve/3011ed02-0671-40f7-967b-646f65249fdden
local.open.fileurlhttps://rune.une.edu.au/web/retrieve/75881671-1f1a-4f1e-8d4e-7120e54e3ea5en
local.uneassociationYesen
local.year.conferred2016en
local.fileurl.openhttps://rune.une.edu.au/web/retrieve/75881671-1f1a-4f1e-8d4e-7120e54e3ea5en
local.fileurl.openhttps://rune.une.edu.au/web/retrieve/3011ed02-0671-40f7-967b-646f65249fdden
local.subject.for2020300305 Animal reproduction and breedingen
local.subject.for2020300109 Non-genetically modified uses of biotechnologyen
local.subject.for2020310506 Gene mappingen
local.subject.seo2020100413 Sheep for woolen
local.subject.seo2020100412 Sheep for meaten
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Thesis Doctoral
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