Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/21041
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dc.contributor.authorStrucken, Evaen
dc.contributor.authorLaurenson, Yanen
dc.contributor.authorBrockmann, Gudrun Aen
local.source.editorEditor(s): Kim Bunter, Tim Byrne, Hans Daetwyler, Susanne Hermesch, Kathryn Kemper, James Kijas, David Nation, Wayne Pitchford, Suzanne Rowe, Matt Shaffer, Alison van Eenennaamen
dc.date.accessioned2017-05-23T12:34:00Z-
dc.date.issued2015-
dc.identifier.citationProceedings of the Association for the Advancement of Animal Breeding and Genetics, v.21, p. 362-365en
dc.identifier.isbn9780646945545en
dc.identifier.issn1328-3227en
dc.identifier.urihttps://hdl.handle.net/1959.11/21041-
dc.description.abstractBreeding indices have enabled farmers to select for multiple traits simultaneously, including negatively correlated traits such as milk production and fertility. This negative correlation is believed to be either caused by an energy deficit during early lactation or serves a functional purpose in providing optimal birth spacing. A linear regression was carried out between parameters describing a lactation curve and a fertility index (RZR) and milk yield EBVs (mEBVs) to determine the effects of selection on the lactation curve. Breeding values of first lactation milk yield and a RZR were available for 2,405 sires. Additionally, these sires had test-day records of the first lactation of ~2M daughters. There was a negative correlation between mEBVs and RZR (r=-0.27, P<0.0001). Selection for fertility resulted in higher initial milk yield with an early peak yield. This suggests that an early peak occurs to provide offspring with sufficient milk despite a potential energy deficit. Further, an early peak provides an increased duration over which milk production declines and therefore sufficient time for the cow to recover from the energy deficit prior to a subsequent pregnancy. Finally, current production environments could be optimised to fulfil the genetic potential of high producing dairy cows.en
dc.languageenen
dc.publisherAssociation for the Advancement of Animal Breeding and Genetics (AAABG)en
dc.relation.ispartofProceedings of the Association for the Advancement of Animal Breeding and Geneticsen
dc.titleEffects of Selection for Fertility on Lactation Curvesen
dc.typeConference Publicationen
dc.relation.conferenceAAABG 2015: 21st Conference of the Association for the Advancement of Animal Breeding and Geneticsen
dcterms.accessRightsGolden
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameEvaen
local.contributor.firstnameYanen
local.contributor.firstnameGudrun Aen
local.subject.for2008070201 Animal Breedingen
local.subject.seo2008970107 Expanding Knowledge in the Agricultural and Veterinary Sciencesen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailestrucke@une.edu.auen
local.profile.emailylaurens@une.edu.auen
local.output.categoryE1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20170316-165922en
local.date.conference28th - 30th September, 2015en
local.conference.placeLorne, Australiaen
local.publisher.placeArmidale, Australiaen
local.format.startpage362en
local.format.endpage365en
local.url.openhttp://www.aaabg.org/aaabghome/AAABG21papers/Strucken21362.pdfen
local.peerreviewedYesen
local.identifier.volume21en
local.access.fulltextYesen
local.contributor.lastnameStruckenen
local.contributor.lastnameLaurensonen
local.contributor.lastnameBrockmannen
dc.identifier.staffune-id:estruckeen
dc.identifier.staffune-id:ylaurensen
local.profile.orcid0000-0002-2715-0733en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:21234en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleEffects of Selection for Fertility on Lactation Curvesen
local.output.categorydescriptionE1 Refereed Scholarly Conference Publicationen
local.relation.urlhttp://www.aaabg.org/aaabghome/proceedings21.phpen
local.conference.detailsAAABG 2015: 21st Conference of the Association for the Advancement of Animal Breeding and Genetics, Lorne, Australia, 28th - 30th September, 2015en
local.search.authorStrucken, Evaen
local.search.authorLaurenson, Yanen
local.search.authorBrockmann, Gudrun Aen
local.uneassociationUnknownen
local.year.published2015en
local.subject.for2020300305 Animal reproduction and breedingen
local.subject.seo2020280101 Expanding knowledge in the agricultural, food and veterinary sciencesen
local.date.start2015-09-28-
local.date.end2015-09-30-
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