Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/19561
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dc.contributor.authorRose, Gusen
dc.contributor.authorMulder, H Aen
dc.contributor.authorThompson, A Nen
dc.contributor.authorVan Der Werf, Julius Hen
dc.contributor.authorvan Arendonk, J A Men
dc.date.accessioned2016-10-12T12:20:00Z-
dc.date.issued2015-
dc.identifier.citationAnimal, 9(8), p. 1268-1277en
dc.identifier.issn1751-732Xen
dc.identifier.issn1751-7311en
dc.identifier.urihttps://hdl.handle.net/1959.11/19561-
dc.description.abstractBreeding programmes for livestock require economic weights for traits that reflect the most profitable animal in a given production system, which affect the response in each trait after selection. The profitability of sheep production systems is affected by changes in pasture growth as well as grain, meat and wool prices between seasons and across years. Annual pasture growth varies between regions within Australia's Mediterranean climate zone from low growth with long periods of drought to high growth with shorter periods of drought. Therefore, the objective of this study was to assess whether breeding objectives need to be adapted for regions, depending on how reliable the pasture growth is across years. We modelled farms with Merino sheep bred for wool and meat in 10 regions in Western Australia. Across these 10 regions, mean annual pasture growth decreased, and the CV of annual pasture growth increased as pasture growth for regions became less reliable. We calculated economic values for nine traits, optimising management across 11 years, including variation for pasture growth and wool, meat and grain prices between and within years from 2002 to 2012. These economic values were used to calculate responses to selection for each trait for the 10 regions. We identified two potential breeding objectives, one for regions with low or high reliability and the other for regions with medium reliability of pasture growth. Breeding objectives for high or low pasture growth reliability had more emphasis on live weight traits and number of lambs weaned. Breeding objectives for medium reliability of pasture growth had more emphasis on decreasing fibre diameter. Relative economic weights for fleece weight did not change across the regions. Regions with low or high pasture reliability had similar breeding objectives and response to selection, because the relationship between the economic values and CV of pasture growth were not linear for live weight traits and the number of lambs weaned. This non-linearity was caused by differences in distribution of pasture growth between regions, particularly during summer and autumn, when ewes were pregnant, with increases in energy requirements affecting the value of lambs weaned. In addition, increasing live weight increased the intake capacity of sheep, which meant that more poor quality pasture could be consumed during summer and autumn, which had more value in regions with low and high pasture reliability. We concluded that breeding values for sheep production systems should be customised depending on the reliability of pasture growth between years.en
dc.languageenen
dc.publisherCambridge University Pressen
dc.relation.ispartofAnimalen
dc.titleBreeding objectives for sheep should be customised depending on variation in pasture growth across yearsen
dc.typeJournal Articleen
dc.identifier.doi10.1017/S1751731115000476en
dcterms.accessRightsGolden
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameGusen
local.contributor.firstnameH Aen
local.contributor.firstnameA Nen
local.contributor.firstnameJulius Hen
local.contributor.firstnameJ A Men
local.subject.for2008070201 Animal Breedingen
local.subject.seo2008830310 Sheep - Meaten
local.subject.seo2008830311 Sheep - Woolen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailjvanderw@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20160502-102953en
local.publisher.placeUnited Kingdomen
local.format.startpage1268en
local.format.endpage1277en
local.identifier.scopusid84937522953en
local.peerreviewedYesen
local.identifier.volume9en
local.identifier.issue8en
local.access.fulltextYesen
local.contributor.lastnameRoseen
local.contributor.lastnameMulderen
local.contributor.lastnameThompsonen
local.contributor.lastnameVan Der Werfen
local.contributor.lastnamevan Arendonken
dc.identifier.staffune-id:jvanderwen
local.profile.orcid0000-0003-2512-1696en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:19751en
dc.identifier.academiclevelAcademicen
local.title.maintitleBreeding objectives for sheep should be customised depending on variation in pasture growth across yearsen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorRose, Gusen
local.search.authorMulder, H Aen
local.search.authorThompson, A Nen
local.search.authorVan Der Werf, Julius Hen
local.search.authorvan Arendonk, J A Men
local.uneassociationUnknownen
local.year.published2015en
local.subject.for2020300305 Animal reproduction and breedingen
local.subject.seo2020100412 Sheep for meaten
local.subject.seo2020100413 Sheep for woolen
Appears in Collections:Journal Article
School of Environmental and Rural Science
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