Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/17720
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dc.contributor.authorde Barbieri Etcheberry, Luisen
dc.contributor.authorHegarty, Rogeren
dc.contributor.authorOddy, Huttonen
dc.contributor.authorBarnett, Marken
dc.contributor.authorLi, Lien
dc.contributor.authorNolan, John Ven
dc.date.accessioned2015-07-28T16:33:00Z
dc.date.issued2014en
dc.identifier.citationAnimal Production Science, 54(9), p. 1243-1247en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/17720en
dc.description.abstractSheep selected for high wool growth were previously shown to exhibit higher microbial protein outflow from the rumen and higher uptake of amino nitrogen in portal blood than those selected for low wool growth. This suggests that genetic selection for wool growth may induce changes in foregut physiology. This study was undertaken to determine whether differences in digesta kinetics, especially mean retention mime (MRT), are associated with differences in fleece production between sheep with low or high estimated breeding values (EBVs) for fleece weight. Twenty mature Merino wethers with uniform EBVs for liveweight were allocated to two groups of 10 animals on the basis of high or low EBVs for yearling fleece weight. Five sheep with low-EBVs and five sheep with high-EBVs for fleece weight groups were allocated in a crossover design to low and high feeding-level treatments, which comprised a blended hay diet fed at maintenance or 1.5 times maintenance. All sheep were given single doses of chromium-mordanted fibre and cobalt-EDTA as inert, non-digestible markers. Digesta kinetics was determined by analysis of the faecal marker excretion patterns using a compartmental model. Higher feed intakes from animals fed 1.5 times maintenance were associated with higher rates of wool growth and higher masses of indigestible fibre in the gut, but reduced MRT of digesta. Although sheep with higher EBVs for fleece weight had higher wool growth rates, there was no indication that these wool growth differences were associated with differences in digesta kinetics. The lack of interaction between feeding level and genotype suggests that MRT did not contribute to genotype differences in wool growth in sheep fed restricted intakes. The differences in wool growth among commercial Merino sheep with divergent fleece weight EBVs achieved by multi-trait selection are not attributable to differences in digesta kinetics, at least when feed is not available 'ad libitum'.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAnimal Production Scienceen
dc.titleSheep of divergent genetic merit for wool growth do not differ in digesta kinetics while on restricted intakesen
dc.typeJournal Articleen
dc.identifier.doi10.1071/an14319en
dc.subject.keywordsAnimal Breedingen
dc.subject.keywordsAnimal Nutritionen
dc.subject.keywordsAnimal Growth and Developmenten
local.contributor.firstnameLuisen
local.contributor.firstnameRogeren
local.contributor.firstnameHuttonen
local.contributor.firstnameMarken
local.contributor.firstnameLien
local.contributor.firstnameJohn Ven
local.subject.for2008070204 Animal Nutritionen
local.subject.for2008070201 Animal Breedingen
local.subject.for2008070202 Animal Growth and Developmenten
local.subject.seo2008830310 Sheep - Meaten
local.subject.seo2008970106 Expanding Knowledge in the Biological Sciencesen
local.subject.seo2008830311 Sheep - Woolen
local.profile.schoolEnvironmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Science, University of New England, Trevenna Road, Armidale, NSW 2351, Australiaen
local.profile.schoolAdministrationen
local.profile.emailldebarbi@myune.edu.auen
local.profile.emailrhegart3@une.edu.auen
local.profile.emailhoddy2@une.edu.auen
local.profile.emailmbarnet3@une.edu.auen
local.profile.emaillli9@une.edu.auen
local.profile.emailjnolan@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20150708-11490en
local.publisher.placeAustraliaen
local.format.startpage1243en
local.format.endpage1247en
local.peerreviewedYesen
local.identifier.volume54en
local.identifier.issue9en
local.contributor.lastnamede Barbieri Etcheberryen
local.contributor.lastnameHegartyen
local.contributor.lastnameOddyen
local.contributor.lastnameBarnetten
local.contributor.lastnameLien
local.contributor.lastnameNolanen
dc.identifier.staffune-id:ldebarbien
dc.identifier.staffune-id:rhegart3en
dc.identifier.staffune-id:hoddy2en
dc.identifier.staffune-id:mbarnet3en
dc.identifier.staffune-id:lli9en
dc.identifier.staffune-id:jnolanen
local.profile.orcid0000-0003-1783-1049en
local.profile.orcid0000-0001-6306-7884en
local.profile.orcid0000-0001-7949-950Xen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:17931en
local.identifier.handlehttps://hdl.handle.net/1959.11/17720en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleSheep of divergent genetic merit for wool growth do not differ in digesta kinetics while on restricted intakesen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 382<br />Views: 440<br />Downloads: 3en
local.search.authorde Barbieri Etcheberry, Luisen
local.search.authorHegarty, Rogeren
local.search.authorOddy, Huttonen
local.search.authorBarnett, Marken
local.search.authorLi, Lien
local.search.authorNolan, John Ven
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