Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/18924
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dc.contributor.authorCowley, Franen
dc.contributor.authorBarber, D Gen
dc.contributor.authorHoulihan, AVen
dc.contributor.authorPoppi, D Pen
dc.date.accessioned2016-04-22T16:58:00Z-
dc.date.issued2015-
dc.identifier.citationJournal of Dairy Science, 98(4), p. 2356-2368en
dc.identifier.issn1525-3198en
dc.identifier.issn0022-0302en
dc.identifier.urihttps://hdl.handle.net/1959.11/18924-
dc.description.abstractThe effects of heat stress on dairy production can be separated into 2 distinct causes: those effects that are mediated by the reduced voluntary feed intake associated with heat stress, and the direct physiological and metabolic effects of heat stress. To distinguish between these, and identify their effect on milk protein and casein concentration, mid-lactation Holstein-Friesian cows (n = 24) were housed in temperature-controlled chambers and either subjected to heat stress [HS; temperature- humidity index (THI) ~78] or kept in a THI < 70 environment and pair-fed with heat-stressed cows (TN-R) for 7 d. A control group of cows was kept in a THI < 70 environment with ad libitum feeding (TNAL). A subsequent recovery period (7 d), with THI < 70 and ad libitum feeding followed. Intake accounted for only part of the effects of heat stress. Heat stress reduced the milk protein concentration, casein number, and casein concentration and increased the urea concentration in milk beyond the effects of restriction of intake. Under HS, the proportion in total casein of αS1-casein increased and the proportion of αS2-casein decreased. Because no effect of HS on milk fat or lactose concentration was found, these effects appeared to be the result of specific downregulation of mammary protein synthesis, and not a general reduction in mammary activity. No residual effects were found of HS or TN-R on milk production or composition after THI < 70 and ad libitum intake were restored. Heat-stressed cows had elevated blood concentrations of urea and Ca, compared with TN-R and TN-AL. Cows in TN-R had higher serum nonesterified fatty acid concentrations than cows in HS. It was proposed that HS and TN-R cows may mobilize different tissues as endogenous sources of energy.en
dc.languageenen
dc.publisherElsevier Incen
dc.relation.ispartofJournal of Dairy Scienceen
dc.titleImmediate and residual effects of heat stress and restricted intake on milk protein and casein composition and energy metabolismen
dc.typeJournal Articleen
dc.identifier.doi10.3168/jds.2014-8442en
dc.subject.keywordsAnimal Managementen
dc.subject.keywordsAnimal Nutritionen
local.contributor.firstnameFranen
local.contributor.firstnameD Gen
local.contributor.firstnameAVen
local.contributor.firstnameD Pen
local.subject.for2008070204 Animal Nutritionen
local.subject.for2008070203 Animal Managementen
local.subject.seo2008830302 Dairy Cattleen
local.subject.seo2008830507 Unprocessed or Minimally Processed Milken
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailfcowley@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20160421-123946en
local.publisher.placeUnited States of Americaen
local.format.startpage2356en
local.format.endpage2368en
local.identifier.scopusid84925328873en
local.peerreviewedYesen
local.identifier.volume98en
local.identifier.issue4en
local.contributor.lastnameCowleyen
local.contributor.lastnameBarberen
local.contributor.lastnameHoulihanen
local.contributor.lastnamePoppien
dc.identifier.staffune-id:fcowleyen
local.profile.orcid0000-0002-6475-1503en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:19125en
dc.identifier.academiclevelAcademicen
local.title.maintitleImmediate and residual effects of heat stress and restricted intake on milk protein and casein composition and energy metabolismen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorCowley, Franen
local.search.authorBarber, D Gen
local.search.authorHoulihan, AVen
local.search.authorPoppi, D Pen
local.uneassociationUnknownen
local.year.published2015en
local.subject.for2020300303 Animal nutritionen
local.subject.for2020300302 Animal managementen
local.subject.seo2020100402 Dairy cattleen
local.subject.seo2020100606 Unprocessed or minimally processed milken
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