Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/15930
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dc.contributor.authorDestreza, Alexandraen
dc.contributor.authorDeiss, Veroniqueen
dc.contributor.authorLevy, Fredericen
dc.contributor.authorCalandreau, Ludovicen
dc.contributor.authorLee, Carolineen
dc.contributor.authorChaillou-Sagon, Elodieen
dc.contributor.authorBoissy, Alainen
dc.date.accessioned2014-10-27T09:16:00Z-
dc.date.issued2013-
dc.identifier.citationApplied Animal Behaviour Science, 148(1-2), p. 28-36en
dc.identifier.issn1872-9045en
dc.identifier.issn0168-1591en
dc.identifier.urihttps://hdl.handle.net/1959.11/15930-
dc.description.abstractChronic stress can be described as a long-term negative affective state induced by an accumulation of negative emotional experiences that alters an individual's interactions with the environment. In humans, chronic stress induces both persistent judgment biases and learning deficits. We investigated whether similar cognitive biases could occur in sheep. Twenty-four lambs were subjected to a chronic stress treatment for 9 weeks (exposure to various unpredictable, uncontrollable and aversive events regularly encountered in ordinary agricultural practices) and 24 other lambs were used as a control group. Before treatment all the lambs had been trained to approach or avoid a food bucket depending on its location. After treatment, the lambs were individually exposed to two tests: (i) a food bucket approach/avoidance test, by testing the response of lambs to ambiguous locations of the bucket, i.e. a judgment bias test, (ii) a learning test consisting of training on six consecutive days to distinguish between two visual stimuli differing in their color and shape (acquisition phase) and re-exposure to the test conditions 2 days after the end of the acquisition phase (recall phase). In the judgment bias test, treated lambs took longer to approach the ambiguous locations of the bucket. During the learning test, treated lambs had lower numbers of correct choices than control lambs in the acquisition and recall phase. Hence sheep experiencing repeated aversive events demonstrated pessimistic-like judgment biases and learning deficits. These may be useful measures to assess long-term emotional states in animals.en
dc.languageenen
dc.publisherElsevier BVen
dc.relation.ispartofApplied Animal Behaviour Scienceen
dc.titleChronic stress induces pessimistic-like judgment and learning deficits in sheepen
dc.typeJournal Articleen
dc.identifier.doi10.1016/j.applanim.2013.07.016en
dc.subject.keywordsHumane Animal Treatmenten
dc.subject.keywordsAnimal Growth and Developmenten
local.contributor.firstnameAlexandraen
local.contributor.firstnameVeroniqueen
local.contributor.firstnameFredericen
local.contributor.firstnameLudovicen
local.contributor.firstnameCarolineen
local.contributor.firstnameElodieen
local.contributor.firstnameAlainen
local.subject.for2008070207 Humane Animal Treatmenten
local.subject.for2008070202 Animal Growth and Developmenten
local.subject.seo2008830310 Sheep - Meaten
local.subject.seo2008830311 Sheep - Woolen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailclee31@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20141016-093346en
local.publisher.placeNetherlandsen
local.format.startpage28en
local.format.endpage36en
local.peerreviewedYesen
local.identifier.volume148en
local.identifier.issue1-2en
local.contributor.lastnameDestrezaen
local.contributor.lastnameDeissen
local.contributor.lastnameLevyen
local.contributor.lastnameCalandreauen
local.contributor.lastnameLeeen
local.contributor.lastnameChaillou-Sagonen
local.contributor.lastnameBoissyen
dc.identifier.staffune-id:clee31en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:16167en
local.identifier.handlehttps://hdl.handle.net/1959.11/15930en
dc.identifier.academiclevelAcademicen
local.title.maintitleChronic stress induces pessimistic-like judgment and learning deficits in sheepen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorDestreza, Alexandraen
local.search.authorDeiss, Veroniqueen
local.search.authorLevy, Fredericen
local.search.authorCalandreau, Ludovicen
local.search.authorLee, Carolineen
local.search.authorChaillou-Sagon, Elodieen
local.search.authorBoissy, Alainen
local.uneassociationUnknownen
local.year.published2013en
local.subject.for2020300306 Animal welfareen
local.subject.for2020300301 Animal growth and developmenten
local.subject.seo2020100412 Sheep for meaten
local.subject.seo2020100413 Sheep for woolen
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