Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/15972
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dc.contributor.authorDestrez, Alexandraen
dc.contributor.authorDeiss, Veroniqueen
dc.contributor.authorBelzung, Catherineen
dc.contributor.authorLee, Carolineen
dc.contributor.authorBoissy, Alainen
dc.date.accessioned2014-10-28T15:17:00Z
dc.date.issued2012en
dc.identifier.citationApplied Animal Behaviour Science, 139(3-4), p. 233-241en
dc.identifier.issn1872-9045en
dc.identifier.issn0168-1591en
dc.identifier.urihttps://hdl.handle.net/1959.11/15972en
dc.description.abstractRecent studies emphasize the role of interactions between emotions and judgment of environment to better assess affective state in animals. Diazepam offers a way to pharmacologically manipulate the affective state. This drug is generally used to reduce negative affective states, mainly by reducing fearfulness. Here we investigated whether a reduction of fearfulness through a pharmacological approach could reduce pessimistic-like judgment in lambs. We tested the effects of diazepam (0.10 mg/kg), a benzodiazepine known for its anxiolytic properties in many species, in 5-months old female lambs submitted to two experiments: the first one to assess their fear related reactions (cortisol, cardiac and behavioural measures) to isolation and suddenness tests, and the second one to assess their putative judgment bias. In experiment 1, the lambs treated with diazepam were less frightened by isolation and suddenness than the control lambs injected with vehicle, which tended to confirm the anxiolytic effect of diazepam on sheep. In experiment 2, the lambs were first trained to perform a spatial location task to test for judgment bias in sheep. This task required a go/no-go response according to the location of a bucket in a pen, with one location being reinforced positively (with a feed reward) and the other negatively (with a fan forced blower). Once trained, lambs ('n' = 16) were exposed twice (10 min and 3 h after injections) to five consecutive bucket locations: the two learnt locations plus three unrewarded, ambiguous locations set between the learnt locations. Control lambs increased their latency to approach one of the ambiguous bucket locations ('P' < 0.05), while treated lambs maintained the same latency to approach this location. This difference may reflect a bias in judgment in relation to fearfulness: treated lambs seemed to display a more positive judgment of an ambiguous event than control lambs. Reduction of fearfulness may thus induce a more positive affective state but this requires further investigation, with additional studies comparing the efficacy of the cognitive bias approach to other measures of affective state.en
dc.languageenen
dc.publisherElsevier BVen
dc.relation.ispartofApplied Animal Behaviour Scienceen
dc.titleDoes reduction of fearfulness tend to reduce pessimistic-like judgment in lambs?en
dc.typeJournal Articleen
dc.identifier.doi10.1016/j.applanim.2012.04.006en
dc.subject.keywordsHumane Animal Treatmenten
dc.subject.keywordsAnimal Growth and Developmenten
local.contributor.firstnameAlexandraen
local.contributor.firstnameVeroniqueen
local.contributor.firstnameCatherineen
local.contributor.firstnameCarolineen
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-20141016-095451en
local.publisher.placeThe Netherlandsen
local.format.startpage233en
local.format.endpage241en
local.peerreviewedYesen
local.identifier.volume139en
local.identifier.issue3-4en
local.contributor.lastnameDestrezen
local.contributor.lastnameDeissen
local.contributor.lastnameBelzungen
local.contributor.lastnameLeeen
local.contributor.lastnameBoissyen
dc.identifier.staffune-id:clee31en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:16209en
local.identifier.handlehttps://hdl.handle.net/1959.11/15972en
dc.identifier.academiclevelAcademicen
local.title.maintitleDoes reduction of fearfulness tend to reduce pessimistic-like judgment in lambs?en
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 176<br />Views: 195<br />Downloads: 0en
local.search.authorDestrez, Alexandraen
local.search.authorDeiss, Veroniqueen
local.search.authorBelzung, Catherineen
local.search.authorLee, Carolineen
local.search.authorBoissy, Alainen
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