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Middle-aged mice with enrichment-resistant stereotypic behaviour show reduced motivation for enrichment.

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dc.contributor.author Mason, G.J.
dc.contributor.author Tilly, S.C.
dc.contributor.author Dallaire, J.
dc.date.accessioned 2012-12-20T20:13:57Z
dc.date.available 2012-12-20T20:13:57Z
dc.date.issued 2010
dc.identifier.uri http://hdl.handle.net/10214/4954
dc.description.abstract For captive animals, living in barren conditions leads to stereotypic behaviour that is hard to alleviate using environmental enrichment. This resistance to enrichment is often explained via mechanisms that decouple abnormal behaviour from current welfare, such as ‘establishment’: a hypothetical process whereby repetition increases behaviour’s predictability and resistance to change. If such hypotheses are correct, then animals with enrichment-resistant stereotypic behaviour should still find enrichments rewarding. Alternatively, this behaviour could reflect a failure to improve welfare: plausible because age and chronic stress increase neophobia and anhedonia. If this hypothesis is correct, animals with enrichment-resistant stereotypic behaviour should value enrichments less than conspecifics.We tested these hypotheses using C57BL/6 mice, Mus musculus, aged 10-11 and 6-7 months, raised in barren laboratory cages. We observed their behaviour in both these and large enriched cages. Enrichment was more effective on the younger animals. However, contrary to ideas about establishment, the spontaneous predictability of stereotypic behaviour did not increase with age; nor was enrichment less effective on more predictable or time consuming forms. We assessed the reward value of enriched cages by allowing access via progressively weighted doors (maximum weight pushed corresponding to peak motivation). In older mice, those individuals whose stereotypic behaviour was least reduced by enrichment were also the least motivated to gain access to enrichment. This suggests that the welfare of middle aged-animals, as well as their stereotypic behaviour, is harder to improve using environmental enrichment. en_US
dc.language.iso en en_US
dc.publisher Animal Behaviour en_US
dc.subject age en_US
dc.subject animal welfare en_US
dc.subject enrichment en_US
dc.subject establishment en_US
dc.subject laboratory mice en_US
dc.subject motivation en_US
dc.subject Mus musculus en_US
dc.subject reward value en_US
dc.subject stereotypic behaviour en_US
dc.title Middle-aged mice with enrichment-resistant stereotypic behaviour show reduced motivation for enrichment. en_US
dc.type Article en_US
dc.contributor.affiliation Department of Animal and Poultry Science
dc.rights.license All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dcterms.relation S. C. Tilly, J. Dallaire & G. J. Mason (2010). Middle-aged mice with enrichment-resistant stereotypic behaviour show reduced motivation for enrichment. Animal Behaviour 80: 363-373.


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