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Body weight change as a measure of stress: a practical test

Published online by Cambridge University Press:  11 January 2023

GW McLaren ,
F Mathews ,
R Fell ,
M Gelling  and
DW Macdonald
GW McLaren*
Affiliation:
Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
F Mathews
Affiliation:
Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
R Fell
Affiliation:
Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
M Gelling
Affiliation:
Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
DW Macdonald
Affiliation:
Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
*
* Contact for correspondence and requests for reprints: graeme.mclaren@zoo.ox.ac.uk
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Abstract

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We report on the efficacy of body weight change as a measure of trapping and handling stress in two species of wild small mammal: bank voles (Clethrionomys glareolus) and wood mice (Apodemus sylvaticus). We tested two hypotheses: (1) that weight change after capture and handling is related to the intensity of the trapping and handling regime, and (2) that weight change after an intensive handling regime is related to an individual's current pattern of energy expenditure. Trapped wood mice that were subjected to intensive handling (intensive stressor) lost more weight than did animals that were handled minimally (less intensive stressor), but this was not the case for bank voles. Patterns and factors related to body weight change in response to intensive handling also differed between the two species: heavier and non-breeding bank voles were more likely to lose weight, but this was not true for wood mice, and none of the factors we measured was found to affect weight loss in this species. Our results were broadly consistent with the predictions of the biological cost hypothesis. We discuss the limitations and benefits of weight loss as a measure of stress.

Keywords

animal welfarebody weighthandlingsmall mammalsstresstrapping
Type
Research Article
Information
Animal Welfare , Volume 13 , Issue 3 , August 2004 , pp. 337 - 341
Copyright
© 2004 Universities Federation for Animal Welfare

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