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Stress measures in tail biters and bitten pigs in a matched case-control study

Published online by Cambridge University Press:  01 January 2023

C Munsterhjelm ,
E Brunberg ,
M Heinonen ,
L Keeling  and
A Valros
C Munsterhjelm*
Affiliation:
PB 57, FIN-00014 University of Helsinki, Finland Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Uppsala, Sweden
E Brunberg
Affiliation:
Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Uppsala, Sweden
M Heinonen
Affiliation:
University of Helsinki, Faculty of Veterinary Medicine, Department of Production Animal Medicine, Helsinki, Finland
L Keeling
Affiliation:
Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Uppsala, Sweden
A Valros
Affiliation:
University of Helsinki, Faculty of Veterinary Medicine, Department of Production Animal Medicine, Helsinki, Finland
*
* Contact for correspondence and requests for reprints: [email protected]
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Abstract

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This study aimed to identify differences in stress measures in pigs (Sus scrofa) with different roles during a tail-biting outbreak. Quartets (n = 16) of age- and gender-matched fattening pigs including a tail biter (TB; n = 16), a victim (V; n = 16), a control in the same pen (Ctb; n = 10), and one in a pen without tail biting (Cno; n = 14) were chosen by direct behavioural observation. Stress measures used were behaviour (dog-sitting, sniffing of pen-mates and aggression), thyroid hormone concentration, morphology of adrenal and thyroid glands and salivary cortisol concentration sampled at 0700, 1000, 1600 and 1900h. Category (TB, V, Ctb, Cno) effects were investigated using a mixed model with replicate as subject and category as repeated effect. Category had a significant effect on adrenal total (cortex + medulla) and cortical area, salivary cortisol at 1900h, serum triiodothyronine (T3) and the behaviours performing and receiving sniffing. Victims suffered from a triad of chronic stress, pathology and suppressed T3 secretion. Evidence for stress in tail biters, a possible cause of the behaviour, consisted of a slightly flattened day-time cortisol pattern and more performed sniffing than all other categories. Differences in evening cortisol concentration and T3 levels between the categories in the pen with ongoing tail biting emphasise the qualities of the control animal. It supports the view that neutral pigs represent a phenotype that adopts a coping strategy leading to lower stress levels than in tail biters and victims, despite being housed in the same pen.

Keywords

adrenalanimal welfareinjurious behaviourphysiologyswinethyroid
Type
Research Article
Information
Animal Welfare , Volume 22 , Issue 3 , August 2013 , pp. 331 - 338
Copyright
© 2013 Universities Federation for Animal Welfare

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