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Wild boar behaviour during live-trap capture in a corral-style trap: implications for animal welfare

Fahlman, Åsa and Lindsjö, Johan and Norling, Therese Arven and Kjellander, Petter and Ågren, Erik Olof and Alm Bergvall, Ulrika (2020). Wild boar behaviour during live-trap capture in a corral-style trap: implications for animal welfare. Acta Veterinaria Scandinavica. 62 , 59
[Journal article]

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Abstract

Background Wildlife traps are used in many countries without evaluation of their effect on animal welfare. Trap-capture of wild animals should minimise negative effects on animal welfare, irrespective of whether the animals are trapped for hunting, research, or management purposes. Live-trap capture of wild boar (Sus scrofa) followed by killing inside the trap by gunshot is a recently introduced but disputed hunting method in Sweden. Approval of trap constructions is based on gross necropsy findings of 20 trapped and shot wild boars. For improved animal welfare evaluation, our aim was to study wild boar behaviour during live-trapping in a 16 m(2) square corral-style trap. Behavioural assessments were conducted after filming 12 capture events of in total 38 wild boars (five adults, 20 subadults, 13 piglets). Selected behavioural traits were compared with pathological changes (trap-related lesions) found at necropsy of the 20 subadults, to determine if these variables were useful proxies of capture-induced stress in wild boar. Results The wild boars spent less time resting in the evening than in the night and morning. Using Friedman's ANOVA, there was an overall difference in the time spent foraging. However, we only found a difference between the evening and morning in the Wilcoxon matched pairs test after the Sequential Bonferroni correction, where the wild boars spent more time foraging in the evening than in the morning. Single captured individuals showed more escape behaviours and reacted more strongly to external stimuli than individuals captured in a group. It was more common for animals to charge against the mesh walls of the trap upon human approach compared to upon initial capture when the trap door closed. Trap-related pathological findings due to trauma were documented in 13 of the 20 subadults that were necropsied. Behavioural alterations indicative of capture-induced stress (e.g. charging into the trap walls) were documented in trapped wild boars with no or minor physical injuries (e.g. skin abrasions, subcutaneous haemorrhage). Conclusions Behavioural assessment provided valuable information for determination of capture-induced stress in wild boar when evaluating live-trapping in a corral-style trap, whereas pathological evaluation through necropsy did not fully reflect the animal welfare aspects of live-trapping. We emphasize the inclusion of species-specific behavioural data assessment for evaluation of capture-related stress during live-trapping and for testing of new trap constructions before approval.

Authors/Creators:Fahlman, Åsa and Lindsjö, Johan and Norling, Therese Arven and Kjellander, Petter and Ågren, Erik Olof and Alm Bergvall, Ulrika
Title:Wild boar behaviour during live-trap capture in a corral-style trap: implications for animal welfare
Series Name/Journal:Acta Veterinaria Scandinavica
Year of publishing :2020
Volume:62
Article number:59
Number of Pages:11
Publisher:BMC
ISSN:0044-605X
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Clinical Science
Keywords:Ethogram, Health, Hunting, Management, Refinement, Stress, Sus scrofa, 3R, Trapping, Wildlife
URN:NBN:urn:nbn:se:slu:epsilon-p-109045
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109045
Additional ID:
Type of IDID
DOI10.1186/s13028-020-00557-9
Web of Science (WoS)000588101000001
ID Code:21732
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
VH - Faculty of Veterinary Medicine and Animal Science
S - Faculty of Forest Sciences
Department:(NL, NJ) > Swedish Biodiversity Centre
(VH) > Dept. of Animal Environment and Health
(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:25 Jan 2021 14:03
Metadata Last Modified:25 Jan 2021 14:11

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