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Behavioural Reactivity Affected by Chronic Stress: An Experimental Approach in Calves Submitted to Environmental Instability

Published online by Cambridge University Press:  11 January 2023

A Boissy*
Affiliation:
Unité de Recherches sur les Herbivores, Institut National de la Recherche Agronomique, 63 122 Saint-Genes-Champanelle, France
I Veissier
Affiliation:
Unité de Recherches sur les Herbivores, Institut National de la Recherche Agronomique, 63 122 Saint-Genes-Champanelle, France
S Roussel
Affiliation:
Unité de Recherches sur les Herbivores, Institut National de la Recherche Agronomique, 63 122 Saint-Genes-Champanelle, France now at: Institut National de l'Agronomie - Paris Grignon, 75 231 Paris, France
*
Contact for correspondence and requests for reprints
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Abstract

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Whereas physiological and behavioural responses to acute stressors are well documented, chronic stress remains difficult to assess in farm animals. The aim of the present paper is to investigate whether calves’ behavioural reactions to acute events are modified during chronic intermittent stress. Thirty-two calves housed in pairs were used. For half of the calves the partner and the pen were changed once a week for 14 weeks (regrouped calves) while the others remained unchanged (controls). Four behavioural tests were performed to assess calves’ reactivity to novel or sudden events, to predator cues and to restraint. In the water spray test, regrouped calves were startled more often. In the umbrella test, regrouped calves took a longer time to feed in front of the closed umbrella but no differences between the two treatments were observed on opening the umbrella. In the dog test, regrouped calves moved more and looked at the dog more often. In the restraint test, regrouped calves were more agitated. These differences disappeared when the tests were repeated. In conclusion, repeated changes in the social and physical environment of calves enhances their behavioural reactivity to novelty. This is likely to make them more adaptive to potential changes in their environment.

Type
Research Article
Copyright
© 2001 Universities Federation for Animal Welfare

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