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Beneficial effects of environmental enrichment on emotional reactivity of Japanese quail submitted to repeated negative stimulations

Abstract : We investigated interactions between environmental enrichment (EE) and repeated negative stimulations (RNS) during the ontogeny of Japanese quail. Half of the treated individuals (set T, N=30) and half of the control animals (set C, N=28) were housed in enriched cages (set E), whereas the other halves were housed in traditional cages (set NE). Treated individuals were submitted to RNS for two weeks (4 to 5 stimulations per 24 h). All subjects were observed in their home cages during the stimulation procedure, and then were presented emotional reactivity tests. When data were normally distributed, analysis was performed using a two-way ANOVA which examined the main effects of EE and RNS and their interactions; otherwise data were analyzed with Mann-Whitney U-tests for each factor independently. During the stimulations procedure, T quail preened less frequently than C quail, independently of cage type (10th day: set C: 13.10±0.02%, set T: 8.8±0.01%, ANOVA, RNS effect, P=0.01). E-T quail were observed more frequently in the rear zone of their cage than were E-C quails when the experimenter was in sight (10th day: set C: 11.4±3.3%, set T: 31.4±7.6%, Mann-Whitney U-test: P=0.03). The stimulation procedure affected the emotional reactivity of the quail in relation to cage type: E-T quail were less reactive than were NE-T quail (i.e. number of steps in open-field test, set NE-T: 66±21, set E-T: 138±32, Mann-Whitney U-test: P=0.05). We evidenced an interaction between the two tested factors: negative stimulations inhibited dust bathing in NE quails whereas they enhanced it in E quails (i.e. dust bathing latency in emergence test, ANOVA, interaction between EE and RNS: P=0.003, set NE-T: 139±12 s, set E-T: 78.5±11 s, set NE-C: 92±15 s, E-C: 113±15 s). Thus, environmental enrichment had a positive effect on emotional reactivity when quails were exposed to repeated negative stimulations, but it had little effect on control quails.
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Submitted on : Thursday, May 19, 2016 - 11:24:54 AM
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  • HAL Id : hal-01318090, version 1


Agathe Laurence, Cécilia Houdelier, Christophe Petton, Ludovic Calandreau, Cécile Arnould, et al.. Beneficial effects of environmental enrichment on emotional reactivity of Japanese quail submitted to repeated negative stimulations. 45th Congress of the International Society of Applied Ethology, International Society for Applied Ethology (ISAE), Jul 2011, Indianapolis, United States. ⟨hal-01318090⟩



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