The effects of predator stimuli on physiological and behavioral responses in goats

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  • AOYAMA Masato
    Department of Animal Science, Faculty of Agriculture, Utsunomiya University
  • NATSUME Yuta
    Department of Animal Science, Faculty of Agriculture, Utsunomiya University
  • FUKUI Emiko
    Department of Animal Science, Faculty of Agriculture, Utsunomiya University
  • KOGANEZAWA Masaaki
    Utsunomiya University Funyu Experimental Forests, Faculty of Agriculture, Utsunomiya University
  • SUGITA Shoei
    Department of Animal Science, Faculty of Agriculture, Utsunomiya University

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  • 捕食動物に由来する刺激がヤギの生理学的・行動学的反応に及ぼす影響

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Abstract

The aim of this study was evaluate the aversive effects of some predator-related stimuli on goats by analyzing their physiological and behavioral responses. In experiment 1, the respective effects of chain saw (ChS), dog barking (DoB), wolf howling (WoH), Lion Growl (LiG), Tiger Growl (TiG), Vision of Wolves (WoV) on a TV monitor, and Skin of Dog (DoS) were examined in four female Shiba goats. The significant increase in plasma cortisol (Cor) level (P<0.01, repeated measures ANOVA and Tukey's test) and decrease in self grooming frequency (P<0.1, Friedman's test and Nemenyi's test) were found in DoB and DoS session. In experiment 2, the aversion of ChS, DoB, WoH, LiG, TiG and DoS to the same four goats were evaluated by measuring the latency to starting to eat the fodder placed on just front of each stimulus. All goats did never approach to the fodder in DoB and DoS sessions throughout the 30min test period whereas they started to eat fodder immediately in other sessions. The correlations between the results of experiment 2 and experiment 1 of each goat were high (latency vs plasma Cor level: r=0.78-0.94, latency vs self grooming frequency: r=-0.73--0.98). In experiment 3, the physiological and behavioral effects of ChS, DoB, figure of the dog (DoF), DoS and skin of the dog covered with the cardboard box (CDS) were examined with the same way as experiment 1. The plasma Cor levels or self grooming frequency in DoB and DoS were significantly higher or lower than others. Four goats of five showed the higher plasma Cor level or the lower self grooming frequency in CDS session. These results indicate that the aversion to DoB and DoS that observed in experiment 2 seemed to be induced by the psychological stress to these stimuli. In addition, visual stimuli might not effective at least when these were presented alone, whereas auditory and olfactory stimuli might be effective in goats.

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