Ontogenetic Changes of Ultrasonic Vocalizations Emitted from Infant Rats

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  • HASHIMOTO Haruo
    Department of Comparative and Behavioral Medicine, Nippon Veterinary and Life Science University
  • MORITANI Naoki
    Department of Comparative and Behavioral Medicine, Nippon Veterinary and Life Science University
  • KATOU Masahiro
    Department of Comparative and Behavioral Medicine, Nippon Veterinary and Life Science University
  • NISHIYA Takako
    Department of Animal Physiology, Nippon Veterinary and Life Science University
  • KROMKHUN Pudcharaporn
    Department of Physiology, Kasetsart University
  • YOKOSUKA Makoto
    Department of Comparative and Behavioral Medicine, Nippon Veterinary and Life Science University
  • TANAKA Minoru
    Department of Animal Physiology, Nippon Veterinary and Life Science University
  • SAITO Toru R.
    Department of Comparative and Behavioral Medicine, Nippon Veterinary and Life Science University

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Ontogenetic changes of USVs were investigated to establish an index of stress in infant rats. The USVs were obtained by exposing infant rats to cold stress and were analyzed by real-time spectrography. USV waveforms consisted of four types, R-I, II, III and IV. These USVs were closely monitored at the age of 3-7 days in both sexes. From day 14, the frequency and incidence of USVs gradually decreased and had disappeared completely at the age of 21 days. Therefore, USVs should be useful in estimating the stress of infant rats between the ages of 3-7 days.<br>

収録刊行物

  • Experimental Animals

    Experimental Animals 56 (4), 315-318, 2007

    公益社団法人 日本実験動物学会

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