Ontogenetic Changes of Ultrasonic Vocalizations Emitted from Infant Rats

Autor: Masahiro Katou, Toru R. Saito, Makoto Yokosuka, Takako Nishiya, Haruo Hashimoto, Naoki Moritani, Pudcharaporn Kromkhun, Minoru Tanaka
Rok vydání: 2007
Předmět:
Zdroj: Experimental Animals. 56:315-318
ISSN: 1881-7122
1341-1357
Popis: 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.
Databáze: OpenAIRE