Ultrasonic vocalization in female rats: A comparison among three outbred stocks from pups to adults

Physiology & Behavior
Rainer K W Schwarting

Abstract

Long Evans (LE), Sprague-Dawley (SD) and Wistar (WU) are outbred rat stocks, which differ in terms of brain, physiology, pharmacological reactivity and behavior. Extending our previous work with males from these stocks, we here report the analysis of ultrasonic vocalizations (USV) in females. Identical to our previous studies, we tested them as pups for 40-kHz calls during short-term isolation, as juveniles for appetitive 50-kHz calls during a cage test or when being tickled, and finally as adults for 22-kHz calls in a fear conditioning paradigm. Stock differences were obtained in all four tests, albeit with different patterns: As pups, WU rats emitted more calls and spent more time calling than SD or LE rats. Furthermore, LE rats emitted calls with shorter durations, whereas SD emitted calls with lower peak frequencies and less frequency modulation. Furthermore, stock differences in call sub-types were detected. In the cage test, 50-kHz calls were most frequent in WU and rather few in LE rats. Call durations were longer in WU rats. When being tickled, SD females emitted calls with shorter durations and lower peak frequencies. Also, frequency modulation and call amplitude was higher in LE. Finally, the fear-conditioning test le...Continue Reading

Citations

Jul 4, 2021·Behavioural Processes·Hiroki KogoYukari Takeuchi

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Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Médicas E Biológicas
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