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ULTRASONIC RESPONSE OF CBA NEWBORN MICE TO BEDDING ODOUR

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A drop in ambient temperature which increases thermogenesis is the fundamental factor stimulating ultrasonic vocalization in newborn rodents. Neonatal mice modify ultrasonic calling in response to olfactory cues. When removed from the nest and cooled, CBA-strain mouse pups produced ultrasonic calls on the 3rd, 5th and 7th days of life. The presence of conspecific bedding affected their ultrasonic vocalization. The number and duration of calls were higher in 3-day-old CBA pups exposed to bedding of C57BL lactating females than in newborns tested in the presence of bedding from CBA lactating females. This indicates that CBA pups discriminate between the odours of the two genotypes. The influence of postnatal experiences on the ability to differentiate odours was investigated. Three-day-old CBA mice nursed by their own mothers vocalized at higher frequencies than did newborns fostered by C57BL lactating females. It is suggested that ultrasonic vocalization in CBA pups is affected by genetic factors and postnatal environmental conditions.

10.1163/156853999501324
/content/journals/10.1163/156853999501324
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/content/journals/10.1163/156853999501324
1999-03-01
2016-12-10

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