Understanding pup affective state through ethologically significant ultrasonic vocalization frequency.

Sci Rep · 2017 · PMC5647438 · PMID 29044126

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highly significantno p-value reported

35 demonstrated that there is a highly significant linear relationship ( r 2 = 0.9) between body weight and the frequency of the 40-kHz USV emitted by infant rats between the ages of PN2 and PN20.

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