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Mean (+SE) number of ultrasonic calls (USVs) emitted by 8-day old pups of different experimental groups, when isolated in their own home-cage bedding for 5 min. Sample sizes: 6–8 per group. Experimental groups: H: Handled; N-H: Non-Handled; RCF: Repeated Cross-Fostering; N-RCF: Control. *p < 0.05 in comparison with all other groups (Fisher test).
