Fig. 2.

Maternal behavior of FVB/J and C57BL/6J foster mothers. Average percent time spent by FVB/J and C57BL/6J dams on maternal behavior variables (A) and on total nursing (B) during postnatal days P1–P8. Data are the mean ± SEM from two independent experiments; n = 7–9. *P < 0.01; ^#P < 0.05 by unpaired t test for independent samples. Average body weight of pups (6–8 litters) fostered to C57BL/6J and to FVB/J mothers is noted. Data are representative of two independent experiments. Two-way ANOVA revealed a significant effect of foster mother strain: [F_(1,12) = 21.6; P < 0.001] and of foster mother strain–days interaction: [F_(1,96) = 20.3; P < 0.001]. *P < 0.01; ^#P < 0.05, by Newman–Keuls.