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(A) Frequency of contact with the litter (Mean + SEM), (B) frequency of erect postures over the litter (kyphosis and hovering over; Mean ± SEM) and (C) frequency of sleeping away from the nest (Mean + SEM) by early-postpartum or later-postpartum dams interacting with younger or older litters. * = significant main effect of postpartum stage, p < 0.05. & = significant main effect of litter age, p < 0.05. + = significant interaction, p < 0.05.
