Figure 5.

(a) Food intake and (b) wheel-running activity of rats during pregnancy and lactation. Days are expressed relative to the day of parturition (day =0) also indicated by the dotted line. Data are split between those raising large (n>6; open squares) and those raising small (n<6; filled squares) litters. Note how food intake in the larger litters increases dramatically a few days before weaning probably due to intake by the offspring (plots from data presented in tables 2 and 3 of Slonaker 1924).