Figure 1

Body mass (A), food intake (B), litter size (C), litter mass (D) and mean pup mass (E) during lactation in Swiss mice at 21 and 30 °C. Females were allowed to raise 12 pups only from the day of parturition (day 0) and were exposed to either 21 (n = 21) or 30 °C (n = 21) from day 1 of lactation. Data are means ± s.e.m. *Significant difference between the two groups (P < 0.05), **P < 0.01.