Fig. 4. Litter mass (A) and pup body mass (B) as a function of litter size for mice
at 30°C raising 6-15 pups (filled circles; N=61). Data for mice
raising 1-5 pups are also shown (open circles; N=6). All parameters
are those on day 14 of lactation. Pup body mass is the litter mass divided by
litter size. The relationships are described by
y=39.58+1.89x (A) and y=10.48-0.44x
(B).