Fig. 4. Milk energy output (MEO) of shaved (filled circles; N=20) and unshaved control (open circles; N=20) mice plotted against maternal body mass (A), litter size (B) and litter growth (C). Maternal body mass refers to day 15 of lactation. Litter growth is defined as the difference between litter mass on day 18 and day 6 of lactation. Only the correlation between MEO and litter growth is significant (for statistical details, see Results). The fitted line represents reduced major axis regression for the pooled data (N=40), described by y=58.9+2.4x.