Fig. 2. Mean rate of oxygen consumption over a 24 h period of adult woodchucks and rabbits during prolonged fasting. Values are means ± S.E.M. (A) Absolute rates in µmol O₂ kg^-1 min^-1 and (B) values expressed as % of initial metabolic rate measured on day 0 in fed animals. Summer woodchucks (N=4), spring woodchucks (N=4) and rabbits (N=9).