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Fig. 4. Fuel selection in woodchucks and rabbits before and during a prolonged fast. The % contributions of carbohydrates, lipids and proteins to total oxygen consumption are given for fed animals (A), for animals fasted for 1 day (B) and for animals fasted for 2-7 days (C). Values are means ± S.E.M. for summer woodchucks (N=4), spring woodchucks (N=4) and rabbits (N=9). Values of the same fuel type marked with the same symbol are significantly different from each other.