Fig. 1.

Energy requirements (kJ/d) for body weight maintenance. Changes in weight were compared with average team energy intake. (A) First half of the race, from Whitehorse to Dawson. For the first half of the race the average number of dogs included in the data set: team 1 n 12 dogs; team 2 n 13 dogs and team 3 n 12 dogs (R² 0·5030; P < 0·0001). (B) Second half of the race, from Dawson to Fairbanks. For the second half of the race the average number of dogs included in the data set: team 1 n 11, team 2 n 12, team 3 n 10 (R² 0·3030; P = 0·0036).