摘要：Effect of exercise on apparent energy digestibility of timothy and alfalfa hay were estimated in two-year-old horses. Intensity of the exercise was equal to 80% heart rate max (180 beats/min) for 5 min between warm-up and cool-down. Timothy and alfalfa hay intakes in the exercise and rest periods did not differ significantly. The apparent energy digestibility and digestibility energy (DE) of timothy hay in exercised horses were significantly lower than in rested horses but there were no significant differences between exercised and rested horses in the apparent energy digestibility or DE of alfalfa hay. These results suggested that exercise in this study decreased energy digestibility of timothy hay and it seemed that the effect of exercise on the energy digestibility of hay was altered by the composition of hay.
