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l. The effects of long-term fasting (13 days) and refeeding (15 days) on body mass and eight blood parameters were determined in the buzzard (Buteo zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJ buteo). 2. Body mass decreased linearly during the first IO days of fasting. By day 13, the buzzards had lost 26% of their initial mass.

3. Urea and uric acid were significantly increased by the starvation. Blood glucose and cholesterol increased during fasting. The other blood parameters were not affected by food deprivation. 4. Increase in plasma globulins at the beginning of refeeding may have produced hemodilution. 5. The results suggest that tissue catabolism of proteins was strongly increased in food-deprived buzzards.