Changes in food intake and gut size in Japanese quail in response to manipulation of dietary fibre content

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Abstract
Adult Japanese quail (Coturnix coturnix japonica) which were fed, since hatching, on either a conventional diet (low-fiber) or on the same diet diluted with 200 g oak sawdust/kg (high-fiber) took 8-10 days to adjust their food intake when their diets were interchanged. Those fed on high-fiber diet weighed less than those fed on low-fiber diet, and body weight changed rapidly when the diets were interchanged. All the birds digested about the same weight of nutrients in a day, irrespective of diet, and this suggests that body weight differences were due mainly to differences in energy utilization, birds fed on high-fiber diet having to expend more energy on feeding than those fed on low-fiber diet. Gut size was greater in birds fed on high-fiber diet, presumably to accommodate the greater bulk of food eaten, and when the diets were interchanged the gut dimensions of both groups changed at similar rates, reaching the appropriate sizes for the respective diets in 3-4 wk.