Chemical composition of caecal contents in the fowl in relation to dietary fibre level and time of day.

摘要: 1. Immature hens were preconditioned to a standard diet containing either 0, 100, 200 or 400 g/kg of added dried grass, powdered cellulose, grass with an enzyme supplement, and killed at 10.30, 12.30 15.30 hr (after measurement intestinal sugar absorption reported elsewhere). 2. Contents caeca removed from these birds immediately after death weighed analysed for pH, uric acid, free sugars volatile fatty acids, the results related dietary fibre level time day (of death). 3. Wet weights acid concentrations caecal contents both increased increasing in diet; neither measure varied time, thus supporting proposal that filling is continuous. Values pH all close neutrality. 4. Mean molar glucose, galactose, mannose, xylose, arabinose, fucose rhamnose proportions 36:2:3:1:4:1:1, respectively. Xylose declined grass; as did galactose mannose cellulose; arabinose levels changed time. The relative abundance glucose should be taken into account when estimating contributions fermentation products energy balance. 5. acetate, propionate, butyrate, iso-butyrate, valerate iso-valerate 72:22:16:1:2:2. Acetate cellulose treatments caused increases acetate respectively; iso-butyrate