EFFECTS OF PARTIALLY HYDROLYZED GUAR GUM ON FEEDING-BEHAVIOR AND CROPEMPTYING RATE IN CHICKS

1. The effects of partially hydrolysed guar gum (PHGG) or intact guar gum (GG) on feeding behaviour and crop emptying rate in growing chicks were investigated. 2. Several combinations of dietary PHGG and GG at 50 g per kg diets were prepared for a feed intake experiment. Birds (1 7-d-old) were given diets for 3 h after 16 h fasting, and food consump tion was measured at 1 h intervals. The food intake rapidly decreased as the dietary GG content increased even at 1 h after feeding. 3. The rate of food passage from the crop was also investigated with birds (2 0-d-old) after 16 h fasting. Birds were tube-fed diets having several ratios of dietary PHGG and GG. After 1 h of feeding, the diet remainin g in the crop was measured after drying. The crop emptying rate decrea sed linearly as dietary PHGG concentration decreased. 4. The present s tudy suggests that partial hydrolysis of dietary GG improve both feedi ng behaviour and food passage from the crop in growing chicks.