Effect of non-starch-polysaccharides on the intestinal physiology of broilers.
2004
Yu, B. | Chuang, H. C. C. | Chu, S. H.
The purpose of this study was to determine the effects of different levels and sources of non-starch-polysaccharides (NSPs) on nutrient digestibility and intestinal tissue structure in broiler chickens. Forty birds were divided into 5 treatments groups at 19 and 40 days old, respectively, for a 10 days digestion feeding trial. Corn, casein and fish meal were used to prepare the control diet. The NSPs extracted from barley and wheat bran were incorporated at 50 or 100 g kg -1 in the basal diet as the treatment diet. The results showed the body weight and feed conversion of 22-28 day old broilers decreased significantly with the barley and wheat bran NSPs inclusion (P0.05), especially in the 10% wheat bran NSP inclusion diet. Higher digesta viscosity in the intestine and lower dry matter, protein and fat digestibility were shown in the 10% barley NSP inclusion group compared with the other treatment groups. On 43-49 day old broilers, the 10% barley NSP inclusion effect was significant on gigesta viscosity and protein digestibility than in the other groups (P0.05). Both NSP incorporated in the diet significantly increased the relative weight of the large intestine and the length of the small intestine in 22-28 day old broilers. There was an increase in the villus height and muscle layer in the ileum in the treatment groups but a reduction in crypt depth in the duodenum. Flate-like ileal villi morphology was observed by SEM in the NSPs inclusion group compared to the finger-like villi of the control. The antinutrive activities of NSP on poultry productivity are derived mainly from the increase in digesta viscosity and reduction in digestive fuction activity.
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