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Effect of dehulled barley diet with β-glucanase supplement on performance of growth and characters of digestive tract of broiler
|關鍵字:||β-glucanase;β-聚葡萄糖;broiler;growth performance;dehulled barly;肉雞;生長性能;脫殼大麥||出版社:||畜產學系||摘要:||
The purpose of this study was conducted to determine the effects of dehulled barley substituting for corn in the traditional ration and supplement β-glucanase on growth performance, digestibility, and characteristics of intestine in broilers. In trial 1, a group of 480 male and female broilers(Arbor Acers)was randomly divided 24 pens. A corn-soybean meal diet was the control diet, with dehulled barley substituting for 40% and 80% in isoenergetic and isonitrogenous diet and with or without β-glucanase supplement(0.1% of diet) in a 3×2 factorial design. In trial 2, a group of 640 male and female broilers(Arbor Acers)was randomly divided 32 pens. A corn-soybean meal diet in trial 1 was also as the control diet, dehulled barley substituting for 50% and 100% of corn. Another treatment was substituting for 80% dehulled barley in isoenergetic and isonitrogenous diet and with or without β-glucanase supplement (0.1% of diet) in a 4×2 factorial design. The result showed that, in growth performance and digesta viscosity aspects, as the amount of dehulled barley substituting for corn increased, the body weight of the broiler during growth period increases significantly higher than the control because of higher feed intake in trial 1(P<0.05), and so do the body weight and the body weight gain during the finishing period (P<0.05). However, there was no significant difference in the feed conversion; this might be the diet in trial 1 has reached the nutritional requirement of broilers, so the enzyme supplement doesn''t show significant effects. In trial 2, because of the interaction between dehulled barley treatment and enzyme supplementation, enzyme supplement only significantly improved the body weight gain of growth and finish period which directly substitute dehulled barley with 50% or 100% of corn (P<0.05). In two trails, the higher of dehulled barley substituting for corn, digesta viscosity of the duodenum increased, the higher relative weight of crop, ileum, caecum, and colon (P<0.05); after enzyme supplement, digesta viscosity of barley directly substituting for corn decreased significantly. Dehulled barley substituting for 80% corn in the isoenergetic and isonitrogenous diet has higher abdominal fat than other groups (P<0.05), because the higher feed intake of higher oil amount. In the nutrient digestibility and intestinal enzyme activity, there was no significantly effect by dehulled barley directly substituting for corn, but decreased the activities of α-amylase in duodenum and lipase in jejunum during the growth period, the activities of protease in the duodenum andα-amylase in the jejunum (P<0.1). No matter in the isonutritional diet, dehulled barley substituting for corn decreased significantly dry matter and fat digestibilities(P<0.05), enzyme supplement has significantly increased fat digestibility of barley substituting for 50% or for 100% corn diet(P<0.05). The soluble fiber in dehulled barley was easily used and fermented by microbes of caecum. In the trail 2, the short-chain fatty acid was the energy source of intestinal cell proliferation, the villus height, crypt depth, villus area and villus perimeter of the duodenum and the crypt depth and muscle layer of the jejunum were increased significantly(P<0.05), enzyme supplementation increased significantly(P<0.05) the villus height and villus area of the jejunum, it would increase absorption of the nutrient. No matter growing period or finishing period, the muscle layer of the dehulled barley treatment increased significantly(P<0.05), the retention time of the soluble fiber was longer, it increased the capacity of the intestinal peristalsis. To summarize, dehulled barley substituting for higher corn in the isoenergetic and isonitrogenous diet, the feed intake of broiler increased to improve growth performance of the broiler, and no effect on enzyme supplement. But dehulled barley directly substituting for corn and enzyme supplementation has lower digesta viscosity, and improved significantly the dry matter and fat digestibility of the broiler, and improved the weight gain of broilers. No matter in the isoenergetic and isonitrogenous diet, if dehulled barley directly substituting for corn, it would effect on relative weight of intestine, mucosa tissue and the fermentation of caecum.
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