中国水产科学Issue(3)：560-566,7.DOI:10.3724/SP.J.1118.2014.00560
肌醇对哲罗鲑生长性能、体成分及消化酶活性的影响
Effects of myo-inositol on growth performance, body composition, and digestive enzyme activity in Hucho taimen
摘要
Abstract
Hucho taimen is a fast growing, easily domesticated, carnivorous fish that is valued for its taste and nutri-tional value. This species has been domesticated and bred successfully in more than a dozen provinces in China, in-cluding Heilongjiang, Liaoning, Shandong, and Xinjiang. Despite prior research, the nutrient requirements of H. taimen are poorly understood. We evaluated the effects of dietary myo-inositol (MI) levels on body composition, growth per-formance, and digestive enzyme activity in H. taimen. We formulated seven semipurified basal diets using fish meal, gelatin, and casein as the protein source. The MI content of the diets was 99.8, 199.8, 299.8, 499.8, 799.8, 899.8, or 5 099.8 mg MI/kg diet. Each diet was fed to triplicate groups of 30 fish (mean initial weight:2.83±0.44 g) for 56 d. The weight gain rate was highest in fish fed a diet with 499.8 mg MI/kg and was significantly higher (P<0.05) than that in fish fed diets with≤299.8 mg MI/kg. Weight gain rate was lowest in the group fed a diet with 99.8 mg MI/kg. Feed conversion ratio was lowest in H. taimen fed a diet with 499.8 mg MI/kg, and was significantly (P<0.05) lower than in H. taimen fed a diet with 299.8 mg MI/kg or 5 099.8 mg MI/kg. The feed conversion ratio was highest in fish fed a diet with 5 099.8 mg MI/kg. The specific growth rate was significantly higher (P<0.05) in fish fed 499.8-899.8 mg MI/kg than fish fed diets with≤200 or 5 099.8 mg MI/kg. Supplementation of dietary myo-inositol did not affect moisture, crude lipid, crude protein, or amylase activity in the liver and lipase activity in the pyloric caeca (P>0.05). Fish fed a diet with 499.8 mg MI/kg had the highest (P<0.05) protease activity in the liver, followed those fed by 699.8 mg MI/kg. Lipase activity increased initially and then decreased as the level of dietary MI increased. Lipase activity in the liver of H. taimen fed 299.8 mg MI/kg was significantly (P<0.05) higher than in those fed 99.8 mg MI/kg. Protease activity was significantly higher (P<0.05) in the intestine of fish fed diets with 199.8-499.8 mg MI/kg than those fed the other diets. Lipase activity was significantly higher in the intestine of fish fed 299.8-899.8 mg MI/kg than fish fed 99.8 mg MI/kg. Amylase was significantly higher (P<0.05) in the intestine of fish fed 499.8 mg MI/kg than in the remaining groups. In conclusion, supplementation of diets with moderate concentrations of myo-inositol resulted in better growth perform-ance and digestive enzyme activity in H. taimen. Feeding diets with lower MI concentrations was associated with lower weight gain, specific growth rate, crude lipid levels, and digestive enzyme activity. Feeding diets with excessive MI was associated with reduced growth performance, digestive enzyme activity and feed conversion efficiency. Based on weight gain rate using broken-line regression, the weight gain rate in H. taimen was maximized by feeding 536.6 mg MI/kg diet. Our results provide insight into the dietary MI requirements for H. taimen.关键词
哲罗鲑/肌醇/生长性能/体成分/消化酶活性Key words
Hucho taimen/myo-inositol/growth performance/body composition/digestive enzyme activity分类
农业科技引用本文复制引用
张美彦,王常安,徐奇友..肌醇对哲罗鲑生长性能、体成分及消化酶活性的影响[J].中国水产科学,2014,(3):560-566,7.基金项目
农业部公益性行业专项(201003055) （201003055）
中央级公益性科研院所基本科研业务费项目(201103) （201103）
