【摘要】 为研究饲料中添加不同含量稀土、胆汁酸及其复配物对大口黑鲈生长性能、脂肪代谢及肠肝结构功能的影响，选择初始质量为（12.34±0.11）g的大口黑鲈450尾，随机分成6组，每组3个重复，每个重复25尾。对照组（D0）饲喂基础饲料，在其基础上分别添加5种组分不同的复配物，配制成5种等氮等脂的试验饲料，分别命名为D1(75 mg/kg胆汁酸+75 mg/kg稀土壳糖胺螯合盐+75 mg/kg单甘酯)、D2(100 mg/kg胆汁酸+75 mg/kg稀土壳糖胺螯合盐)、D3(100 mg/kg胆汁酸+50 mg/kg稀土壳糖胺螯合盐+75 mg/kg单甘酯)、D4(75 mg/kg胆汁酸+60 mg/kg肉碱)和D5(150 mg/kg胆汁酸)。结果表明：与对照组相比，各添加组的生长性能及饲料利用无显著差异（P> 0.05）;D1和D2组肠道中的胰蛋白酶、脂肪酶活性显著大于其他各组（P <0.05）,D1组的淀粉酶活性显著大于其他各组（P <0.05），但各组Na~+-K~+-ATPase活性较对照组降低27.68%～55.35%(P <0.05)。与对照组相比，各试验组的血浆谷草转氨酶（AST）活性下降10.86%～35.48%(P <0.05)，谷丙转氨酶（ALT）活性变化不显著（P> 0.05）;D3组的胆固醇（TC）含量显著高于对照组（P <0.05）,D3组甘油三酯（TG）显著高于其他各组（P <0.05）。综合生长性能、消化和免疫相关酶活性变化的各指标，100 mg/kg胆汁酸复配75 mg/kg稀土（铈和镧）壳糖胺螯合盐的D2组为最优添加组。更多还原

【Abstract】 This experiment was conducted to investigate the effects of different contents of rare earth,bile acids and their complexes on growth performance,fat metabolism and enterohepatic structure and function of largemouth bass. A total of 450 largemouth bass with an initial mass of(12.34 ±0.11)g were randomly divided into 6 groups with 3 replicates per group and 25 largemouth bass per replicate. Control group(D0)was fed a basal diet,and supplemented with 5 different compounds to prepare 5 isonitrogenous and isolipid experimental diets. They were named D1,D2,D3,D4 and D5. The results were as follows: compared with the control group,there were no significant differences in growth performance and feed utilization of each supplemental group(P > 0.05);The intestinal trypsin and lipase activities in D1 and D2 groups were significantly higher than those in other groups(P < 0.05),the amylase activity in D1 group was significantly higher than that in other groups(P < 0.05),but Na~+-K~+-ATPase activity was decreased by 27.68% ～ 55.35%(P < 0.05). Compared with the control group,plasma AST activity in experimental groups was decreased by10.86% ～ 35.48%(P < 0.05),ALT activity did not change significantly(P > 0.05);TC content in D3 group was significantly higher than that in control group(P < 0.05),TG in D3 group were significantly higher than those in other groups(P < 0.05). Considering the changes of growth performance,digestion and immune-related enzyme activities,D2 group with 100 mg/kg bile acid combined with 75 mg/kg rare earth(cerium and lanthanum)chitosamine chelate was the optimal supplemental group.更多还原