摘要： 以尼罗罗非鱼(Tilapia nilotica)为试验对象，初始平均体重为(106.16±16.77)g，小麦基础饲料为对照，小麦基础饲料中分别添加不同水平的木聚糖酶(0.05%，0.10%，0.15%)，75 d后测定其增重率、内脏指数、肝胰脏指数、肠道指数、表观消化率及肌肉营养成分。结果表明，对照组尼罗罗非鱼的增重率为258.24%，0.05%和0.10%组的增重率较对照组分别提高8.29%和17.45%(P<0.01)。对照组肠道指数和肝胰脏指数分别为1.90和2.82，0.05%组的肠道指数显著低于对照组(P<0.05)，0.10%组极显著低于对照组(P<0.01)。0.05%，0.10%和0.15%组的肝胰脏指数分别比对照组降低14.54%，27.30%和12.06%(P<0.01)。对照组饲料干物质和总糖表观消化率分别为67.35%和61.48%。0.05%，0.10%和0.15%组的干物质消化率分别比对照组提高7.69%(P<0.05)，11.00%(P<0.01)和2.87%(P<0.05)。3个试验组的总糖表观消化率均极显著高于对照组(P<0.01)。0.05%和0.10%组肌肉粗蛋白含量分别显著(P<0.05)、极显著高于对照组(P<0.01)。0.05%和0.10%组肌肉粗脂肪含量分别比对照组提高14.43%和33.89%(P<0.01)。0.05%，0.10%和0.15%组试验鱼肌肉中粗灰分含量分别比对照组提高4.11%，7.54%和2.77%(P<0.01)。0.05%，0.10%和0.15%组肌肉总钙含量分别比对照组提高19.70%，25.76%和15.15%(P<0.01)，总磷含量分别比对照组提高4.78%，3.83%和3.83%(P<0.01)。0.05%和0.10%组试验鱼肌肉水分含量极显著低于对照组(P<0.01)。因此，本研究结论：在含50%小麦的基础饲料中适量添加木聚糖酶，可以提高尼罗罗非鱼的生长性能，其适宜添加水平为0.10%。

关键词: 木聚糖酶, 尼罗罗非鱼, 小麦基础饲料, 生长性能

Abstract: The test was designed for 4 treatments: wheat basal diet (control) and added with different levels of the xylanase (0.05%, 0.10% and 0.15%). Each treatment was divided into 5 replicates and each replicate included 40 male Tilapia nilotica. The initial weight of experimental fishes was (106.16±16.77) g. After they were fed in floating cages for 75 days, the growth index, vixcus index, hepatopancreas index, intestine index, apparent digestibility and muscle composition of them were measured, respectively. The results indicated that the xylanase significantly promoted the growth of Tilapia nilotica, The weight gain rate of control was 258.24%. The weight gain rate in 0.05% and 0.10% xylanase groupswas 8.25% and 17.45% higher than that of the control (P<0.01), respectively. The xylanase could eliminate the compensatory hyperplasy of digestive organs of Tilapia nilotica. Intestine index and hepatopancreas index of the control were 1.90 and 2.82, respectively, but were much lower in the xylanase groups. The xylanase could improve the digestion and absorption. Apparent digestibilities of dry matter and total carbohydrate of the control were 67.35% and 61.48% respectively. The digestive rates of dry matter for 0.05%, 0.10% and 0.15% xylanase groups were increased by 7.69%, 11.00% and 2.87% respectively. Apparent digestibility of total carbohydrate in the three groups were significantly higher than that of the control (P<0.01). The contents of crude protein in 0.05% and 0.10% xylanase groups were higher significantly than that of the control. The contents of crude fat of 0.05% and 0.10% xylanase groups were increased by 14.43% and 33.89%, respectively. The contents of crude ash in 0.05%, 0.10% and 0.15% xylanase groups were increased by 4.11%, 7.54% and 2.77%, while the contents of total calcium by 19.70%, 15.76% and 15.15%, and the contents of total phosphorus by 4.78%, 3.83% and 3.83%, respectively. The contents of moisture in 0.05% and 0.10% xylanase groups were lower significantly than that of the control (P<0.01). So we concluded that adding xylanase to wheat basal diet could promote Tilapia nilotica growth performance, the appropriate level is 0.10%.

Key words: Xylanase, Tilapia nilotica, Wheat basal diet, Growth performance

中图分类号: 

• S963