作　　者： ; ; ; ; ;

机构地区： 广东省农业科学院

出　　处： 《动物营养学报》 2009年第5期680-687,共8页

摘　　要： 本研究旨在观察实用饲料中添加不同锌源和锌水平对罗非鱼生长性能、抗氧化指标和体组成的影响。试验选用初重为(2.98±0.02)g的奥尼罗非鱼1 080尾,随机分为9组,每组4个重复,每个重复30尾。分别饲喂1种实用对照饲料和8种添加不同水平硫酸锌(记作Zn-10、Zn-20、Zn-30和Zn-60)和蛋氨酸锌(记作MZn-10、MZn-20、MZn-30和MZn-60)的试验饲料,2种锌源饲料中的锌添加量分别为10、20、30和60 mg/kg,试验期为8周。结果显示:Zn-60和MZn-60组的增重率显著高于对照组(P<0.05),饲料系数显著低于对照组(P<0.05)。罗非鱼肝脏超氧化物歧化酶和总抗氧化能力水平分别在MZn-20组达到最高,显著高于对照组、Zn-10和Zn-60组(P<0.05);过氧化氢酶活性在MZn-20组显著高于Zn-30、Zn-60和MZn-60组(P<0.05)。与对照组和硫酸锌组相比,蛋氨酸锌组罗非鱼肌肉粗蛋白质含量显著升高(P<0.05),肌肉粗脂肪含量显著降低(P<0.05);与对照组相比,Zn-20和Zn-30组肌肉粗脂肪含量显著降低(P<0.05),Zn-10组肌肉灰分含量显著升高(P<0.05)。随饲料中锌添加量的增加,罗非鱼肥满度呈现出先下降后增加的趋势,在Zn-20和MZn-30组达到最低,显著低于对照组和其他各蛋氨酸锌组(P<0.05)。添加锌的各试验组罗非鱼肝体比呈升高趋势,Zn-30和MZn-60组显著高于对照组(P<0.05),罗非鱼脂体比在MZn-60组显著高于对照组(P<0.05)。由此得出,实用饲料中添加60 mg/kg锌能够提高罗非鱼幼鱼的生长性能,硫酸锌和蛋氨酸锌的促生长作用效果相似;实用饲料中添加10～20 mg/kg锌能够增强罗非鱼抗氧化能力,蛋氨酸锌抗氧化作用明显优于硫酸锌。 A feeding experiment was conducted to study the effects of zinc sources and levels on growth performance, antioxidant indices and body composition in juvenile tilapia （Oreochromis niloticus × O. aureus）. One thousand and eighty fish with （2.98 ± 0.02） g initial body weights were divided into 9 groups with 4 replicates of 30 fish in each replicate. Nine groups fed control diet and eight experiment diets （zinc sulfate or zinc methionine, zinc additions were 10, 20, 30 and 60 mg/kg, respectively） during 8 weeks feeding trial. The nine groups were named CO, Zn-10, Zn-10, Zn-20, Zn-30, MZn-10, MZn-20, MZn-30 and MZn-60, respectively. The results showed that, compared with control group, the weight gain rate was increased significantly （P 〈 0.05） and feed conversion ratio was decreased significantly （P 〈 0.05） in Zn-60 and MZn-60 group. The activities of superoxide dismutase and total antioxidant capacity in liver in MZn-20 group was the highest, and significantly higher than those in control group, Zn-10 and Zn-60 groups （P〈0.05）. The activity of catalase in liver in MZn-20 group was significantly higher than that in Zn-30, Zn-60 and MZn-60 groups （P〈0.05）. Compared with control group and adding zinc sulfate groups, contents of crude protein in muscle were significantly increased, while content of crude lipid in muscle were significantly decreased by the supplemental zinc methionine （P〈0.05）. Compared with control group, content of crude lipid in muscle was decreased in Zn-20 and Zn-30 groups （P〈0.05）, while content of ash in muscle was increased in Zn-10 group （P〉0.05）. With the increasing of dietary zinc levels, condition factor was decreased and then increased, and the lowest level were found in Zn-20 and MZn-30 group which were significantly lower than that in control group and other experimental groups （P〈0.05）. Compared with the control group, adding zinc to diets improved hepaticso- matic index and showed a significant increase in Zn-30 and MZn-60 gr

关 键 词： 罗非鱼 硫酸锌 蛋氨酸锌 生长性能 抗氧化指标 体成分

领　　域： [农业科学] [农业科学] [农业科学] [农业科学]