不同锌源对鲫鱼生长、血液指标及骨锌含量的影响

Effect of dietary zinc source on growth performance,blood indices and vertebrae zinc content of Crucian carp

试验旨在研究饲料中添加不同锌源对鲫鱼生长性能、骨锌含量和5'-核苷酸酶和碱性磷酸酶活性的影响,为在水产饲料中合理选择锌源提供科学的参考。试验选用初均重为(3.33±0.22)g/尾的芙蓉鲫180尾,随机分为3个处理,每处理3个重复,每重复20尾。以常规蛋白源设计基础饲料,对照组饲喂基础饲料(93.03 mg/kg Zn),试验组在基础饲料中分别添加50 mg/kg Zn水平的不同锌源,即分别为一水硫酸锌(硫酸锌组)、碱式氯化锌(碱式氯化锌组)。以天然水库水为水源,在室内桶中饲喂72 d。结果显示:①不同处理组鲫鱼增重率、平均日增重及特定生长率以碱式氯化锌组最高,显著或极显著高于对照组(P<0.05,P<0.01)。而硫酸锌组增重率、特定生长率和铒料系数与对照组相比无显著差异。与硫酸锌组对比,碱式氯化锌组鲫鱼增重率、平均日增重及特定生长率有升高趋势,分别高于硫酸锌组5.38%、3.19%和4.2%(P>0.05)。②碱式氯化锌组鲫鱼血清碱性磷酸酶活力高于硫酸锌组173.02%(P<0.05),5'-核苷酸酶活力高于硫酸锌组59.41%(P<0.05)。③碱式氯化锌组鲫鱼脊椎骨微量元素锌的含量比硫酸锌组高8.64%,比对照组提高了15.66%。以上结果说明,碱式氯化锌是一种比硫酸锌生物效价更高的营养性锌源,更有利于提高鲫鱼的生产性能。

A 72 day growth trial was conducted to study the e.ffeet of dietary zinc source on growth i^erformanee, 5＂-nucleotidase and alkaline phosphalase ativily of hlood and vertebrae zinc aeeumulalion of crucian carp. Fish with initial body weight of （3.33＋0.22） g were randomly assigned into 3 treatntents wilil 3 replicates in each treatment and 20 fish pet＂ replicate. A basal diet was formulated with conventional protein source. Fish in the control group were fed the llasi al diet （93.03 mg/kg Zn）. 3＂lie experimental groups were supplenlented with 50 mg/kg Zn levels of zinc＇ sulfate monohydrate（zine sulfate group）and tetrahasic zinc chloride（tetralmsie zinc chlo- ride group） in basal diet. The resulls showed as Iollows： （1） The rate of weighl gain, daily gain and specific growth rate of Cru（＇ian carp in tetrabasic zinc chloride grout was highest, and was significantly higher than those of the control group （P〈0.05, P〈O.01）. And contrasted with zinc sulfate group, the rate of weight gain, daily gain and specific growth rate in telrabasie zinc chlo- ride group increased by 5.38c,4, 3.19% and 4.2%（P〉0.05）. No signifieant differences were ob- served in lhe rate of weight gain and specific growth rate among zinc st, lfate group and tetraba- sit＇ zinc chloride group（P〉O.05）. Compared with the control group, all the experimental groups shnwed higher bed conversion rate（P〉O.05）. Contrasted with zinc sulfate group, the 5 nucleotidase and alkaline blood in tetrabasi phosphalase activity of zinc chloride group in- creased by 173.02%（P〈0.05） and 59.41%（P〈 0.05）. The vertebrae zinc contenl in Tetra basic zinc chloride group was 8.64% higher than that of zinc sulfate group, 15.66% higher than thai of control group. These results showed thai, the maximum production performance of Cru- clan carp can he improved by zinc supplementation in the basal diet at proper level. But the effect of supplementation of different zinc sources was inconsistent. The biological potency of lel- rabasic zinc chloride was higher than zinc： sulfate, and tetrabasic zinc chloride was more con- duetive to improving the prodution performance of Crucian carp.