军曹鱼幼鱼对饲料中锌需要量的研究  

Study on the Requirement of Dietary Zinc for Juvenile Cobia

作　　者：乔永刚[1] 谭北平[1] 麦康森[1] 艾庆辉[1] 

机构地区：[1]中国海洋大学海水养殖教育部重点实验室,山东青岛266003

出　　处：《中国海洋大学学报（自然科学版）》2007年第S1期105-110,共6页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(30271040);教育部新世纪优秀人才支持计划(2005)资助

摘　　要：利用酪蛋白和明胶为蛋白源的精制饲料,以有机态的蛋氨酸锌(ZnMet)做为锌源,来研究军曹鱼(Rachycentron canadum)幼鱼对锌的最适需要量。分别向基础饲料中添加锌0,20,40,80,160,320 mg/kg,制成6种含有不同锌水平的精制饲料(13.2,36.6,52.5,92.3,171.2,328.2 mg/kg),饲养鱼初始体重为(7.15±0.85)g,实验持续8周。结果表明:饲料中添加不同水平的锌对军曹鱼的存活率并无显著影响(P>0.05);军曹鱼的平均增重率显著受到饲料中不同锌水平的影响(P<0.05),用折线模型进行回归分析,饲料中锌的最适添加量为47.1 mg/ks;饲料中不同锌水平对鱼体水分、粗蛋白质含量并无显著影响,但基础饲料组有最低的脂肪含量和最高的灰分含量,并与其它添加组差异显著(P<0.05);血清碱性磷酸酶的活性,显著受到饲料中不同锌水平的影响(P<0.05),用折线模型进行回归分析,饲料中锌的最适添加量为54.2 mg/k8。综合以上实验结果,以蛋氨酸锌为锌源时,军曹鱼幼鱼对饲料中锌的最适需要量为47～54 mg/kg。The present experiment was conducted to determine the optimum dietary zinc requirement of juve- nile cobia(Rachycentron canadum)with zinc methionine(ZnMet)as zinc sources,by using a purified diet based on casein-gelatin as the protein sources.The basal diet was supplemented with 0,20,40,80,160 and 320 mg zinc kg^(-1)respectively and juvenile cobia(initial weight 7.15±0.85 g)were fed six purified diet containing graded levels of zinc(13.2,36.6,52.5,92.3,171.2 and 328.2 mg/kg),respectively.The feeding trial last- ed 8 weeks.The results showed that the survival rate was not significantly(P>0.05)affected by the different dietary zinc levels.The average weight gain rate(WGR)was significantly(P<0.05)affected by the dietary zinc levels,the broken-line regression equation showed that the optimum dietary zinc requirement of juvenile cobia was 47.1 mg/kg.The whole body moisture and crude protein contents of the cobia were not affected (P>0.05)by the various levels of dietary zinc.However,fish fed the basal diet had the lowest lipid concen- tration and highest ash content,and significant differences(P<0.05)were found between the basal diet group and other groups.Serum alkaline phosphatase activities(SAKP)were significantly(P<0.05)affected by dif- ferent zinc levels in the diet,the broken-line regression equation showed that the optimum dietary zinc require- ment of the juvenile cobia was 54.2 mg/kg.Therefore,using zinc methionine(ZnMet)as zinc sources,the op- timum zinc requirement for juvenile cobia was 47～54 mg/kg.

关 键 词：蛋氨酸锌 锌需要量 军曹鱼 

分 类 号：S965.1[农业科学—水产养殖]