Studies on the availability of amino acids chelated trace elements to rainbow trout fingerling

为了确定氨基酸螯合微量元素对虹鳟鱼鱼种的可利用性，进行了一系列饲养试验。第一次试验在半纯化饲料中添加硫酸锌蛋氨酸，投喂虹鳟12周。在添加硫酸锌蛋氨酸的饲料中，虹鳟鱼的生长性能与添加硫酸锌的饲料相似。添加硫酸锌蛋氨酸对鱼体内矿物质含量没有影响。测定了实用型饲料中氨基酸螯合锌对虹鳟的可利用性。在鱼粉、脱脂豆粕和玉米蛋白粉中添加两种氨基酸螯合锌，即硫酸锌蛋氨酸和氨基酸螯合锌，这两种氨基酸螯合锌均含有磷酸三钙和植肽等锌利用抑制剂。将实验饲料投喂虹鳟。饲粮锌源对生长和饲料效率影响不显著。氨基酸螯合锌组的碱性磷酸酶活性和锌吸收量显著高于其他组。因此，在相同实用类型的饲粮中，确定了氨基酸螯合锰的可利用性。氨基酸螯合锰组鱼的生长和体锰含量显著高于硫酸锰组。这些结果表明，氨基酸螯合微量元素可能优于无机元素。如硫酸盐。

A series of feeding experiments was conducted to determine the availability of amino acids chelated trace elements to rainbow trout fingerling. At first experiment, zinc sulfate methionine was supplemented to semi-purified diet, and fed to rainbow trout for 12 weeks. The growth performance of the rainbow trout fed the diet supplemented zinc sulfate methionine was similar to that on zinc sulfate. The mineral content in fish was not affected by the supplementation with zinc sulfate methionine.The availability of amino acids chelated zinc in practical type diet to rainbow trout was determined. Two type of amino acids chelated zinc, zinc sulfate methionine and amino-acids chelated zinc, were supplemented the diet including fish meal, defatted soybean meal and corn gluten meal, which contained inhibitors of zinc utilization, e.g. tricalcium phosphate and phytin. The experimental diets were fed to rainbow trout. Growth and feed efficiency were not significantly influenced by the dietary zinc sources. Alkaline phosphatase activity and absorption of zinc was significantly higher in the fish fed the diet with amino acids chelated zinc than the others.Consequently, availability of amino acids chelated manganese was determined with the same practical type diet. The growth and body manganse content were significantly higher in the fish fed the diet with amino acids chelated manganese than that on manganese sulfate.These results demonstrated that the amino acids chelated trace elements might be superior to the inorganic elements. e.g. sulphates.