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

通过一系列的饲养试验，研究了氨基酸螯合微量元素对虹鳟鱼种的有效性。试验一，在半纯饲料中添加硫酸锌蛋氨酸，饲喂虹鳟鱼12周。添加硫酸锌蛋氨酸的虹鳟鱼的生长性能与硫酸锌相似。在虹鳟鱼饲料中添加硫酸锌蛋氨酸对鱼体矿物质含量无影响，测定了氨基酸螯合锌在虹鳟鱼实用型饲料中的利用率。在含有锌利用抑制剂磷酸三钙和菲汀的鱼粉、脱脂豆粕和玉米蛋白粉日粮中分别添加硫酸锌蛋氨酸和氨基酸螯合锌。将试验饲料喂给虹鳟鱼。日粮锌源对生长和饲料效率无显著影响。氨基酸螯合锌组的碱性磷酸酶活性和锌的吸收量显著高于其它组，因此，在同一实用型饲料中测定了氨基酸螯合锰的有效性。氨基酸螯合锰组的生长和体锰含量显著高于硫酸锰组，表明氨基酸螯合微量元素可能上级无机元素。例如硫酸盐。

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.