Choline Metabolism and Nutritional Requirement of Lake Trout (Salvelinus namaycush)1

Abstract

Duplicate lots of 2-g lake trout (Salvelinus namaycush) were fed a purified diet alone and with equimolar supplements of aminoethanol, methylaminoethanol, dimethylaminoethanol, choline or betaine. Supplements of choline, methyl- and dimethylaminoethanol significantly increased growth rate and reduced liver fat content, whereas aminoethanol and betaine did not. These results suggest that trout biosyn-thesize choline from methyl- and dimethylaminoethanol but not from aminoethanol or betaine. In another experiment triplicate lots of 5-g trout were fed diets containing graded levels (0, 500, 1,000, 2,000 and 4,000 mg/kg) of choline. Growth results showed that the requirement for choline is no greater than 1,000 mg/kg of diet. Copyright © 1976. American Society of Animal Science . Copyright 1976 by American Society of Animal Science.