飼料に添加したメチオニンのニジマスにおける利用〔英文〕

概要

論文の詳細を見る
To elucidate the utilization of dietary methionine in rainbow trout, a feeding experiment was conducted. Five experimental diets were prepared: Diet 1, a basal diet containing 50% casein as a sole protein source; Diets 2 to 4, L-methionine was supplemented at levels of 0.5, 1.0, and 1.5% to the basal diet, respectively; Diet 5, containing 50% egg white albumin as a protein surce. The fish fed on the methionine-supplemented diet accumulated large amounts of methionine in both the liver and muscle. Unlike methionine contents, hepatic taurine contents were slightly affected by the dietary treatments. Net protein utilization (NPU) was improved by supplementation of methionine up to 1.0 %. However, NPU of fish fed on the diet supplemented with 1.5% methi-onine was lower than that of the 1.0%, methionine diet. These results suggest that rainbow trout has limited ability to convert methionine to cysteine via a transsulfuration pathway, and that dietary methionine was not utilized effectively when fish were fed with a large amount of methionine.
日本水産學會の論文