ニジマス飼料におけるたん白質および脂質の至適添加量

概要

論文の詳細を見る
A feeding trial was conducted in order to determine the optimum ratio of protein to lipid in diets of rainbow trout by feeding them various diets containing different amounts of lipids (5-20%) in different protein levels (16-48%). The weight gain and feed conversion improved in each dietary protein level as the dietary lipid levels were increased, reaching a maximum in the 35% protein diets with 15-20% lipid. The higher the lipid content or the lower the protein content in the diets, the higher the rate of protein which was retained, suggesting that protein was efficiently utilized by increased levels of dietary lipids. The lower the lipid content or the higher the protein content in the diets, the higher the retention rate of lipid which was observed, suggesting that some part of the dietary protein was converted to body fat. The lower the protein content, the higher the values which were obtained for PER and NPU. These values of casein determined at different protein and lipid levels indicate that the addition of more than 10% dietary lipids is necessary in order to increase the efficiency of protein utilization. It has thus been shown that the optimum ratio of protein to lipid in diets of rainbow trout is 35% to 15-20%. and that at these levels of lipids dietary protein can be reduced from 48% to 35% with no loss in weight gain.
日本水産學會の論文