饲料中土豆蛋白替代鱼粉对虹鳟摄食率、消化率和生长的影响

通过生长试验探讨了饲料中土豆蛋白浓缩物替代鱼粉后对虹鳟摄食率，消化率，生长和饲料利用的影响，对照饲料全部鱼粉为蛋白源，其它饲料分别含土豆蛋白２．２％，５．６％，８．９％和１１．１％，另一饲料含５．６％，土豆蛋白和１．７％蛋氨酸，在１２℃下饲养４周，试验结果表明，随着饲料中土豆蛋白使用比例的增加，虹鳟的摄食率下降，饲料的干物质，蛋白和灰分的表现消化率上升，脂肪的表现消化率无显著影响，当饲料中含５．６

EFFECT OF REPALCEMENT OF FISH MEAL BY POTATO PROTEIN CONCENTRATE IN THE DIET FOR RAINBOW TROUT ON FEEDING RATE, DIGESTIBILITY AND GROWTH

Six isonitrogenous and isoenergetic diets were composed to investigate the effects of incorporation of potato protein concentrate (PPC) and supplementation of methionine in the diet for rainbow trout (Oncorhynchus mykiss) on feeding rate,digestion, growth, feed utilization and body composition. The control diet contained all Danish L T-fish meal as protein sources. The other experimental diets contained 2.2, 5.6, 8.9 and 11.1% PPC respectively. Diet 6 contained 5.6% PPC and 1.7% methionine. A 4-week trial was conducted at about 12t. The results showed that feeding rate decreased with increased incorporation levels of PPC. Apparent digestibility of dry matter, crude protein and ash increased with increased proportion of dietary PPC, while there was no significant effect on the apparent digestibility of crude fat. The incorporation of 5.6% PPC decreased growth rate and 8.9% PPC decreased both growth and feed efficiency. Supplementation of 1.7% methionine decreased both feeding rate and growth.