翘嘴红鲌幼鱼的适宜脂肪需求量研究

该文旨在研究6种等氮等能饲料中，脂肪水平对翘嘴红鲌生长、饲料利用及体组成成分的影响。试验选用平均初始体重为19．36g±2．17g的翘嘴红鲌600尾，随机分为6个处理组，每组30尾，每组设3个重复。采用单因素设计，以鱼油为脂肪源，用添加不同水平鱼油（添加量分别为0％、2％，4％，6％、8％、10％）的饲料喂养翘嘴红鲌，试验期60d。结果表明：饲料中脂肪含量为7．14％对，试验鱼的特定生长率最大（1．34％／d）、饵料系数最低，为1．25，与饲料脂肪含量为9．26％组无显著差异，但与其余各试验组的差异显著（P〈0．05）。蛋白效率在饲料中脂肪含量为9．26％时最大，与饲料中脂肪含量为7．14％时无明显差异（P〉0．05），而与其余各试验组的差异显著（P〈0．05）。饲料脂肪含量对翘嘴红鲌体脂肪、蛋白质含量的影响显著（P〈0．05），对翘嘴红鲌体水分和灰分含量无显著影响（P〉0．05）。用折线回归模型分析饲料脂肪添加量与翘嘴红鲌特定生长率、饲料蛋白效率及饵料系数的变化关系，表明试验中翘嘴红鲌饲料中脂肪的适宜添加量为7．14％～9．26％。

The optimal requirement of lipid for Juvenile Erythroculter ilishaeformis

To study the effects of different dietary levels of lipid on growth performance, feed utilization and body composition of juvenile Erythroculter ilishaeforrnis, an experiment was conducted using a total of 600 Erythroculter ilishaeform is to investigate the effects of adding fish oil （0%. 2%, 4%. 6%. 8%. 10% respectively） on growth, feed utilization and body composition.The fish were randomly divided into 6 treatments with 3 replicates each （30 for each treatment）, lasted for 60 days. The results showed that the specific growth ratio （SGR） of Erythroculter ilishaeformis was highest （1.43%/d）,at the same time, Feed conversion ratio （FCR） was the lowest （1.25）. when the lipid content was 7.14%, there was no significance difference with the feed of the fat content （9.26%）（P〉0.05）,but significantly different with other groups （P〈0.05）;the protein efficiency ratio （PER） was highest （2.02%） when the lipid content was 9.26%, there was no significance difference with the feed of the fat content （7.14%）（P〉0.05）,but significantly different with other groups （P〈0.05）; The whole body lipid and protein content were significantly affected by the dietary lipid supplementation levels （P〈0.05）, while there was no significant effect of lipid on body moisture and ash content （P〉0.05）. Based on broken line regression analysis of the specific growth ratio, the protein efficiency and the feed conversion efficiency, the optimal dietary supplementation level of lipid for this diet formulation was 7.14% -9.26%.