花幼鱼饲料中脂肪水平适宜量的研究

以等量混合的鱼油、豆油作为添加的脂肪源,设计成脂肪水平为1.62%、3.71%、5.77%、7.96%、9.95%和12.01%的6种饲料进行60 d养殖对比试验研究了饲料中花(Hem ibarbus maculatus)幼鱼脂肪水平适宜量。结果显示:花幼鱼饲料中不同脂肪水平对花的相对增重率、饲料系数和蛋白质效率存在显著差异(P<0.05),其中以投喂脂肪水平为7.96%的饲料花的生长最快,相对增重率为(1066.35±13.15)%;以投喂脂肪水平为5.77%的饲料花对蛋白质利用最高,蛋白质效率为(1.84±0.10);以投喂脂肪水平为5.77%的饲料花对饲料的利用最好,饲料系数仅1.39。研究结果表明:花幼鱼饲料中脂肪含量以5.77%~7.96%为最佳,考虑到饲料成本,把花幼鱼饲料脂肪的最适含量定为6%~7%。

Optimal dietary lipid level for juvenile Hemibarbus maculatus Bleeker

A growth experiment was conducted to determine the optimal dietary lipid level for juvenile Hemibarbus maculatus Bleeker.Six semi-purified diets(crude protein:39%) were formulated to contain 1.62%,3.71%,5.77%,7.96%,9.95% and 12.01% lipid with fish oil and soybean oil(1∶1) as lipid sources,respectively.Each diet was randomly assigned to triplicate groups of fish.Through 60 d growth experiment,significant differences were observed in weight growth rate,feed conversion rate and protein efficiencies among the treatments(P<0.05).Juvenile H.maculatus grew fastest when lipid level 7.96%,and the weight growth rate was(1066.35±13.15)%;protein efficiencies was the highest,which was(1.84±0.10),feed conversion rate was the lowest,which was 1.39,when lipid level was 5.77%.Based on these observations,the dietary lipid level could be devised to range from 5.77% to 7.96%for juvenile H.maculatus.The 6%~7%lipid level could be optimal in the diet in consideration to dietary.