花幼鱼饲料中脂肪水平适宜量的研究

Optimal dietary lipid level for juvenile Hemibarbus maculatus Bleeker

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60d养殖对比试验研究了饲料中花[鱼骨]（Hemibarbusn meulatus）幼鱼脂肪水平适宜量。结果显示：花[鱼骨]幼鱼饲料中不同脂肪水平对花[鱼骨]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％的饲料花鲭的生长最快，相对增重率为（1066．35±13．15）％；以投喂脂肪水平为5．77％的饲料花鲭对蛋白质利用最高，蛋白质效率为（1．84±0．10）；以投喂脂肪水平为5．77％的饲料花[鱼骨]对饲料的利用最好，饲料系数仅1．39。研究结果表明：花[鱼骨]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[鱼骨]幼鱼饲料脂肪的最适含量定为6％-7％。

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. macu/atus 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.