团头鲂饲料中卵磷脂需求量的研究  

Dietary lecithin requirement of blunt snout bream(Megalobramaamblycephala)

作　　者：徐登辉[1] 叶元土[1] 蔡春芳[1] 吴萍[1] 黄雨薇[1] 陈科全[1] 彭侃[1] 罗其刚 林秀秀[1] 

机构地区：[1]苏州大学基础医学与生物科学学院,江苏苏州215123

出　　处：《饲料工业》2015年第8期12-17,共6页Feed Industry

基　　金：公益性行业(农业)科研专项[201003020]

摘　　要：试验旨在通过半精制饲料中添加不同梯度大豆卵磷脂,研究其对团头鲂生长性能、体脂含量以及血清生化指标的影响,以确定饲料中卵磷脂的最适需求量。选用初重为（70.5±1.4）g的团头鲂480尾,随机分成6组,每组4个重复,每个重复20尾,分别投喂卵磷脂含量为1.48（1组,对照组）、3.12（2组）、5.79（3组）、8.35（4组）、10.03（5组）、13.13 g/kg（6组）的饲料,养殖周期40 d。研究表明：1随着卵磷脂含量的升高,6组的特定生长率显著高于对照组（P〈0.05）;与对照组相比,3组、6组末重分别增加了9.61%（P〈0.05）和10.76%（P〈0.05）;添加大豆卵磷脂组的脂肪沉积率显著高于对照组（P〈0.05）,但对成活率、饲料系数、蛋白质效率、蛋白沉积率、肥满度、肝脏指数均无显著性差异（P〉0.05）。2与对照组相比,试验组体脂含量均显著升高（P〈0.05）,添加水平在5.79 g/kg以上时肌肉粗脂肪含量显著高于对照组（P〈0.05）;但肝脏的粗脂肪含量（除了4组）显著低于对照组（P〈0.05）;添加大豆卵磷脂组的团头鲂腹腔脂肪显著高于对照组（P〈0.05）。3随着大豆卵磷脂添加水平的增加,团头鲂血清中胆固醇、高密度脂蛋白和低密度脂蛋白指标呈上升趋势。以饲料系数以及特定生长率为评价指标,经折线模型回归分析得到,团头鲂获得最佳生长性能时对饲料卵磷脂需求量为0.024~0.025 g/（100 g体重·d）。The present study was conducted to evaluate the effects of dietary lecithin on growth perfor- mance, hody lipid composition and serum biochemical parameters, and thereby to determine dietary lecithin requirement for juvenile blunt snout bream （MegMobrzrnzamblycephala）. Six experimental di- ets were formulated to supply the graded levels of soy lecithin （containing lecithin 1.48, 3.12, 5.79, 8.35, 10.03, 13.13 g/kg of diet, respectively）. A total of 480 healthy blunt snout bream with an average body weight of （70.5＋1.4） g were randomly divided into 6 groups with 4 replicates per g,＇oup and 20 fish per replicate. The specific growth rate （SGR） was significantly higher in 13.13 g/kg group com- pared with the control group （P〈0.05）. Compared with the control group, the final body weight （FBW） in lhe 5.79,13.13 g/kg groups was increased by 9.61%and 10.76%, respectively. The lipid retention ra- tio （LRE） of supplemental lecithin was significantly higher than the control. Different levels of lecithin inclusion did not affect survival, feed conversion ratio （FCR）, protein efficiency ratio （PER）, protein re- tention ratio （PRR）, fatness or hepatosomatic in- dex. The body fat content anti the abdominal fat of diets supplemented group were significantly higher than the control group （P〈O.05） and the lipid in the muscle was significantly higher when added level 5.79 g/kg or more. In contrast, the lipid in the hepatopancreas of the fish fed the graded levels of lecithin was lower than the control diet, except that of the level of 8.35 g/kg. The cho- lesterol, high density lipoprotein cholesterol （HDL-C） and low density lipoprotein cholesterol （I,DL-C） concentrations in tile serum was increasing with the raising of the lecithin content. Based on the bro- ken line model analysis of the SGR and FCR data indicated that the optimum recommended dietary lecilhin requirement for juvenile blunt snout bream was 0.024-0.025 g/（100 g·d）.

关 键 词：团头鲂 卵磷脂 需求量 生长 

分 类 号：S963.73[农业科学—水产养殖]