不同脂肪(能量)蛋白比饲料对梭鲈幼鱼生长的影响

比较了5种不同脂肪(能量)蛋白比的配合饲料对初始平均体重(7.75±1.17)g梭鲈幼鱼生长性能的影响。结果表明,投喂不同脂肪蛋白水平的饲料,以能量蛋白比为45.94kJ/g试验组的生长速度最快SGR为(2.86±0.17)%/d]、饲料系数最低(FCR为1.57±0.12)、蛋白质沉积率和能量保留率最大,分别为98.44%±2.38%和30.88%±3.83%;以饲料中蛋白质含量、脂肪含量为变量因子,以梭鲈幼鱼的特定生长率、蛋白质沉积率和能量保留率为指标,通过二元二次回归方程得出梭鲈最大生长速度时饲料中蛋白质含量为39.80%,脂肪含量为8.79%,总能为18.53MJ/kg,脂肪蛋白比为0.22,能量蛋白比为46.56kJ/g;梭鲈获得最大的蛋白质沉积率时,饲料蛋白质含量为38.76%,脂肪含量为9.18%,总能为18.65MJ/kg,脂肪蛋白比为0.24,能量蛋白比为48.12kJ/g;梭鲈获得最大的能量保留率时饲料蛋白质含量为38.55%,脂肪含量为9.45%,总能为18.72MJ/kg,脂肪蛋白比为0.25,能量蛋白比为48.56kJ/g;饲料中脂肪水平的增加可以降低鱼类耗能时对蛋白质的需求量,表...

Effects of different dietary lipid(energy) to protein ratios on growth of juvenile zander (Lucioperca lucioperca)

This experiment was conducted to study growth performance of juvenile zander initial average weight(7.75 ± 1.17) g] fed five formulated diets with different lipid(energy) to protein ratios. The results showed :The specific growth ratio SGR (2.86 ± 0. 17) %/d] , feed coefficient ratio(FCR 1.57 ± 0. 12), protein deposit ratio(PDR 98.44% ± 2.38%), energy retention ratio(ERR 30.88% ± 3.83%) performed the best in group 4 after being fed the different diets; Using the second-order polynomial regression analysis, the optimum protein, the optimum lipid, the optimum gross energy (GE), the optimum lipid to protein ratio (L/P) and the optimum energy to protein ratio(E/P) in diets for juvenile zander(Lucioperca lucioperca) were estimated based on SGR, PDR and ERR of the juveniles. When SGR was the highest, the optimum protein, the optimum lipid, GE, L/P and E/P were estimated to be 39.80% ,8.79%, 18.53 MJ/kg ,0.22, 46.56 kJ/g ;When PDR was the highest, the optimum protein, the optimum lipid, GE, L/P and E/P were estimated to be 38.76% ,9. 18% ,18.65 MJ/kg, 0.24, 48. 12 kJ/g; When ERR was the highest, the optimum protein, the optimum lipid, GE, L/P and E/P were estimated to be 38.55% ,9.45%, 18.72 MJ/ kg, 0.25, 48.56 kJ/g;The requirement for protein used for energy is decreased when dietary lipid level increases. It was suggested that dietary lipid had significant protein-sparing effect on this fish. But zander (Lucioperca lucioperca) utilizes the lipid definitely;When E/P was as high as 58.79 kJ/g or as low as 42.54 kJ/g, WGR, PDR and ERR were significantly lower, FCE was significantly higher(P <0.05) than other E/ P levels,indicating that diets with too high E/P level or low E/P level would inhibit the growth and feed utilization of juvenile zander.