肌醇对团头鲂幼鱼生长、血清生化及组织成分含量的影响

试验以初均重为（3.40±0.07）g的团头鲂幼鱼为研究对象，分别配置含肌醇水平为0 mg/kg、100 mg/kg、200 mg/kg、400 mg/kg、800 mg/kg、1 600 mg/kg的6组等氮等能饲料，每组3个重复，连续投喂90 d后通过测定其生长指标、部分血清生化指标及肝脏和肌肉中的脂肪含量来评价饲料中的肌醇水平对团头鲂幼鱼的影响。结果表明：（1）与对照组相比，400 mg/kg肌醇添加组的末均重（FAW）、增重率（WGR）和特定增长率（SGR）显著增大（P〈0.05）；而饵料系数（FCR）却显著性降低（P〈0.05）；存活率，肝体比（HSI）、脏体比（VR）及肥满度（CF）差异不显著（P〉0.05）；（2）800 mg/kg试验组的血清葡萄糖、胆固醇和低密度脂蛋白显著升高（P〈0.05）；甘油三酯水平显著降低（P〈0.05）；高密度脂蛋白无显著性差异（P〉0.05）； （3）400、800 mg/kg试验组的肝脏和肌肉脂肪含量显著低于对照组（P〈0.05）；而肌肉粗蛋白含量显著升高（P〈0.05）；肌肉中的水分、粗灰分无显著性差异（P〉0.05）。以鱼体特定增长率和饵料系数为评价指标，经折线模型回归分析得到团头鲂幼鱼饲料中肌醇的适宜添加量分别为294.4 mg/kg和284.9 mg/kg。

Effects of dietary inositol on growth performance, physiological and biochemical indexes of serum and fat content in liver and muscle of juvenile Wuchang bream (Megalobrama amblycephala)

An 90-day growth experiment was conducted to investigate the dietary inositol requirement of juvenile Wuchang bream (Megalobrama amblycephala). The fish were randomly divided into sixgroups: a control group was fed with basal diet, and five treatment groups fed with basal diet supplemented with 101.2, 202.3, 404.8, 809.1, 1616.4 mg/kg inositol, respectively. Each diet was fed to triplicate groups of juvenile M. amblycephala with initial average body weight (3.4±0.07)g. At the end of feeding trial, final average weight (FAW), weight gain rate (WRG) and specific growth rate (SGR) of fish fed diet 404.8mg/kg inositol were significantly higher than these of the control (P<0.05); while feed conversion rate (FCR) was significantly lower in the group supplemented with 404.8mg/kg inositol (P<0.05). The concentrations of glucose(GLU), cholesterol (TC) and low density lipoprotein (LDL-C) were higher in fish fed 809.1mg/kg inositol (P<0.05) and concentration of triglyceride (TG) was significantly lower (P<0.05) than these of the control (P<0.05); In addition, the fat content in liver and muscle of the groups supplemented with 404.8, 809.1 mg/kg inositol were significantly lower than that of control (P<0.05); wherase crude protein in muscle was significantly enhanced than that of control (P<0.05). No significantly difference were observed in survival rate, hepatosomatic index (HSI), viscerosomatic ratio (VR), fullness coefficient(CF), high density lipoprotein (HDL-C) moisture and ash in muscle (P>0.05). On the basis of SGR and FCR, the optimum dietary inositol requirement of juvenile M. amblycephala was estimated to be 294.44mg/kg and 284.85, using broken-line regression analysis.