肌醇对胭脂鱼生长、体成分和部分血清生化指标的影响

以酪蛋白、明胶和鱼粉为蛋白源配制6组实验饲料,分别在饲料中添加0、75、150、300、600和1 200mg/kg的肌醇,每组设3个重复,连续投喂初始体质量(10.01±0.24)g的胭脂鱼(Myxocyprinus asiaticus)幼鱼8周,考察饲料中添加不同水平的肌醇对胭脂鱼幼鱼生长性能、全鱼以及肌肉营养成分和部分血清生化指标的影响,以确定胭脂鱼幼鱼饲料中肌醇的适宜添加量。结果显示:随着饲料中肌醇含量增加,胭脂鱼幼鱼增重率、成活率和特定生长率呈先上升后稳定的趋势,均在300 mg/kg组时达到稳定;饲料肌醇对全鱼体成分无显著性影响,肌肉脂肪含量在300 mg/kg组时显著低于未添加组;饲料中肌醇对血清总胆固醇、低密度脂蛋白胆固醇和血清甘油三酯均有显著性影响;饲料中肌醇(150 mg/kg)不足时,血清中谷草转氨酶和谷丙转氨酶的活性显著高于其它实验组。以特定生长率为评价指标,经折线回归分析,饲料中补充310.3 mg/kg的肌醇时,胭脂鱼幼鱼获得最大生长。

Effects of dietary myo-inositol on growth performance,body composition and some serum biochemical indexes of Chinese sucker,Myxocyprinus asiaticus

A growth trial was conducted to investigate the effects of dietary myo-inositol on growth performance,body composition and some serum biochemical indexes of Chinese sucker,Myxocyprinus asiaticus.Semi-purified diets supplemented with six levels of myo-inositol (0,75,150,300,600,and 1 200 mg/kg diet,respectively) were fed to triplicate groups of Chinese sucker (initial mean weight: 10.01±0.24 g) for 8 weeks.The results showed that,weight gain rate,survival rate and special growth rate increased at first and then remained stable with the increasing dietary myo-inositol content,and all of them reached the maximum values at 300 mg/kg diet.The crude lipid in muscle at 300 mg/kg diet was lower than the control group,while there were no significant differences in whole body composition.Serum total cholesterol,low density lipoprotein cholesterol content,the triiglyceride,aspartate aminotransferase and alanine aminotransferase were all significantly influenced by dietary myo-inositol supplementation.Broken-line regression analysis based on SGR showed that juvenile Chinese sucker could obtain optimal growth when dietary myo-inositol supplementation was 310.3mg/kg diet.