饲料脂肪水平对锦鲤幼鱼生长和血液生化指标的影响

本实验以初始体重为(5.85±0.19)g红白锦鲤(Cyprinus carpio L)幼鱼为实验对象,研究在螺旋藻添加量为12%时,饲料脂肪水平对锦鲤生长、饲料表观消化率、肠道消化酶和血液生化指标的影响。实验设5.36%、7.74%、10.52%、12.85%、15.45%5个脂肪梯度,每组设3个重复,每个重复10尾鱼,表观饱食投喂60 d。结果显示:脂肪水平为5.36%～10.52%,锦鲤增重率(BWG)、特定生长率(SGR)随脂肪水平的升高而升高,均在脂肪水平为10.52%时,达到最大值。实验鱼血清谷丙转氨酶(ALT)随脂肪添加比例呈现先下降再升高的趋势,脂肪水平为12.85%后,血清ALT显著升高(P<0.05),脂肪水平为15.45%时,血清GLU浓度显著升高(P<0.05),而甘油三酯(TG)、总胆固醇(CHOL)随脂肪水平的升高各实验组间无显著性差异(P>0.05)。结果表明,螺旋藻添加量一定时,锦鲤适宜脂肪添加水平为10.52%。

The effects of dietary lipid levels on growth and blood biochemical indices of Cyprinus carpio L

A feeding trial was conducted to investigate the effects of dietary lipid levels on growth and blood biochemical indices of Cyprinus carpio L.Five experimental diets containing different lipid levels(5.36%,7.74%,10.52%,12.85%,15.45%) were formulated and fed to apparent satiation to five groups for 60 days,each diet contained 12% Spirulina.The results showed that:the body weight gain,special growth rate,feed conversion ratio and protein efficiency ratio increased with the increase of the dietary lipid level from 5.36% to 10.52%.The Alanine transaminase activity and Glucose concentration in blood serum increased with the increase of lipid level,the ALT activity was significantly higher(P<0.05)at the lipid level of 12.85% and GLU concentrations were significantly higher(P<0.05) at the lipid level of 15.45% while there was no significantly effects on triglyceride and cholesterol concentration(P>0.05).In conclusion,the lipid level of 10.52% dietary contained equivalent Spirulina was effective in growth.