饲料镁和鲈鱼幼鱼的生长及鱼体镁含量相关性研究

Correlation between growth of magnesium and Lateolabrax japonicus larvae and magnesium content in fish body

为研究饲料中不同镁含量对鲈鱼(Lateolabrax japonicus)的影响,试验在基础饲料中分别添加0、500、1250、3750、5250、8750 mg/kg MgSO4,配制镁含量分别为167、284、491、959、1327、1759 mg/kg的6种试验饲料,饲养初始体重为(12.31±0.02)g的鲈鱼56 d。结果显示:日粮中适当添加镁显著影响鲈鱼的增重率、特定生长率和饲料效率(P <0.05),其中D4组(镁含量959 mg/kg)鲈鱼的增长率和特定生长率均显著大于其他各组(P <0.05)。饲料镁含量显著影响鲈鱼全鱼水分(P <0.05)。随着饲料镁含量增加,肝脏中天冬氨酸转氨酶(GOT)和丙氨酸转氨酶(GPT)呈下降趋势,GOT与GPT比值和肝脏谷氨酸脱氢酶(GDH)也出现显著变化(P <0.05)。通过回归分析增重率得出,本试验中鲈鱼生长的最适饲料镁含量为846 mg/kg。

This study was conducted to investigate the effect of dietary magnesium(mg)supplement on growth,feed efficiency,body composition and liver function.Six experimental diets were formulated to contain different levels of Mg by supplementing the basal diet with 167,284,491,959,1327,1759 mg/kg Mg in the form of Mg sulphate(MgSO4).Triplicate groups of juvenile seabass with an initial body weight of(12.31±0.02)g were fed to apparent satiation twice daily for 56 d.The results showed that:the highest Weight gain rate(WGR),specific growth rate(SGR)and feed efficiency(FE)were observed for fish fed the D4(Mg 959mg/kg)(P<0.05).The crude protein in body were significantly influenced(P<0.05).With the increase of dietary magnesium,liver aspartate aminotransferase(GOT)and alanine aminotransferase(GPT)showed a downward trend.The GOT/GPT ratio and the liver glutamate dehydrogenase(GDH)activity also occurred.Significant changes(P<0.05).Through the regressive analysis weight gain rate,the best feed magnesium content in this experiment is 846mg/kg.