饲料中添加L-肉碱对大菱鲆生长及肝脏脂肪酸的影响

在以鱼粉和大豆浓缩蛋白为蛋白源的基础饲料中分别添加0、200、400、600、800、1 000和2 000 mg/kg的L-肉碱配置7种等氮等能的试验饲料.经8周的摄食生长试验,结果表明:600 mg/kg添加组大菱鲆表现出最好的特定生长率,800mg/kg添加组大菱鲆表现出最好的饲料效率.各实验组间特定生长率及饲料效率均未表现出显著差异(P＞0.05).添加不同梯度L-肉碱对大菱鲆的肥满度、脏体比及肝体比未造成显著影响(P＞ 0.05).同时,各实验组大菱鲆体组成及肝脏脂肪酸含量无显著差异(P＞ 0.05).综合考虑L-肉碱对大菱鲆生长性能及经济效益,建议在以鱼粉为主要蛋白源的大菱鲆饲料不需添加L-肉碱.

Effect of dietary L- Carnitine supplements on growth and liver fatty acid composition of turbot, Scophthatmus maximus L.

The growth response, feed conversion, carcass composition and liver fatty acids were measured in turbot,Scophthatmus maximus L. （initial weight of 11.92 ± 0.02 g） which had been fed diets supplemented with L-earnitine at 0,200,400,600,800, 1 000 and 2 000 mg/kg feed for 8 weeks. The resuhs showed that dietary L- earnitine had no significant influence on growth and feed efficiency,ahhough turbot fed with the diet added with 600 mg/kg L-earnitine got the best special growth rate anti fish fed with tile diet added with 800 mg/kg L- carnitine got the best feed efficiency. There were no significant differences in condition factor, viseerosomatic in- dex and hepatosomatie index. On the other hand,carcass composition and liver fatty acids were not significantly affected by dietary L-carnitine concentration too. In summary,considering the effects of L-earnitine on the growth of turbot and the economic benefits,the addition of L-carnitine in the turbot feed is not recommended.