摘要
以鱼粉、豆粕和酪蛋白为主要蛋白源,小麦粉为糖源,配制出基础饲料。分别在基础饲料中添加7.5%的牛油(BT)、鱼油(MFO)、豆油(SO)、玉米油(CO)或花生油(PO)作为不同脂肪源,制出5种等氮等能的试验饲料,并以此饲料投喂军曹鱼幼鱼(8.3±0.5g)8周。试验结果显示,饲料中的脂肪源显著影响军曹鱼的生长(SGR)和肌肉、肝脏的脂肪酸组成(P<0.05)。投喂饲料中含有鱼油的军曹鱼表现出最好的特定生长率,其次分别为豆油组、花生油组、玉米油组和牛油组。鱼油对军曹鱼有较高的营养价值,其中的EPA和DHA等n-3系列高不饱和脂肪酸(n-3HUFA)是军曹鱼的必需脂肪酸。
A study was conducted to evaluate the effects of dietary lipids on growth and fatty acid composition of juvenile cobia（Rachycentron canadum）. Five semi-purified diets containing 43.5% crude protein with 20.0 MJ available energy/kg were supplemented with 7.5% of either beef tallow（BT）, soybean（SO）, peanut （PO）, corn（CO） or menhaden fish oils （MFO）. The diets were fed to triplicate groups of 20 fish（8.3±0.5g） for 56 days. Results showed that fish fed the diets containing fish oil had the highest SGR, closely followed by soybean oil, peanut oil, corn oil and beef tallow diets（P〈0.05）. Fatty acid composition in muscle and livers of cobia reflected those of the dietary lipids, especially for the diets containing unsaturated fatty acid. These data indicate that MFO showed a higher nutritional value for juvenile cobia and that n-3 highly unsaturated fatty acids such as eicosapentaenoic（20：5n-3） and docosahexaenoic（22：6n-3） acids in MFO are essential for maximum growth of cobia.
