饲料n-3/n-6脂肪酸比值对军曹鱼生长及鱼体组织脂肪酸组成的影响

以精制鲽鱼油和豆油分别作为n-3及n-6系列脂肪酸源,配制5种不同n-3/n-6脂肪酸比值的饲料,进行连续8周饲喂军曹鱼幼鱼试验。结果表明,当饲料中的n-3/n-6脂肪酸比值为2.57时,军曹鱼的增重率和饲料效率最高;饲料中不同n-3/n-6脂肪酸比值对军曹鱼血清5项生理指标的影响不显著,但随着n-3/n-6脂肪酸比值的降低,血清中的谷丙转氨酶、谷草转氨酶、胆固醇含量表现出下降趋势;饲料中n-3、n-6多不饱和脂肪酸含量,与军曹鱼肌肉和肝脏的n-3、n-6多不饱和脂肪酸含量呈正相关。统计分析表明,军曹鱼饲料中适宜的n-3、n-6脂肪酸比例为2.98∶1。

Effects of feedstuff n-3/n-6 fatty acid ratio on growth, fatty acid composition in tissues of juvenile cobia(Rachycentron canadum)

The effects of different feedstuff n-3/n-6 ratios on growth and tissue fatty acids composition of juvenile cobia were studied with refined fish oil and soy oil as n-3 and n-6 series of fatty acids source.The results showed that the cobia had the highest weight gain rate and feed efficiency when n-3/n-6 fatty acid ratio was 2.57,and five serum biochemical indices of five trial groups had no significant difference,but ALT,AST and TC inclined to decrease with the n-3/n-6 fatty acid ratio decreasing.n-3 and n-6 PUFA in the muscle were positive correlated with that in the feedstuff.The optimum feedstuff n-3/n-6 fatty acid ratio for cobia was 2.98.