饲料中添加蛋氨酸锌对奥尼罗非鱼幼鱼生长和抗氧化功能的影响

Effect of Supplemental Methionine Zinc Adding to Diet on Growth and Antioxidant Activity of Juvenile Hybrid Tilapia (Oreochromis aureus×Oreochromis niloticus)

以奥尼罗非鱼（Oreochromis auresus ×Oreochromis niloticus）幼鱼为试验对象，以蛋氨酸锌为饲料锌源，研究了在饲料中添加6种浓度的锌（0、5、10、20、g0和80mg／kg）对奥尼罗非鱼幼鱼生长和肌肉抗氧化功能的影响。试验周期56d。试验结果显示：饲料转化率、全鱼脂肪含量、肝脏中水分和脂肪含量随锌添加浓度的升高而降低；增重率、特定生长率、脊椎骨中锌离子含量和血液红细胞数量在锌添加浓度为10mg／kg时达到最大值；肌肉中硫代巴比妥酸底物（TBARS）值在锌添加浓度为5mg／kg时达到最小值。饲料中锌添加浓度为5-10mg／kg时，奥尼罗非鱼幼鱼生长迅速，鱼体抗氧化功能增强。

A 56-day growth trial was conducted to investigate the effect of six zinc concentrations（0, 5, 10, 20, 40, 80 mg/kg） on growth and antioxidant ability of muscle of juvenile tilapia （4. 12- 0. 33 g）. Results showed that feed coefficient, body fat deposited, moisture and fat content in liver decreased as dietary zinc concentration increased; weight gain, specific growth rate, zinc concentration in bones and erythrocytes number reached the highest when zinc concentration was 10 mg/kg; TBARS value（Thiobarbituric acid reagent） was the lowest when zinc concentration was 5 mg/kg. So juvenile tilapia had faster growth and stronger antioxidant activity when methionine zinc concentration was 5 - 10 mg/kg.