本试验旨在研究饲料中添加微囊丁酸钠对高密度养殖条件下团头鲂生长性能、非特异性免疫力及肝功能的影响。选取健康、规格相近[初始体重为（200.78±0.46）g]的团头鲂1 500尾，随机分为5组，每组6个重复，每个重复50只。对照组饲喂基础饲料，试验组分别饲喂在基础饲料基础上添加200、400、600和1 000 mg/kg微囊丁酸钠的试验饲料，试验期60 d。结果显示：1）与对照组相比，饲料中添加600、1 000 mg/kg的微囊丁酸钠显著提高了增重率（P<0.05）；饲料中添加1 000 mg/kg的微囊丁酸钠显著降低了饲料系数（P<0.05）。2）与对照组相比，饲料中添加600、1 000 mg/kg的微囊丁酸钠显著提高了血清、黏液、肝胰脏中总超氧化歧化酶（T-SOD）活性和血清中溶酶菌（LSZ）活性（P<0.05）；饲料中添加400 mg/kg的微囊丁酸钠显著提高了肝脏中T-SOD活性和血清中LSZ活性（P<0.05）；饲料中添加1 000 mg/kg的微囊丁酸钠显著提高了黏液中LSZ活性（P<0.05）。3）与对照组相比，饲料中添加600、1 000 mg/kg的微囊丁酸钠显著提高了肝胰脏中谷丙转氨酶（GPT）、谷草转氨酶（GOT）活性（P<0.05）。由此可见，饲料中添加适量微囊丁酸钠有利于提高高密度养殖条件下团头鲂对饲料的利用率及其非特异性免疫力，并改善肝功能。
This experiment was conducted to evaluate the effects of microencapsulated sodium butyrate on growth performance, nonspecific immunity and hepatic function of blunt snout bream under high density culture condition. A total of healthy 1 500 blunt snout bream with the initial body weight of (200.78±0.46) g were randomly divided into 5 groups with 6 replicates in each group and 50 fish in each replicate. The fish in control group was fed with a basal diet for 60 days, while the fish in experimental groups were fed the basal diet supplemented with 200, 400, 600 and 1 000 mg/kg microencapsulated sodium butyrate for 60 days, respectively. The results showed as follows:1) compared with the control group, diet supplemented with 600 and 1 000 mg/kg microencapsulated sodium butyrate significantly increased the weight gain rate (P<0.05); diet supplemented with 1 000 mg/kg microencapsulated sodium butyrate significantly decreased the feed conversion rate (P<0.05). 2) Compared with the control group, the total superoxide dismutase (T-SOD) activity in serum, mucus and hepatopancreas and the lysozyme (LSZ) activity in serum were significantly increased by adding 600 and 1 000 mg/kg microencapsulated sodium butyrate into the diet (P<0.05); the T-SOD activity in liver and the LSZ activity in serum were significantly increased by adding 400 mg/kg microencapsulated sodium butyrate into the diet (P<0.05); the LSZ activity in mucus was significantly increased by adding 1 000 mg/kg microencapsulated sodium butyrate into the diet (P<0.05). 3) Compared with the control group, the activities of glutamic-pyruvic transaminase (GPT) ferase and glutamic oxalacetic transaminase (GOT) in hepatopancreas were significantly increased by adding 600 and 1 000 mg/kg microencapsulated sodium butyrate into the diet (P<0.05). It can be seen that adding sodium butyrate into the diet can improve the feed utilization rate, nonspecific immunity and hepatic function of blunt snout bream under high density culture condition.
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