黄霉素和甘露寡糖对奥尼罗非鱼的生长性能及血清非特异性免疫的影响

Effects of flavomycin and mannan oligosaccharides on growth performance,nutrients digestibility and non-specific immunity in tilapia(Oreochromis niloticus×O.aureus)

本研究分两个试验考察饲料中添加黄霉素和甘露寡糖对奥尼罗非鱼(Oreochromis niloticus×O.aureus)生长性能、营养物质消化率及血清非特异性免疫的影响。试验Ⅰ以平均初重(1.00±0.00)g奥尼罗非鱼为试验对象,在基础饲料(对照组)中分别添加8 mg/kg黄霉素和5 g/kg甘露寡糖。结果表明,饲养8周后,添加8 mg/kg黄霉素和5 g/kg甘露寡糖,奥尼罗非鱼稚鱼增重率分别提高6.1%(P<0.10)和14.3%(P<0.05),饲料系数分别降低8.8%(P<0.05)和12.9%(P<0.05)。试验Ⅱ以平均初重(20.11±0.05)g奥尼罗非鱼为试验对象,试验设计与试验日粮同试验Ⅰ,饲养30 d后,添加黄霉素8 mg/kg和甘露寡糖5 g/kg,鱼体增重率分别提高10.2%(P<0.10)和19.2%(P<0.05),饲料系数分别降低10.2%(P<0.05)和13.4%(P<0.05);干物质消化率分别提高11.2%和12.9%(P<0.05),蛋白质消化率分别提高2.9%和3.4%(P<0.05);添加8 mg/kg黄霉素和5 g/kg甘露寡糖均显著提高血清碱性磷酸酶活性和溶菌酶活性(P<0.05)。研究表明,饲料中添加8 mg/kg黄霉素和5 g/kg甘露寡糖均可提高奥尼罗非鱼的生长性能、营养物质消化率和血清非特异性免疫。

Two experiments were conducted to investigate the ef[ects of adding tlavomycin, mannan-oligosaccharides （MOS） in diets on growth performance,nutrients digestibility and serum non-specific immune index of tilapia （Oreochromis niloticusxO.aureus）.In experiment Ⅰ , basal diets （control）,basal diets supplemented flavomycin 8 mg/kg,basal diets supplemented MOS 5 g/kg were fed to tilapia with initial body weight of （1.00±0.00）g for 8 weeks.The results showed that the growth rate was increased by 6.1%（P 〈 0.10）, 14.3 %（P 〈 0.05） and FCR was decreased by 8.8 %（P 〈 0.05）, 12.9 %（P 〈 0.05）,when 8 mg/kg flavomycin and 5 g/kg MOS added in basal diets.In experiment Ⅱ ,the same three diets were fed to tilapia with initial body weight of （20.11±0.05）g for 30 days.The growth rate of flavomycin （8 mg/kg）, MOS （5 g/kg）groups were increased by 10.2 %（P 〈 0.10）,19.2 %（P 〈 0.05）and FCR was decreased by 10.2 %（P 〈 0.05）, 13.4 %（P 〈 0.05）compared with control group.Dry matter digestibility was increased by 11.2 %, 12.9 % and crude protein digestibility was increased by 2.9 %, 3.4 % by adding flavomycin （8 mg/kg）, MOS （5 g/kg） compared with control gmup（P 〈 0.05）.Activities of serum lysozyme activity,alkaline phosphatase （AKP） were significantly increased by supple- mented flavomycin（8 mg/kg）,MOS（5 g/kg）groups（P 〈 0.05）.It showed that 8 mg/kg flavomycin and 5 g/kg MOS supple- mented in diets could improve growth performance,nutrients digestibility and serum non-specific immune function of tilapia （ Oreochromis niloticusxO.aureus ）.