酸化剂对草鱼生长和非特异性免疫能力的影响

为考察不同类型酸化剂对草鱼生长及生理机能的影响,在基础饲料(对照组)中分别添加0.21％磷酸、柠檬酸、乳酸和复合酸,饲养初始体重为(10.33±0.03)g草鱼(Ctenopharyngodon idellus)8周.结果表明:(1)与对照组相比,饲料中添加0.21％柠檬酸、乳酸和复合酸均显著提高草鱼的增重率、特定生长...

Effects of acidifiers on the growth performance and non-specific immunity of Ctenopharyngodon idellus

A 8-week feeding trial was conducted to investigate effects of different dietary acid supplements on growth performance,digestive enzyme activities,antioxidation and non-specific immunity of Ctenopharyngodon idellus(average body weight was about(10.33±0.03)g).5 test diets were applied for triplicate tanks and 30 fish was stocked randomly in each tank.No acid supplement was added in basal diet which was applied as control,0.21% of phosphoric acid,citric acid,lactic acid and composite acidifier were added in basal diet,respectively.(1) The results showed that the weight gain,specific growth rate were significantly higher and the feed conversion rate was significantly lower in fish fed diet with citric acid,lactic acid and composite acidifier than those of fish fed basal diet(P<0.05),while no significant differences were observed in fish fed diet with phosphoric acid(P>0.05).(2) No significant differences were observed in the whole body moisture,protein,lipid,ash and the contents of P,K,Na mineral elements(P>0.05).(3) The activities of digestive enzyme of intestine and hepatopancreas in fish fed diets with composite acidifier were significantly higher than that of fish fed basal diet(P<0.05).Significantly higher activities of protease and amylase of intestine and hepatopancreas were observed in fish fed diet with citric acid than that of fish fed basal diet(P<0.05).(4) The serum activities of SOD and GSH-PX and LYS in fish fed diets with different acidifiers were significantly higher than that of fish fed basal diet(P<0.05),while the activity of MDA was significantly lower in fish fed diets with composite acidifier(P<0.05).The activity of serum AKP in fish fed diets with lactic acid and composite acidifier was significantly improved(P<0.05).The results indicated that different acidifiers in fish feed diets could improve the growth performance,digestive enzyme activities,antioxidation and non-specific immunity.Accordingly,the feed efficiency of organic acid was better than mineral acid,and the feed efficiency in fish fed diets with composite acidifier was the best.