VC对草鱼成鱼生长、肌肉品质及血清非特异性免疫的影响

Effects of supplemental vitamin C on growth, meat quality and serum non-specific immunity of adult grass carp,Ctenopharyngodon idellus

以VC磷酸酯为VC源,配制VC添加量分别为0mg/kg(对照组)、100mg/kg、200mg/kg的3组实用饲料,喂养体重(614.9±60.5)g的草鱼(Ctenopharyngodon idellus)60d,探讨VC对草鱼成鱼生长性能、肌肉品质和血清非特异性免疫的影响。结果表明,饲料中添加VC100mg/kg或200mg/kg,均可显著提高草鱼增重率(P<0.05),降低饲料系数(P<0.05);草鱼肌肉胶原蛋白含量、肌纤维直径和肝脏VC含量随VC添加量的增加而增加(P<0.05);饲料中VC添加量≥100mg/kg后,血清超氧化物岐化酶(SOD)活性显著提高(P<0.05),VC添加量达200mg/kg后,血清碱性磷酸酶(AKP)活性显著提高(P<0.05);各组间血清溶菌酶(LSZ)活性差异不显著(P>0.05)。上述研究表明,实用饲料中添加VC能促进草鱼成鱼生长,改善肌肉品质,增强机体非特异性免疫力。以生长性能为指标,草鱼成鱼饲料中适宜的VC添加量为100mg/kg。

A study was conducted to investigate the effects of supplemental VC in practical diet on growth,meat quality and non-specific immunity of adult grass carp（Ctenopharyngodon idellus） .Three practical diets added with L-ascorbyl-2-phosphate as VC 0 （control group） ,100 or 200 mg /kg respectively,were fed to triplicate groups of adult grass carp with body weight of （614.9 ± 60.5） g for 60 days.Results showed that the growth rate of grass carp was significantly increased,whereas feed conversion ratio was decreased by supplemental VC 100 or 200 mg /kg in diet （P〈0.05） .Collagen content of muscle,muscle fiber diameter and liver VC concentration increased with the increase of VC supplement （P〈0.05） .The activity of serum SOD（superoxide dismutase） was significantly higher than that of control group when supplemental VC was 100 or 200mg /kg diet,and serum AKP （alkaline phosphatase ） activity significantly increased when supplemental VC was 200mg /kg diet （P〈0.05） .There was no effect of supplemental VC in diets on the activity of LSZ（lysozyme） （P〉0.05） .It is suggested that supplemental VC in diets could improve growth performance,meat quality and serum non-specific immunity indices of grass carp.For adult grass carp,the VC supplement in diet was estimated to be 100 mg · kg^-1 based on growth performance.