VC对草鱼成鱼生长、肌肉品质及血清非特异性免疫的影响

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。

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

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.Resultsshowed 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.