A 28-day feeding trial was employed to evaluate whether the used in broiler's diet had any deleterious effects on growth,serum parameters of broiler chicken. 192 21-day old broilers were divided into four groups. Fed diet containing nothing,radix astragalus(RA),fermented radix astragalus extraction(FRAE) and astragalus polysaccharide(AP) separately. Feed efficiency and daily gain in the whole experiment were determined,some serum parameters were measured, the post-mortem organ coefficients were calculated and organ analysis were performed at the end of experiment. The results showed that :①Supplementation with RA significantly decreases average daily gain and average daily feed index(P＜0.05), supplementation with FRAE significantly decreases feed/weight gain(P＜0.05) ;②Supplementation with FRAE significantly decreases the activities of serum LDH(P＜0. 05)compared with the RA group. Supplementation with RA significantly decreases the activities of serum r-GT(P＜0.05) compared with the control group; ③No histopathological damages were detected. From the research,it was concluded that there were obvious promotional effects of the FRAE on the broiler chicken's growth and health.%将192只体重均一的21日龄肉仔鸡随机分成4组,分别饲喂正常日粮、含黄芪生药(RA)日粮、含发酵型黄芪提取物(FRAE)日粮和含黄芪多糖(AP)日粮,试验期28 d.测定肉仔鸡全程饲料利用率、日增重;50日龄心脏采血制备血清,测定其中乳酸脱氢酶、丙氨酸氨基转移酶、碱性磷酸酶、天冬氨酸氨基转移酶、γ-谷氨酸转肽酶的酶活性,尿酸的含量.扑杀后测定器官指数,并做组织切片镜检.结果表明:①经过28 d试验,RA组的平均日增重和日采食量明显下降(P＜0.05),FRAE组饲料转化率明显下降(P＜0.05);②和RA组相比,FRAE组的乳酸脱氢酶活性明显降低(P＜0.05),和对照组相比,RA组的γ-谷氨酸转肽酶活性明显降低(P＜0.05);③显微镜下观察各组织无病理变化.结果显示,在试验期内发酵型黄芪提取物对肉仔鸡的生产性能和健康状况有明显促进作用.
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