酵母细胞壁多糖对肉仔鸡生长性能及免疫力的影响  

Effects of yeast polysaccharide on growth performance and immunity of broilers

作　　者：王辉田[1] 孙超[1] 陈思[1] 吴宏平[1] 王娇娇[1] 夏文明[1] 

机构地区：[1]沈阳农业大学畜牧兽医学院

出　　处：《中国饲料》2013年第13期11-14,共4页China Feed

摘　　要：为研究酵母细胞壁多糖(YP)对肉仔鸡的生长性能和免疫力的影响,试验将200只体重相近的1日龄AA肉仔鸡随机分成5组,每组设5个重复,每个重复8只鸡。A组为对照组,饲喂玉米-豆粕型基础日粮;B、C、D、E组为试验组分别在基础日粮中添加500、1000、1500、2000 mg/kg的YP。试验期42 d。结果表明:(1)日粮中添加YP对肉仔鸡前21 d的平均日增重、平均日采食量和料肉比均无显著影响(P>0.05);但在22～42日龄及整个试验期内,与对照组相比,日粮中添加1000、1500、2000 mg/kg水平的YP均显著提高了日增重,并显著降低了料肉比(P<0.05)。(2)随YP添加量的增加,各免疫器官指数均呈增大的趋势,其中,D、E组21日龄脾脏指数、胸腺指数、法氏囊指数均显著高于对照组(P<0.05),各试验组42日龄脾脏指数和法氏囊指数均显著高于对照组(P<0.05)。(3)与对照组相比,C、D、E组新城疫抗体滴度、血清溶菌酶含量和T淋巴细胞比例均显著提高(P<0.05)。由此可见,在肉仔鸡日粮中添加一定水平酵母细胞壁多糖能明显提高肉鸡的生长性能,增强机体免疫力,综合考虑,最适宜的添加水平为2000 mg/kg。This experiment was conducted to explore the effects of yeast polysaccharide（YP） on growth performance and immune indices of broilers.A total of 200 1-day-old AA broiler chickens were randomly assigned to 5 groups with 5 replicates of 8 each.group A（control group）was fed corn soybean meal dites,group B、C、D、E were fed basal diet supplemented with 500,1000,1500,2000 mg/kg YP.The experiment lasted for 42 days.The results showed that：（1）Compared with the control group,the average daily gain,average daily feed intake and ratio meat to feed of group C,D,E showed no significant difference（P 0.05） before the 21 th day of the experiment.the average daily gains,and the ratio of diet to meat significantly improved in 21 ～ 42 day and the whole experimental stage（P 0.05）.（2）With YP adding level increasing.The immune organs index increased.Spleen,thymus and bursa of fabricius indexes of group D and group E were significantly higher than those of control groupat 21-day age（P 0.05）.Bursa of fabricius indexes and spleen indexes of all experiment groups were significantly higher than those of control group at 42-day age（P 0.05）.（3）The titre of newcastle disease,the content of serum lysozyme and the percentage of T lymphocytes significantly increased,compared with the control group（P 0.05）.The results indicated that adding YP in the diet could enhance growth performance,improve immunity of broilers,the feasible adding level was 2000 mg/kg in diets.

关 键 词：酵母细胞壁多糖 肉仔鸡 生长性能 免疫指标 

分 类 号：S816.4[农业科学—饲料科学]