Abstract: Effects of Curcuma zedoaria Rosc. polyszccharide on the antioxidant status and the immunity function in chickens were studied in the experiment. One hundred and sixty 7dayold chickens were randomly divided into four groups,control group(Ⅰ),Cyclophoshamide group(Ⅱ),Cyclophoshamide plus curcuma zedoaria Rosc group(Ⅲ),Curcuma zedoaria Rosc.group(Ⅳ). The phagocytosis ability of blood corpuscle, SOD activity and LPO content of blood serum, and the chickens’ indexes of bursa F and spleen were determined in the blood of each chicken in every group. At the same time, we also observed the structures of bursa F and spleen. The results showed that Curcuma zedoaria Rosc. polyszccharide had an evident effect in eliminating ·OH and O₂- , and the biggest eliminating ratio was 88.91% and 98.5% respectively; SOD activity and LPO content were significantly changed, SOD activity was enhanced 145% and LPO content reduced 40.95%, maximally, comparing with the control group; The weights of all chickens were increased quickly from the second week after treatment, the biggest increase weight was 48.75 g per week; The phagocytosis ratio and index of blood corpuscle, weight and growth speed of bursa F and spleen in group of Curcuma zedoaria Rosc. polyszccharide were increased; The values of antioxidant and immunity functions in the group fed with the cyclophoshamide added Curcuma zedoaria Rosc. polyszccharide were similar to the control group, which it showed that the injury to immune organs by cyclophoshamide could be made up by Curcuma zedoaria Rosc. polyszccharide. All in all, Curcuma zedoaria Rosc. polyszccharide had a antioxidant ability in some degree, could strengthen body immunity ,increase growth performance of chickens, repair injury of tissue.

Key words: Curcuma zedoaria Rosc. polyszccharide, chickens, antioxidant status, immunity function