Abstract:

Abstract:The chickens made the mode that infect IBDV on 21 days old. Before infection, the extractive of Echinacea purpurea and Astragalus membranaceus(Fish.) Bge.in difference concentrations are durative fed for 7 days on the 14 days old by gavage. The drug mixed ratio is 1:3 of Echinacea and Astragalusratio.The aim is to clear the differences in immune organ index and the dynamic changes of blood biochemical parameters after fed Echinacea purpurea, Astragalus .The result claimed that group F is significant than others. About biochemical indicators of blood, the Ast / Alt is significant differences at the P<0.01 level between Treatment group with group E. Means that Echinacea purpurea、Astragalus significantly reduced IBD in chickens infected with the damage caused by the body and effect to prevent the disease, thereby enhancing the effectiveness of vaccine-preventable.