Effects of Dietary Eucommia Leaves Extract on Growth Performance and Immune Function of Broilers

This experiment was conducted to investigate the effects of different Eucommialeaves extract level on growth performance and immune function of Arbor Acre(AA)broilers.A total of 275one-dayold AA broilers were randomly divided into 5groups with 5replicates per group and 11 chickens per replicate.Broilers in the control group were fed a basal diet,and the other were fed the basal diets supplemented with 0.05%,0.10%,0.15% and 0.20% Eucommia leaves extract,respectively.The feeding trial lasted for 42 days.The results showed as follows:1)there was no significant difference on the average daily feed intake among all groups(P0.05).Compared with the control group,0.15% supplemental group increased average daily gain(ADG)by 7.42% during 8to 14days(P0.05),and 0.05%,0.10% and 0.15%supplemental groups increased ADG by 26.13%,25.05% and 24.94% during29 to 35days(P0.05),and the feed to gain ratio of 0.05%and 0.15%supplemental groups decreased by 21.15% and 19.34% during 29 to 35days(P0.05).2)There was no significant difference on immune organs index and serum immunoglobulin A content among all groups at 21 and 42days(P0.05).Compared with the control group,the serum immunoglobulin G content in 0.15% supplemental group increased by 23.06%at 21days(P0.05),and the serum immunoglobulin M content in 0.05%,0.15%and 0.20%supplemental groups increased by 118.89%,73.33% and 71.11% at 42days(P0.05).In conclusion,dietary supplemented with Eucommialeaves extract can improved growth performance and immune function of broilers,and the suitable supplemental level is 0.15%.