This study was conducted to investigate the effects of dietary Myriophylium elatinoides on growth performance,slaughter performance and immune organ indexes of Linwu ducks,and to find the suitable supplemental level of Myriophylium elatinoides in Linwu ducks diet.A total of 480 thirty-day-old Linwu ducks with similar body weight were randomly divided into three groups with four replicates per group and forty ducks per replicate.Ducks in group 1( control group) fed a basal diet,and the others in the groups 2...