Effects of dietary Astragalus polysaccharide supplementation on growth,immune function,and disease resistance of Macrobrachium rosenbergii
The experiment was performed to investigate the effects of Astragalus polysaccharide supplementation on the growth,immune function,and disease resistance of Macrobrachium rosenbergii.A total of 1 920 shrimp with the weight of(1.08±0.04)g were randomly assigned to six groups with four replicates per group and 80 shrimp per replicate.The control group(CON group)was fed a basal diet,while the experimental groups were fed a basal diet supplemented with 0.1％(0.1％APS group),0.2％(0.2％APS group),0.3％(0.3％APS group),0.4％(0.4％APS group),and 0.5％(0.5％APS group),respectively.The experiment lasted for 60 days.The results showed that compared with the CON group,0.3％APS group significantly increased the weight gain rate and specific growth rate of Macrobrachium rosenbergii(P＜0.05),while the feed coefficient was significantly decreased in 0.3％APS group,0.4％APS group,and 0.5％APS group(P＜0.05).Compared with the CON group,the serum lysozyme activity of Macrobrachium rosenbergii was significantly increased in 0.4％APS group and 0.5％APS group(P＜0.05).The serum alkaline phosphatase,intestinal trypsin and lipase activities of Macrobrachium rosenbergii were significantly greater in 0.3％APS group,0.4％APS group,and 0.5％APS group compared to the CON group(P＜0.05).After seven days of Aeromonas hydrophila challenge,the cumulative mortality of Macrobrachium rosenbergii in 0.3％APS group,0.4％APS group,and 0.5％APS group was significantly lower than that in CON group(P＜0.05).The study indicates that the growth,immunity,digestive enzyme activity,and disease resistance of Macrobrachium rosenbergii were positively influenced by Astragalus polysaccharide,and the recommended supplemental level is 0.3％.
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