The aim of this study is to investigate the effects of Astragalus polysaccharides on the growth performance,blood biochemical indicators,and meat quality of meat ducks.16001-day-old cherry valley meat ducks were randomly divided into 4 groups,with 5 replicates in each group,with 80 ducks in each replicate.Add 0,100,200,and 400 mg/kg of Astragalus polysaccharides to the basic diet as experimental diets.The experiment lasted for a total of 35 days.The addition of Astragalus polysaccharides to the diet had a significant effect on the growth performance of meat ducks.Compared with the control group,the 200 mg/kg group increased body weight by 3.8%at 35 days of age,increased average daily weight gain by 3.9%,and decreased feed to weight ratio by 3.3%(P＜0.05).In addition,the addition of Astragalus polysaccharides to the diet had no significant effect on the average daily feed intake of meat ducks(P＞0.05).Adding Astragalus polysaccharides to the feed significantly increased the total serum protein content,copper zinc superoxide dismutase and glutathione peroxidase activity of meat ducks(P＜0.05);Adding 200 and 400 mg/kg Astragalus polysaccharides to the diet significantly increased the serum IgG content of meat ducks(P＜0.05);In addition,adding Astragalus polysaccharides to the diet did not significantly affect the serum albumin,urea nitrogen,IgA,and IgM contents of meat ducks(P＞0.05).Adding 200 mg/kg Astragalus polysaccharides to the diet significantly reduced the brightness,redness,and yellowness of breast muscles in meat ducks(P＜0.05).Adding 200 and 400 mg/kg Astragalus polysaccharides to the diet significantly reduced the dripping loss and shear strength of breast muscles in meat ducks(P＜0.05);In addition,the addition of Astragalus polysaccharides to the diet had no significant effect on the pH of breast muscles in meat ducks(P＞0.05).In summary,under the conditions of this experiment,the optimal amount of Astragalus polysaccharides added to the diet of meat ducks is 200 mg/kg.
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