本试验旨在研究人参多糖对育成期雄性水貂生长性能、营养物质消化率、氮代谢及血清生化指标的影响。采用单因子试验设计，选择70日龄健康、体重相近的雄性水貂40只，随机分成4组，每组10个重复，每个重复1只水貂。Ⅰ组（对照组）饲喂基础饲粮，Ⅱ、Ⅲ、Ⅳ组分别在基础饲粮中添加10、50和100 mg/kg的人参多糖（干物质基础）。预试期7 d，正试期60 d。结果表明:1）Ⅳ组末重（130日龄体重）和平均日增重显著高于对照组（P<0.05）；各组料重比随着人参多糖添加水平升高而逐渐降低，Ⅳ组显著低于对照组和Ⅱ组（P<0.05）。2）Ⅳ组干物质排出量极显著低于对照组和Ⅱ组（P<0.01），Ⅲ、Ⅳ组干物质消化率和粗蛋白质消化率均显著或极显著高于对照组（P<0.05或P<0.01），各组间粗脂肪消化率差异不显著（P>0.05）。3）各组间食入氮、粪氮、尿氮和氮沉积差异不显著（P>0.05）；净蛋白质利用率随着人参多糖添加水平升高而逐渐升高，Ⅳ组显著高于对照组（P<0.05）。4）Ⅱ、Ⅲ、Ⅳ组血清白蛋白含量极显著高于对照组（P<0.01），Ⅳ组血清总蛋白、球蛋白、免疫球蛋白M含量显著高于对照组（P<0.05），各组间血清免疫球蛋白G、免疫球蛋白A、总胆固醇、甘油三酯和葡萄糖含量无显著差异（P>0.05）。由此可见，饲粮中添加人参多糖可提高水貂净蛋白质利用率，进而提高干物质消化率和粗蛋白质消化率，调节血清中免疫球蛋白M含量，提高免疫力，提高生长性能。

This experiment was conducted to investigate the effects of giseng polysaccharide on growth performance, nutrient digestibility, nitrogen metabolism and serum biochemical indices of minks during growing period. The experiment was designed in a single factor. Forty 70-day-old healthy male minks with similar body weight were randomly divided into 4 groups with 10 replicates per replicate and 1 mink per replicate. The control group (group Ⅰ) was fed a basal diet, and groups Ⅱ, Ⅲ and Ⅳ were fed the experimental diets supplemented with 10, 50 and 100 mg/kg giseng polysaccharide (based on dry matter), respectively. The pretest period lasted for 7 days and the formal period lasted for 60 days. The results showed as follows:1) the final body weight (body weight at 130 days of age) and average daily gain in group Ⅳ was significantly higher than those in control group (P<0.05); the ratio of feed to gain (F/G) was decreased with the giseng polysaccharide supplemental level increasing, and the F/G of group Ⅳ was significantly lower than that in control group and group Ⅱ (P<0.05). 2) The dry matter output in group Ⅳ was significantly lower than that in control group and group Ⅱ (P<0.05), the dry matter digestibility and crude protein digestibility in groups Ⅲ and Ⅳ were significantly higher than those in control group (P<0.05 or P<0.01), no significant difference was found in crude fat digestibility among all groups (P>0.05). 3) No significant difference was found in nitrogen intake, fecal nitrogen, urine nitrogen and nitrogen retention among all groups (P>0.05); the net protein utilization was increased with the giseng polysaccharide supplemental level increasing, and the net protein utilization in group Ⅳ was significantly higher than that in control group (P<0.05). 4) The serum albumin content in groups Ⅱ, Ⅲ and Ⅳ was significantly higher than that in control group (P<0.01), the content of total protein, globulin and immunoglobulin M in serum was significantly higher than that in control group (P<0.05), no significant difference was found in the content of immunoglobulin M, immunoglobulin A, total cholesterol, triglycerides and glucose in serum among all groups (P>0.05). In conclusion, dietary supplemented with giseng polysaccharide can increase the net protein utilization of minks, then improve the dry matter digestibility and crude protein digestibility, regulate the serum immunoglobulin M content, enhance immunity, and improve the growth performance.