本试验旨在研究饲粮蛋白质水平对育成期水貂营养物质消化率及生长性能的影响。选择45日龄健康雄性水貂60只，随机分成6组，每组10个重复，每个重复1只貂。6组水貂分别饲喂蛋白质水平为28%(Ⅰ组)、30%(Ⅱ组)、32%(Ⅲ组)、34%(Ⅳ组)、36%(Ⅴ组)、38%(Ⅵ组)的试验饲粮。预试期7 d，试验期60 d。结果表明，Ⅳ组的采食量和干物质采食量显著高于Ⅱ组（P<0.05）。Ⅳ组的干物质、蛋白质和脂肪消化率显著或极显著高于Ⅰ和Ⅴ组(P<0.05或P<0.01)，与其他各组差异不显著(P>0.05)。Ⅳ组的磷消化率显著高于Ⅱ和Ⅵ组(P<0.05)，与其他各组差异不显著(P>0.05)。随着饲粮蛋白质水平的增加，食入氮和尿氮随之提高(P<0.05或P<0.01)，但对粪氮、氮沉积、净蛋白质利用率及蛋白质生物学价值没有显著影响(P>0.05)。Ⅳ、Ⅴ和Ⅵ组的平均日增重、料重比极显著优于Ⅰ组(P<0.01)。由此得出，饲粮蛋白质水平达到34%时，各种营养物质消化率、平均日增重及料重比较为理想。

This study was conducted to study the effects of nutrient digestibility and growth performance of growing minks. Sixty healthy male mink at the age of 45-day-old were randomly divided into 6 groups with 10 replicates in each group and 1 mink per replicate. The mink in 6 groups were fed experimental diets with protein levels of 28% (group Ⅰ), 30% (group Ⅱ), 32% (group Ⅲ), 34% (group Ⅳ), 36% (group Ⅴ) and 38% (group Ⅵ), respectively. The trial lasted for 60 days. The results showed as follows: the feed intake and dry matter (DM) intake of the groups Ⅵ, Ⅴ and Ⅵ were significantly higher than those of group Ⅱ (P<0.05). The digestibility of DM, protein and fat of group Ⅳ were significantly higher than those of groups Ⅰ and Ⅱ (P<0.05 or P<0.01). No significant difference on digestibility of DM, protein and fat were found between group Ⅳ and other groups (P>0.05). The P digestibility of group Ⅳ was significantly higher than that of groups Ⅰ and Ⅴ (P<0.05), but there was no significant difference between group Ⅳ and the others (P>0.05). With the increase of dietary protein levels, nitrogen intake and urine nitrogen were increased (P<0.05 or P<0.01). The fecal nitrogen, nitrogen deposition, net protein utilization, biological value of protein were not significantly affected by dietary protein levels (P>0.05). The average daily gain and F/G of groups Ⅳ, Ⅴ and Ⅵ were significantly greater than those of group Ⅰ (P<0.01). In conclusion, when the protein level of diet arrived at 34%, the nutrient digestibility, average daily gain and F/G of growing minks were optimal.［Chinese Journal of Animal Nutrition, 2010，22（4）:1101-1106］