本文旨在探讨饲粮蛋白质水平对水貂生长性能、营养物质消化吸收、毛皮品质和血清生化指标的影响。随机选取日龄体重相近的70只健康公水貂平均分至5组，饲喂5个蛋白质水平的饲粮（32%、28%、24%、20%和16%），每千克干物质中含蛋白质分别为326.4、284.7、249.3、203.9和172.8 g。试验组编号分别为P32、P28、P24、P20和P16。从9月中旬至取皮，粗蛋白质的消化率随饲粮蛋白质水平的下降而降低（P<0.01）；P16处理中粗脂肪消化率显著低于其他处理（P<0.01）；日氮食入量、日尿氮排出量和日氮沉积量随饲粮蛋白质水平的增加呈线性增加；血清尿素氮随饲粮蛋白质水平的降低而显著下降（P<0.05），而饲粮蛋白质水平对血清总蛋白质的影响各组间差异不显著（P>0.05）；各组中水貂的体长、皮长和干皮重随饲粮蛋白质水平的降低而呈下降趋势；饲粮蛋白质水平对水貂针毛和绒毛的长度影响差异不显著（P>0.05）。综合考虑各项指标，饲粮蛋白质水平为284.7 g/kg干物质，可消化蛋白质水平为244.5 g/kg 干物质时，能够满足冬毛生长期水貂正常生产的需要。并且，当饲粮蛋白质水平从32%降低到28%时，水貂尿氮排放量可降低22.45%。因此，合理降低饲粮蛋白质水平不仅节约了饲养成本，而且减轻了氮排泄对环境造成的污染。

The study investigated the effects of different dietary protein levels on growth performance, nutrient digestion and absorption, fur characteristics, as well as serum biochemical parameters in growing-furring minks. Seventy healthy male minks were subjected to 5 experimental dietary protein treatments as P32, P28, P24, P20 and P16 [32%, 28%, 24%, 20% and 16% crude protein (CP), respectively], and the measured protein contents of the diets were 326.4, 284.7, 249.3, 203.9 and 172.8 g/kg dry matter (DM), respectively. The results showed that from mid-September to pelting, the digestibility of CP declined with the dietary protein level reducing (P<0.01); digestibility of ether extract in treatment P16 was significantly lower than that in the other groups (P<0.01); nitrogen (N) intake, urinary N excretion and N retention increased linearly with the dietary protein level increasing; serum urea nitrogen decreased linearly with the dietary protein level declining (P＜0.05); there was no significant difference in serum total protein among all groups (P＞0.05); body length, skin length and dry skin weight declined along with the decrease of dietary protein level; and the length of guard-fur and under-fur were not affected by different dietary protein levels (P>0.05). Considering all the factors, the level of dietary protein should be at about 284.7 g/kg DM, and 244.5 g/kg (DM basis) digestible protein could meet the requirement of minks in growing-furring period. Furthermore, the urinary N could be decreased by 22.45% in this period when dietary protein level declined from 32% to 28%, which would be beneficial to reduce the feed costs and lower nitrogen emissions to the environment.