本试验旨在研究饲粮中添加不同水平的谷氨酰胺（Gln）对夏季水貂生长性能、血清生化指标及抗氧化能力的影响。选取育成期水貂160只，随机分为5组，每组32只（16只公貂，16只母貂），水貂单笼饲养。对照组水貂饲喂不添加Gln的基础饲粮，试验组水貂分别饲喂在基础饲粮基础上添加0.2%、0.4%、0.6%和0.8% Gln的试验饲粮。试验期8周。结果表明：饲粮中添加0.4%和0.6%的Gln可显著提高母貂的平均日采食量（P<0.05）；饲粮中添加0.4%的Gln可极显著提高水貂的平均日增重（P<0.01），并显著降低水貂的料重比（P<0.05）。饲粮中添加Gln对水貂血清葡萄糖含量和肌酸激酶活性无显著影响（P>0.05），但添加0.4%和0.6%的Gln可显著提高血清总蛋白含量（P<0.05），显著降低血清尿素氮含量（P<0.05）。饲粮中添加0.2%和0.4%的Gln可显著提高水貂血清抑制羟自由基能力（P<0.05），但对血清抗超氧阴离子能力无显著影响（P>0.05）；饲粮中添加0.4%和0.6%的Gln可显著降低水貂血清丙二醛含量（P<0.05），极显著提高血清总抗氧化能力（P<0.01），显著提高血清谷胱甘肽过氧化物酶活性（P<0.05）。综合各项指标，夏季高温条件下，育成期水貂饲粮中Gln的适宜添加水平为0.4%。

This experiment was conducted to study the effects of glutamine on growth performance, serum biochemical indexes and antioxidant capacity of minks in summer. One hundred and sixty minks at the growing period were selected and randomly divided into 5 groups. Each group had 16 male minks and 16 female minks, a total of 32 replicates in each group. The minks in control group were fed a basal diet (not adding glutamine), the minks in experimental groups were fed experimental diets which supplemented with 0.2%, 0.4%, 0.6% and 0.8% glutamine on the basis of the basal diet, respectively. The experiment lasted for 8 weeks. The results showed that diet supplmented with 0.4% and 0.6% glutamine could significantly increase the average daily feed intake of female minks (P<0.05), and diet supplmented with 0.4% glutamine could significantly increase the average daily gain of minks (P<0.01), while significantly decreased the feed to gain ratio of minks (P<0.05). Serum glucose content and creatine kinase activity were not significantly influenced by adding glutamine in the diets (P>0.05), but diet supplmented with 0.4% and 0.6% glutamine could significantly increase the serum total protein content (P<0.05), and significantly decreased the serum urea nitrogen content (P<0.05). Diet supplmented with 0.2% and 0.4% glutamine could significantly improve the restraining hydroxyl free radical ability of minks (P<0.05), but there was no effect on the serum superoxide anion resistance ability (P>0.05). Diet supplmented with 0.4% and 0.6% glutamine could significantly decrease the serum malondialdehyde content (P<0.05), significantly increase the serum total antioxidant capacity (P<0.01), and significantly increase the serum glutathione peroxidase activity of minks (P<0.05). Taking into account of each index in this experiment, the suitable supplemental level of glutamine in diets of minks in summer is 0.4%.