本试验旨在研究饲粮赖氨酸水平对22~28周龄临武鸭生产性能、蛋品质及血清生化和激素指标的影响，以确定产蛋初期临武鸭的赖氨酸需要量。试验选取147日龄、健康状况良好、体重基本一致、产蛋率无显著差异（P>0.05）的临武鸭125只，随机分成5组（饲粮赖氨酸水平分别为0.65%、0.75%、0.85%、0.95%、1.05%），每组5个重复，每个重复5只鸭。预试期7 d，正试期42 d。结果显示：1）饲粮赖氨酸水平对蛋鸭生产性能无显著影响（P>0.05），但0.95%赖氨酸组获得了除平均蛋重外最佳的生产性能。2）饲粮赖氨酸水平对蛋鸭的蛋壳厚度、蛋白高度、哈氏单位、蛋白比率和蛋黄比率均无显著影响（P>0.05）。0.75%赖氨酸组蛋黄颜色显著高于0.65%和0.95%赖氨酸组（P<0.05），1.05%赖氨酸组蛋形指数显著高于0.85%和0.95%赖氨酸组（P<0.05）。3）饲粮赖氨酸水平对蛋鸭血清葡萄糖、总胆固醇、尿酸、总蛋白、球蛋白含量和碱性磷酸酶、谷草转氨酶、谷丙转氨酶活性无显著影响（P>0.05）。0.75%赖氨酸组血清白蛋白、肌酐含量及白球比显著高于1.05%赖氨酸组（P<0.05），0.95%赖氨酸组血清甘油三酯含量显著或极显著低于0.75%、1.05%赖氨酸组（P<0.05或P<0.01），0.85%赖氨酸组血清尿素氮含量显著高于0.65%赖氨酸组（P<0.05）。4）饲粮赖氨酸水平对蛋鸭血清胰岛素、胰高血糖素含量无显著影响（P>0.05）。0.65%赖氨酸组血清生长激素含量显著或极显著高于0.75%、0.85%和1.05%赖氨酸组（P<0.05或P<0.01）；1.05%赖氨酸组血清皮质醇、三碘甲腺原氨酸（T₃）、甲状腺素（T₄）含量显著或极显著高于0.75%、0.85%赖氨酸组（P<0.05或P<0.01）；0.65%赖氨酸组T₃/T₄显著高于1.05%赖氨酸组（P<0.05）。综上所述，在本试验条件下，饲粮0.65%赖氨酸水平即可满足22~28周龄临武鸭生产需要，而当饲粮赖氨酸水平在0.95%时可获得最佳生产性能。

This experiment was conducted to study the effects of dietary lysine (Lys) level on performance, egg quality and serum biochemical and hormonal indices of Linwu ducks aged from 22 to 28 weeks, and to find the Lys requirement of Linwu ducks in early laying period. A total of 125 healthy 147-day-old Linwu duck with the nearly same body weight and laying rate were randomly selected and divided into 5 groups (dietary Lys level were 0.65%, 0.75%, 0.85%, 0.95% and 1.05%, respectively) with 5 replicates in each group and 5 ducks in each replicate. There was a 7 days adaptation period and a 42 days experimental period. The results showed as follows: 1) dietary Lys level had no significant effects on performance of laying ducks (P>0.05), but 0.95% Lys group obtained the best performance except average egg weight. 2) Dietary Lys level had no significant effects on egg shell thickness, albumen height, Haugh unit, yolk ratio, albumen ratio of laying ducks (P>0.05). The yolk color in 0.75% Lys group was significantly higher than that in 0.65% and 0.95% Lys groups (P<0.05), the egg shape index in 1.05% Lys group was significantly higher than that in 0.85% and 0.95% Lys groups (P<0.05). 3) Dietary Lys level had no significant effects on the contents of glucose, total cholesterol, uric acid, total protein and globulin, and the activities of alkaline phosphatase, glutamic-oxaloacetic transaminase and glutamic-pyruvic transaminase in serum of laying ducks (P>0.05). The contents of albumin and creatinine in serum and the ratio of albumin to globulin in 0.75% Lys group were significantly higher than those in 1.05% Lys group (P<0.05), the serum triglyceride content in 0.95% Lys group was significantly lower than that in 0.75% and 1.05% Lys groups (P<0.05 or P<0.01), the serum urea nitrogen content in 0.85% Lys group were significantly higher than that in 0.65% Lys group (P<0.05). 4) Dietary Lys level had no significant effects on the contents of insulin and glucagon in serum of laying ducks (P>0.05). The serum growth hormone content in 0.65% Lys group was significantly higher than that in 0.75%, 0.85% and 1.05% Lys groups (P<0.05 or P<0.01), the contents of cortisol, triiodothyronine (T₃) and thyroxine (T₄) in serum in 1.05% Lys group were significantly higher than that in 0.75% and 0.85% Lys groups (P<0.05 or P<0.01), and the T₃/T₄ in 0.65% Lys group was significantly higher than those in 1.05% Lys group (P<0.05). In conclusion, in this experimental condition, dietary 0.65% Lys level can fulfil the requirement of Linwu ducks aged from 22 to 28 weeks, and dietary 0.95% Lys level can obtain the best performance.