本试验旨在研究饲粮灵芝菌糠添加水平对蛋鸭产蛋性能、蛋品质和血清生化指标的影响，以检验灵芝菌糠对蛋鸭的饲喂效果和确定其适宜添加水平。选择204日龄健康且产蛋率接近的临武鸭200只，随机分为5组，每组5个重复，每个重复8羽。对照组饲粮不添加灵芝菌糠，4个试验组饲粮在等氮等能条件下分别添加2%、4%、6%和8%的灵芝菌糠。试验期63 d。结果表明：1）饲粮灵芝菌糠添加水平对蛋鸭的产蛋率和料蛋比均无显著影响（P>0.05）。与对照组相比，2%、4%和6%灵芝菌糠组的合格蛋率、日产蛋重和平均日采食量均无显著差异（P>0.05）；但8%灵芝菌糠组的合格蛋率、日产蛋重和平均日采食量均显著低于其他各组（P<0.05）。对照组和2%、4%灵芝菌糠组的平均蛋重显著高于6%和8%灵芝菌糠组（P<0.05）。2）饲粮灵芝菌糠添加水平对蛋鸭蛋品质指标均无显著影响（P>0.05）。3）6%和8%饲粮菌糠组血清中胆固醇和甘油三酯含量均显著低于对照组（P<0.05）。饲粮灵芝菌糠添加水平对蛋鸭其他血清生化指标无显著影响（P>0.05）。4）以平均日采食量和合格蛋率为评价指标，通过二次曲线模型估测产蛋高峰期临武鸭的饲粮中灵芝菌糠适宜添加水平分别为2.99%和2.38%。由此可见，饲粮中添加6%~8%灵芝菌糠可降低血脂含量，灵芝菌糠在蛋鸭饲粮中的添加水平不超过6%时对蛋鸭产蛋性能和蛋品质均无不良影响，而添加水平达8%时产蛋性能下降。综合考虑，204~266日龄临武鸭饲粮中灵芝菌糠适宜添加水平为2.38%~2.99%。

This experiment was conducted to study the effects of dietary Ganoderma lucidum fungus chaff supplemental level on laying performance, egg quality and serum biochemical indices of laying ducks, in order to test the feeding effect for laying ducks and the optimal supplemental level of Ganoderma lucidum fungus chaff. A total of 200 healthy 204-day-old Linwu ducks with similar laying rate were randomly divided into 5 groups with 5 replicates in each group and 8 replicates in each replicate. The control group was fed a diet without Ganoderma lucidum fungus chaff, and the four experimental groups were fed the diet supplemented with 2%, 4%, 6% and 8% Ganoderma lucidum fungus chaff under the isonitrogenous and isoenergetic condition. The experimental period was 63 days. The results showed as follows:1) dietary Ganoderma lucidum fungus chaff supplemental level had no significant effects on the laying rate and feed/egg of laying ducks (P>0.05). Compared with the control group, the qualified rate of egg, daily egg yield and average daily feed intake of 2%, 4% and 6% Ganoderma lucidum fungus chaff groups were no significant difference (P>0.05), but the qualified rate of egg, daily egg yield and average daily feed intake of 8% Ganoderma lucidum fungus chaff group were significantly lower than those of other groups (P<0.05). The average egg weight of control group and 2% and 4% Ganoderma lucidum fungus chaff groups was significantly higher than that of 6% and 8% Ganoderma lucidum fungus chaff groups (P<0.05). 2) Dietary Ganoderma lucidum fungus chaff supplemental level had no significant effects on the egg quality indices of laying ducks (P>0.05). 3) The contents of cholesterol and triglyceride in serum of 6% and 8% Ganoderma lucidum fungus chaff groups were significantly lower than those of the control group (P<0.05). Dietary Ganoderma lucidum fungus chaff supplemental level had no significant effects on other serum biochemical indices of laying ducks (P>0.05). 4) The dietary optimal supplemental levels of Ganoderma lucidum fungus chaff were 2.38% and 2.99% based on qualified rate of egg and average daily feed intake by quadratic regression, respectively. In conclusion, dietary supplemented 6% to 8% Ganoderma lucidum fungus chaff can reduce serum lipid content, and the dietary supplemental level of Ganoderma lucidum fungus chaff no more than 6% have no adverse effect on the laying performance and egg quality of laying ducks, while the laying performance can decrease when the supplemental level get 8%. Comprehensive consideration, these results suggest that dietary optimal supplemental levels of Ganoderma lucidum fungus chaff for Linwu ducks aged from 204 to 266 days is 2.38% to 2.99%.