本试验旨在研究日粮添加不同水平维生素B₂（VB₂）对笼养蛋雏鸭（1～28日龄）生长性能、内分泌及抗氧化能力的影响。选用1日龄平均体重相近(43.13±1.19) g的金定蛋雏鸭288只，采用单因素随机分组试验设计，随机分为6组（分别饲喂在基础日粮中添加0、4、6、10、20、50 mg/kg VB₂的试验日粮），每组6个重复，每个重复8只鸭，试验期为4周。试验结果显示：与对照组相比，(1)日粮添加10 mg/kg VB₂蛋雏鸭日增重显著升高，料重比显著降低 （P<0.05）；日粮添加10~20 mg/kg VB₂血清T-AOC、SOD、GSH-PX活性和肝脏CAT、GSH-PX活性显著升高 （P<0.05），MDA活性显著降低 （P<0.05）；日粮添加10~20 mg/kg VB₂ 血清T-3浓度显著升高 （P<0.05）；(2)随着VB₂添加水平的提高，生长性能与抗氧化能力呈现先增加后降低的趋势。由此得出，日粮添加10 mg/kg VB₂能显著增强蛋雏鸭的生长性能和抗氧化能力,VB₂添加过高过低都会阻碍抗氧化和促进生长能力的发挥。

The experiment was conducted to study the effects of vitamin B₂ (VB₂) on the growth performance, endocrine and antioxidant capacity of laying ducklings in cage. Two hundred and eighty  eight 1-day-old  Jinding ducklings with an average body weight of (43.13±1.19) g were randomly allotted to 6 groups with 6 replicates of 8 ducks in each replicate. The ducklings in six groups were fed basal diet with 0, 4, 6, 10, 20 and 50 mg/kg VB₂, respectively. The results showed that: compared with control group, (1) for the diet with 10 mg/kg VB₂, average daily gain (ADG) increased significantly (P<0.05) and feed∶gain (F∶G) decreased significantly (P<0.05); the activities of T-AOC, SOD, GSH-PX in serum and CAT, GSH-PX in liver increased significantly(P<0.05) for the diet with10~20 mg/kg VB₂, while the activities of MDA decreased significantly (P<0.05); (2) along with the increase of VB₂ levels, the antioxidant capacity and growth performance showed the trend of first increase and then decrease. In conclusion, the growth performance and antioxidant capacity of laying duckings could be improved by adding 10 mg/kg VB₂ to the diet. However, both a too and a too low level of vitamin B₂ could affect the performance and antioxidant capacity of laying ducklings in cage.