本试验旨在探讨铁和维生素A及其互作效应对产蛋鸡生产性能和血清激素水平及铁代谢的影响。采用3×2(铁×维生素A)完全随机试验设计，选用27周龄商品代海兰褐产蛋鸡432只，随机分为6个处理，每个处理6个重复，每个重复12只鸡，试验期8周，分27～30周龄和31～34周龄2个阶段。日粮中铁的添加量为0、30、60 mg/kg，维生素A的添加量为4 000、8 000 IU/kg。结果表明：1）日粮铁的添加水平对产蛋鸡产蛋率、平均日采食量、料蛋比和血清生长激素水平、铁含量、总铁结合力、铁饱和度的影响均不显著(P>0.05)，但可显著提高平均蛋重、血清胰岛素水平和铜蓝蛋白活力(P<0.05)；2）日粮维生素A的添加水平对产蛋率、平均蛋重、平均日采食量、料蛋比和血清生长激素水平、胰岛素水平、铁饱和度的影响均不显著(P>0.05)，但可显著提高血清铁含量、总铁结合力及铜蓝蛋白活力(P<0.05)；3）铁和维生素A互作效应对产蛋率、平均蛋重、平均日采食量、料蛋比和血清生长激素水平、胰岛素水平、铁含量、总铁结合力、铁饱和度的影响均不显著(P>0.05)，但对血清铜蓝蛋白活力的影响显著(P<0.05)。结果提示常规日粮中添加铁没有明显改善产蛋鸡的生产性能，维生素A促进了铁的吸收。

The study was conducted to investigate the effects of iron and vitamin A on performance, hormone levels in serum and metabolism of iron in laying hens. A 3×2 (iron×vitamin A) completely random experiment was designed. A total of four hundred and thirty-two 27-week-old commercial Hyline Brown laying hens were randomly divided into 6 treatments. Each treatment contained 6 replicates with 12 laying hens per replicate. The experiment lasted for 8 weeks which contained two periods of 27～30 weeks of age and 31～34 weeks of age. Iron supplemental levels were 0, 30, 60 mg/kg, and vitamin A supplemental levels were 4 000, 8 000 IU/kg, respectively. The results showed that: 1) laying rates, average daily feed intake, feedegg ratio and the levels of growth hormone, iron, total ironbinding capacity and iron saturation in serum were not significantly affected (P>0.05), but increased average egg weight, insuline levels and ceruloplasmin activity in serum (P<0.05) by dietary supplementation of iron; 2) laying rates, average egg weight, average daily intake, feedegg ratio, and the levels of growth hormone, insuline and iron saturation in serum were not significantly affected (P>0.05), but increased the concentration of iron, total ironbinding capacity, and ceruloplasmin activity in serum (P<0.05) by dietary supplementation of vitamin A; 3) interaction of iron and vitamin A only significantly increased the activity of ceruloplasmin in serum (P<0.05). The results indicated that dietary supplementation of iron did not improve the performance of laying hens, but dietary supplementation of vitamin A promoted the absorption of iron.