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中文摘要：
为了比较评估氨基酸络合铁对生长猪生长性能、铁表观消化率、肤色和血液指标的影响，试验选择70日龄初始体重（27．34±2．55）kg的杜×长×大生长猪108头，分为6个处理，每个处理6个重复，每个重复3头猪。试验用玉米-豆粕型基础日粮。在基础日粮中添加100mg／kg无机铁（-水硫酸亚铁）构成对照组。在对照组基础上分别添加40、80、120、160mg／kg氨基酸络合铁构成4个试验组，在对照组基础上添加160mg／kg无机铁（-水硫酸亚铁）构成正对照组，试验期5周。结果表明：试验0～2周、3～5周及全期，随着日粮中氨基酸铁添加量由40mg／kg增加到160mg／kg，生长猪日增重和饲料转化效率均得到改善，并呈极显著的线性关系（P〈0．01）。与无机铁日粮组相比，添加160mg／kg氨基酸络合铁试验组极显著地改善了平均日增重（P〈0．01）和饲料转化效率（P〈0．05）；试验第14天和第35天，随着日粮中氨基酸络合铁添加水平的增加，生长猪对日粮中铁元素的表观消化率均呈显著的线性增加关系（P〈O．05），添加160mg／kg氨基酸络合铁试验组铁元素的表观消化率极显著高于对照组和正对照组（P〈0．01）；试验第14天和第35天，随着日粮中氨基酸络合铁添加水平的提高，红细胞压积、血红蛋白浓度、血清铁和血清铁与总铁结合力之比都呈显著的线性增加关系（P〈0．05），并高于无机铁日粮组（P〈0．01），而血清总铁结合力呈显著的线性降低关系（P〈0．05）；在试验期末，160mg／kg氨基酸络合铁日粮组显著改善生长猪的肤色状况（P〈0．05）。与添加硫酸亚铁相比，在生长猪日粮中添加氨基酸铁络合物可提高生长猪的生长性能和铁表观消化率，改善皮肤红度及血液生化指标。
英文摘要：
The experiment was carried out to evaluate the effects of iron-amino acid complex on growth performance, iron apparent digestibility, skin color and blood index in growing pigs, as compared to those of feed grade ferrous sulfate. One hundred and eight crossbred growing pigs （Duroc x Landrace x Large White, seventy-day-old）, with an average weight of （27.34±2.55） kg, were randomly allocated into six dietary treatments with six replicates （three pigs per pen）. The control diet included 100 mg/kg iron from ferrous sulfate heptahydrate into the basal corn-soybean diet. The other dietary treatments were supplemented with 40, 80, 120, or 160 mg/kg of iron from iron-amino acid complex in the control diet. An additional diet supplemented with 160 mg/kg of iron from ferrous sulfate heptahydrate into the control diet was used as a positive control. Chromic oxide was included in the diets to act as the marker to determine the iron apparent digestibility. The results showed that the pigs fed iron-amino acid complex as an iron source had a statistically significant improvement in weight gain and feed conversion ratio. The monitored parameters, including mean red cell volume, hemoglobin concentration, serum iron and total iron binding capacity in the blood, skin redness with an ‘a＇ value in color measurement increased significantly as the level of iron-amino acid complex increased （P〈0.05）. Meanwhile, iron apparent digestibility was also increased significantly as the level of iron-amino acid complex increased （P〈0.05）. Therefore, the iron from iron-amino acid complex could improve growth performance and skin color more than ferrous sulfate supplementation in growing pigs.
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