本试验旨在根据肉鸡氨基酸需要模型，研究细分饲粮氨基酸供给对肉鸡生长性能、屠宰性能、营养物质采食量及肠道发育的影响。选取1日龄爱拔益加（AA）肉公鸡192只，随机分为4个组，分别为A组（2阶段）、B组（3阶段）、C组（6阶段）和D组（12阶段），每组6个重复，每个重复8只鸡，试验期42 d。结果表明：1）A组肉鸡平均日增重（ADG）显著高于B、C和D组（P<0.05）。A、B、C组之间肉鸡平均日采食量（ADFI）差异不显著（P>0.05），均显著高于D组（P<0.05）。A组肉鸡料重比（F/G）显著低于B、C和D组（P<0.05）。2）B组肉鸡屠宰率显著高于A、C和D组（P<0.05）。B组肉鸡全净膛率显著高于C和D组（P<0.05），与A组差异不显著（P>0.05）。A组肉鸡胸肌率显著高于B、C和D组（P<0.05）。A组肉鸡腹脂率显著低于B、C和D组（P<0.05）。3）D组肉鸡代谢能采食量显著低于A、B和C组（P<0.05）。A组肉鸡粗蛋白质及赖氨酸采食量显著高于B、C和D组（P<0.05），B、C组肉鸡粗蛋白质及赖氨酸采食量显著高于D组（P<0.05）。A组肉鸡蛋氨酸采食量显著高于B和D组（P<0.05）。A组肉鸡含硫氨基酸采食量显著高于B和D组（P<0.05）。D组肉鸡苏氨酸采食量显著低于A和C组（P<0.05）。4）A组肉鸡十二指肠绒毛高度、绒毛高度/隐窝深度（V/C）值显著高于B、C和D组（P<0.05）。各组肉鸡空肠、回肠绒毛高度、隐窝深度及V/C值差异不显著（P>0.05）。5）42日龄，A组肉鸡体重显著高于B、C和D组（P<0.05），B和C组肉鸡体重显著高于D组（P<0.05）。B、C和D组肉鸡单位增重成本与A组相比差异不显著（P>0.05）。综上，2阶段饲喂能够促进肉鸡十二指肠发育，提高肉鸡营养物质采食量。综合生长性能、屠宰性能及单位增重成本考虑，建议采用2阶段肉鸡饲喂方式。

This experiment was conducted to investigate the effects of dynamic supply of amino acids on growth performance, carcass performance, nutrients intake and intestine development of broilers according to the amino acid requirement model. A total of 192 one-day-old Arbor Acres broilers were randomly assigned into 4 groups as group A (2 phases), group B (3 phases), group C (6 phases) and group D (12 phases), respectively. Each group was represented by 6 replicates with 8 broilers per replicate. The experiment lasted for 42 days. The results showed that: 1) average daily gain of broilers in group A was significantly higher than those in groups B, C and D (P<0.05). Average daily feed intake of broilers among groups A, B and C showed no significant differences (P>0.05), while was all significantly higher than those in group D (P<0.05). The ratio of feed to gain of broilers in group A was significantly lower than those in groups B, C and D (P<0.05). 2) Slaughter rate of broilers in group B was significantly higher than those in groups A, C and D (P<0.05). Eviscerated percentage of broilers in group B was significantly higher than those in groups C and D (P<0.05), meanwhile showed no significant differences compared with group A (P>0.05). Percentage of breast muscle of broilers in group A was significantly higher than those in groups B, C and D (P<0.05), however percentage of abdominal fat of broilers in group A was significantly lower than those in groups B, C and D (P<0.05). 3) The metabolizable energy intake of broilers in group D was significantly lower than those in groups A, B and C (P<0.05). The protein and lysine intakes of broilers in group A were significantly higher than those in groups B, C and D (P<0.05), which in groups B and C were significantly higher than those in group D (P<0.05), too. The methionine intake of broilers in group A was significantly higher than those in groups B and D (P<0.05). Sulfur-containing amino acid intake of broilers in group A was significantly higher than those in groups B and D (P<0.05). The threonine intake of broilers in group D was significantly lower than those in groups A and C (P<0.05). 4) Villus height and the ratio of villous height to crypt depth (V/C) in duodenum of broilers in group A were significantly higher than those in groups B, C and D (P<0.05). However there were no significant differences among 4 groups in villus height, crypt depth and V/C in both jejunum and ileum (P>0.05). 5) At 42 days of age, body weight of broilers in group A was significantly higher than that in groups B, C and D (P<0.05), while which in groups B and C was significantly higher than that in group D (P<0.05). The cost of unit live weight gain of broilers in groups B, C and D showed no significant differences compared with group A (P>0.05). In conclusion, the findings in this study reveal that 2 phases feeding can promote the development of duodenum and improve the feed intake of broilers. Comprehensive consideration of growth performance, carcass performance and unit weight gain cost, it is recommended to adopt 2 phases feeding in broilers.