Eight broiler chicken diets were produced by using 2 pellet conditioning temperatures (65 and 85°C) and 4 pellet retention times in the conditioner (3, 9, 14, and 20 s). The effect of dietary treatments on pellet physical quality (intact pellet percentage, pellet hardness, pellet durability index, and water activity), growth performance (0 to 21 and 0 to 42 d), apparent ileal digestibility (CAID) of dry matter, crude protein and starch, and ileal digestible energy (IDE) was evaluated. 1,536 broiler chickens were randomly assigned to 8 dietary treatments (8 replicates of 24 chickens each). On d 42, 2 chickens per replicate were randomly selected for ileal content collection to evaluate dietary CAID and IDE. The greater conditioning temperature (85°C) improved pellet percentage, durability, and hardness (P < 0.001), and promoted greater feed intake, but also increased feed conversion by 1.2% (0 to 42 d, P < 0.05). The retention time of 20 s enhanced both weight gain and feed conversion (P < 0.05). Multiple interactions were observed for digestibility traits (P < 0.001). At 65°C, CAID of dry matter, crude protein and starch, and IDE increased with longer retention times. However, all digestibility coefficients and IDE decreased when diet was conditioned at 85°C and retained for more than 9 s. In conclusion, conditioning at 85°C with longer retention times improved pellet physical quality, but reduced digestibility traits and growth performance of broiler chickens. However, conditioning at 65°C with retention times shorter than 14 s also had detrimental effects on ileal nutrient digestibility, digestible energy, and growth performance.

通过在2个颗粒调节温度（65和85°C）和4个颗粒保持时间（3、9、14和20 s）中生产八种肉鸡日粮。日粮处理对颗粒物物理质量（完整颗粒物百分数，颗粒物硬度，颗粒物耐用性指数和水分活度），生长性能（0至21和0至42 d），干物质的表观回肠消化率（CAID），原油的影响蛋白质和淀粉，以及回肠消化能（IDE）进行了评估。将1,536只肉鸡随机分配到8种饮食治疗中（每8只重复24只鸡）。在第42天，每个重复试验随机选择2只鸡用于回肠内容物收集以评估饮食CAID和IDE。较高的调节温度（85°C）提高了颗粒率，耐久性和硬度（P<0.001），并促进了更大的采食量，但饲料转化率提高了1.2％（0至42 d，P <0.05）。20 s的保留时间提高了增重和饲料转化率（P <0.05）。观察到多种相互作用的消化性状（P<0.001）。在65°C下，干物质，粗蛋白和淀粉以及IDE的CAID随着保留时间的延长而增加。但是，当饮食在85°C下放置并保持9 s以上时，所有消化系数和IDE均降低。总之，在85°C的条件下保留时间更长的条件改善了颗粒的物理质量，但降低了肉鸡的消化性状和生长性能。但是，在65°C的条件下保持时间短于14 s的条件对回肠养分消化率，可消化能量和生长性能也有不利影响。