本试验旨在研究玉米、豆粕不同粉碎粒度组合对肉鸡饲料加工质量及肉鸡生长性能的影响。试验饲粮中玉米分别采用2.0、2.5和3.0 mm 3种筛片孔径进行粉碎，豆粕分别采用1.5、2.0和2.5 mm 3种筛片孔径进行粉碎，不同筛片孔径粉碎的玉米和豆粕两两组合成9个不同粉碎粒度处理组合，采用同一饲粮配方和制粒参数进行加工调制。试验选用22日龄的肉鸡900只，随机分为9个组，分别采食9个不同粒度组合处理的饲粮，每个组5个重复，每个重复20只鸡，进行为期21 d的肉鸡饲养试验。结果表明：1）玉米、豆粕分别采用3.0和1.5 mm筛片孔径粉碎处理，颗粒饲料的颗粒耐久性指数和颗粒硬度最大；玉米、豆粕分别采用2.5和1.5 mm筛片孔径粉碎处理，颗粒饲料的颗粒耐久性指数和颗粒硬度最小。2）玉米、豆粕均采用2.5 mm筛片孔径粉碎处理，肉鸡的平均末重和平均日增重最高，料重比最低。3）玉米和豆粕的粉碎粒度及二者的交互作用对肉鸡粗蛋白质、能量和干物质的表观消化率以及肉鸡的全净膛率、肌胃相对重量和腺胃相对重量的影响均不显著（P>0.05）。由此可见，22~42日龄肉鸡饲粮中玉米和豆粕都采用2.5 mm筛片孔径粉碎，即玉米和豆粕几何平均粒径分别为348.38和450.46 μm时，肉鸡的生长性能最佳。

The purpose of this experiment was to study the effects of different crushing particle size combination of corn and soybean meal on the processing quality of broiler feed and growth performance of broilers. The corn in the test diet was pulverized by using three sieve apertures of 2.0, 2.5 and 3.0 mm, respectively. And the soybean meal was crushed by using three sieve apertures of 1.5, 2.0 and 2.5 mm, respectively. The two groups of corn and soybean meal were combined into 9 different crushing particle size treatment combination, and processed and modulated by the same diet formula and granulation parameters. A total of 900 broilers of 22-day-old were randomly divided into 9 groups, and 9 diets with different particle size combination were used for each group, 5 repetitions for each group and 20 chickens for each repetition. The broiler feeding experiment lasted for 21 d. The results showed as follows:1) the particle durability index and particle hardness of the pellets treated with 3.0 mm sieve for corn and 1.5 mm sieve for soybean meal were the largest, while the particle durability index and particle hardness of the pellets treated with 2.5 mm sieve for corn and 1.5 mm sieve for soybean meal were the smallest. 2) Both corn and soybean meal were treated with a 2.5 mm sieve aperture crushing treatment, the average final weight and average daily gain of broilers were the highest, and the feed to gain ratio was the lowest. 3) The crushing particle sizes of corn and soybean meal and the interaction between the two had no significant effects on the apparent digestibility of crude protein, energy and dry matter, the eviscerated yield, and the relative weight of muscular stomach and glandular stomach of broilers (P>0.05). It is concluded that the corn and soybean meal in the 22 to 42 days old broiler diets are both crushed by the 2.5 mm sieve, when the geometric average particle sizes of corn and soybean meal are 348.38 and 450.46 μm respectively, the growth performance of broilers is the best.