Compared with the open pattern,raising density is ncreased,producution of layers is improved,body weight of broilers is gained,mortality is reduced and feed efficiency is enhanced as well.

• 与敞开式相比较，增加了实验密度，蛋鸡提高了产蛋量，肉鸡增加了个体重，鸡只死亡率下降，饲料得益率提高。