feed metering unit for pigs

例句：

1. 1. The feed metering system is designed to precisely control the amount of feed fed to the pigs.
   这个饲料计量系统被设计用来精确控制给猪的饲料量。
2. 2. The farmer has installed a new feed metering unit to improve the efficiency of feeding his pigs.
   这位农民已经安装了一个新的饲料计量装置，以提高喂养他的猪的效率。
3. 3. The feed metering unit is crucial for maintaining the health and productivity of the pigs.
   饲料计量装置对于保持猪的健康和生产力至关重要。