bottom grazing

例句：

1. 1. The herdsman must keep the cows on top of their feed to prevent them from bottom grazing.
   牧民必须让牛吃上饲料，防止它们在底部放牧。
2. 2.The farmer has decided to implement a new system for bottom grazing management.
   农民决定实施一种新的底部放牧管理新系统。
3. 3.The animals are being moved to higher ground to avoid bottom grazing and disease transmission.
   动物被移到高地以避免底部放牧和疾病传播。