cow-calf system

例句：

1. 1. The cow-calf system is a common method of feeding young calves in agriculture.
   牛犊系统是农业中喂养小牛的常见方法。
2. 2.In the cow-calf system, the mother cow and her calf are separated during the weaning process.
   在牛犊系统中，母牛和她的幼崽在断奶过程中被分开。
3. 3. The cow-calf system has been widely adopted in many countries due to its efficiency and sustainability.
   由于其效率和可持续性，牛犊系统已被许多国家广泛采用。