从1978，BI公司开始出售可以自动分配饲料给母牛的系统给奶牛农场主。
In 1978, BI began selling systems that allowed dairy farmers to dispense feed to their cows automatically.
奶牛必须每年哺乳才能产生牛奶，生下的小牛中只有一半是母牛。
Dairy cows must calve every year to keep producing milk, and only half their offspring will be female.
就算在那个难度已经杀了母牛之王也可以打开奶牛关入口。
Can open Cow Level Portal even when player have kill the Cow King in that difficulty.
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