奶牛和公牛主要用于乳品生产，是农业生产中的主要畜力来源。
Cows and oxen are primarily used for dairy production and are a key source of draft power in agricultural production.
食用了这种玉米的奶牛和公牛也出现了不孕不育症。
Cows and bulls also became infertile when fed the same corn.
通常的红肉源比如奶牛和公牛会排出大量改变气候的气体，比如甲烷。
Common sources of red meat such as cows and bulls produce an enormous quantity of climate-changing gases such as methane.
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