As others have said, wild aurochs, like all mammals, only produce enough milk for enough time to support the life of their baby, and then as the baby is weaned, the milk production tapers off and stops until the next birth. But in addition to that, milk cows have been bred for hundreds of years to produce lots and lots of milk, many time more than aurochs would produce for one calf. This means that a cow is in a much worse position than a wild aurochs when nursing. So they need to be milked frequently, and there’s a lot of milk, meaning if they’re not milked they can suffer serious problems, while a wild animal wouldn’t have nearly the problems because they evolved to cope with not nursing.
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