Cattle is an animal species that was made by humans. There were no cows until humans selectively bread other animals to create them. So cows have been specifically designed to live as livestock. But even then it is only quite lately that they have been bread so efficiently that we see variants with serious health problems making them fully dependent on humans for survival.
Cows, like all mammals, only start producing milk when they get close to giving birth. They would then have a calf that would milk them. This ensures their udders stays healthy. As the calf grows up the milk dries out as well until the calf is weened off the milk.
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