Why do cows produce milk if they don't have children?
As mammals, cows, like other mammals, have the physiological function of sucking their young. Even if the cow is infertile, its lactation system is still present and can produce milk under certain conditions. This is because the lactation system is regulated by hormones and hormones in the cow's body, which stimulate the mammary glands of the lactating system to produce milk when the cow enters the milking period.
On farms, cows usually start producing milk after giving birth to calves, but this milk is not used to feed the calves. In fact, calves are able to forage for their own food soon after birth and are no longer dependent on the cow's milk. On the contrary, cows produce milk to feed their calves, but also to meet the needs of humans, who domesticated cows so that they produce milk regularly for human consumption.
It is important to note that not all cows produce milk. Only fertile female cows will start producing milk after a period of lactation in the lactation system. Unfarrowing cows do not have the capacity to produce milk.
In short, cows produce milk to feed their calves, while humans raise and domesticate cows so that they produce milk regularly for consumption.