It was a clear Tuesday morning. While waiting for class to start, I was watching the cows in the field nextdoor. In the field closest to me were 4 cows and a young calf. The calf was lying down next to his mother. It was all peaceful, until the farmer started approaching the paddock on his quad bike. The mother - alerted to danger - got up and stood in front of the calf. The calf, sensing something was up, got up as well and stood close beside his mother. Two of the other cows came to the mother's side, ready to protect the baby from danger. They all watched the farmer approach with wary eyes. He appeared to only be checking up on them, and then he left. But the cows didn't drop their guard until quite a while after that. Only when they were sure it was safe would they go back to doing what they were doing.
You can tell by this story that cows are very maternal animals. They adore their babies. But, in order for humans to drink the milk intended for the calves, dairy cows are denied motherhood. In order to keep lactating, they are repeatedly impregnated, and their beloved children are stolen away from them. Cows produce milk for the same reason all mammals do - to nourish their young. Milk is for calves, not humans.
Respect the rights of others. Go Vegan.