[sooyoo]

Yes, it's correct that a majority of larger scale dairy farming today practices this. The usual argument is that it reduces separation stress (since the calf is assumed to be too young to remember and the cow didn't yet get used to having it by its side), but that argument does not have actual scientific evidence.

But it's far from impossible to avoid. There are farms that keep calves with their moms for the first months and this is an active topic of academic research in animal welfare groups around the world, mostly in Europe. There are some drawbacks, like obviously the calf drinks some of the milk that otherwise could be sold, but there are advantages too, like calves growing faster and having better health which could compensate for these effects, but again, this is still being researched.

So, it's not even clear that it's economically better to separate cow and calf right after birth (dairy industry is quite conservative and slow to adopt change.) But even if there is an economic hit, it's not so big and consumers who care could just pay more. It could eventually be included in regulations for dairy farming, and until then, people who care (like you and me) can voluntarily buy milk from farms that practice keeping them together. Apart from being better for the animals, it also shows farmers and regulators that people care and this can work.

I respect you going vegan, but for this particular problem there are solutions and it seems like there are worse things that we do to animals.