I have no idea who told you this, but that's 100% false.
http://www.extension.umn.edu/distributi ... 69-05.htmlIn fact, one of the issues of ethics in regards to milk is the fact that you need the calf for the milk, but you don't really
want the calf, because it needs that milk and will drink it if it stays with its mother. Most commercial farms solve this by separating the calf from the mother and feeding it some sort of formula. Some farms (you can probably find a farm or two in your area that does this) separates the calf from the mother either during the day or at night, milking in the evening for the former or the morning for the latter.
But you have to actively seek out these farms. On the plus side, you'll probably get something
other than Holstein milk (which is basically watered-down in the cow and their udders are so large and heavy that they cause the cow extreme pain, sometimes even tearing from the sheer stress). You're also likely to get grass-fed organic milk, which is a heck of a lot better for you than the milk you get in the grocery store.
Of course, that's assuming you drink milk at all (I only go through about a quart per week).
I would not be able to function without those sluty cows.
Tea and cereal are mainstays of my life, and without the milk to act as lifeblood they would be shrivelled up husks of they greatness they currently are.