You can't make this stuff up. PETA, everyone's favourite terrorist-supporting wackaloons, wrote an open letter to Ben and Jerry's, asking them to switch from making ice cream with cow milk to... wait for it... human milk.
It's just cruel to milk cows. Cruel and horrendous. You should be ashamed.
But it's okay to do it to humans.
I'm curious where they got the `cows make 10 times more milk than they would naturally` figure. There is no data on cow lactation pre-domestication. Here's the reason why: they've been domesticated since, oh, 7 or 8 thousand years. Aurochs, the progenitor of cattle, went extinct about 400 years ago, and were critically endangered for at least 400-600 years before that. It could be that PETA has unearthed a repository of ancient physiology numbers.
Or, they could just be making stuff up again.