There were studies done a few years back oad'ing holsteins. Dutch i think, didnt end well.
If they are bred for more and your feeding and milking them for less you go straight into energy deficiency and then a few months later you get the problems.
A cow bred and raised for oad would thrive, whereas that animal would not like to be milked 2x at all.
They are 2 different animals, that's my (hopefully less blunt than beefys) take on it anyway.
I'm not planning to feed them less energy than they need. There are other studies with holstein that show the opposite when cows are fed correctly