Never understood why the Machines didn't use cows. I know why the Wachowskis didn't, money. But the Machines are smarter than those brothers.
It wasn't just about energy. The humans were a threat. They tried to destroy the machines by blotting out the sun, their main source of energy.
Then kill the fuckers. Don't farm them.
Many people don't realize this....but in a cows mind, they are part of a matrix where they are being kept alive to produce milk....we are just illusions of their program.
And here I thought we were all just created by the mosquito god as a foodsource for it's chosen people.