Cow produces milk for it's calves.  We steal the milk that is meant for her baby and worship her as our mother in return!

If Cows could speak I am sure she will say: "Please eat me later and spare the milk for my baby."

Poor bhaisiz they become MOMO and Dahi at the same time you know why because Our religion says it is the devil Mahisasur so good to kill and eat. As for Cow it's holy because somebody said so.