Cow Meetings

The other day at dinner, I offered Lyra a bite of my tasty meatloaf.

Lyra: Is that cow?
Me: Yes [I used to answer that question with - No, it's meat. But that doesn't work any more.]
L: I don't eat cow.
M: Why not?
L: I like to save the cows so we can have milk.
M: Well, the cows that give milk aren't usually the same as the cows we eat.
L: Why not?
M: Only girl cows give milk and usually the cows we eat are boys.
L: Nuh-uh. Boy cows give milk, too.
M: No, just girl cows.
L: Nuh-uh. What if the mama cow is gone, the baba needs to feed the baby cow.
M: Well, the mama cow is never gone. It's always the mama that feeds the baby. Only mama cows have the udders to hold the milk.
L: Nuh-uh, baba cows have milk. What if the mama cow needs to go to a meeting and talk to other cows? The baba needs to feed the baby.
M: [Imaging the cow meeting] Well, mama cows don't really go to meetings they are always taking care of the baby.
L: What if the farmer takes the mama cow's milk? Then the baby wouldn't have anything to eat? Who would feed the baby then?
M: The farmer knows which mama cows have babies and he doesn't take their milk. He leaves it for the baby to eat.

It ended there, but she's still not convinced.