Help translate a joke into English, not online.

A reporter interviewed a farmer. He asked: If you had two houses, the government wanted you to donate them, would you?

The farmer replied: Yes, I do.

Reporter: If you have 2 million yuan and the government needs it, will you donate it?

The farmer replied: Yes, I do.

Then the reporter asked: If you have two cows and the government needs them, will you donate them all?

The farmer replied, no, I won't.

The reporter asked: Why?

The farmer replied: Because I really have two cows!