An interviewer asks a shepard

An interviewer asks a shepard

Interviewer: How much milk do these cows give?

Farmer: Which one? The Black ones or the brown ones?

Interviewer: Brown ones.

Farmer: A couple of litres per day.

Interviewer: And the black ones?

Farmer: A couple of litres per day.

Interviewer(naturally a bit flummoxed): I see. What do you give them to eat?

Farmer: Which ones? Black or brown?

Interviewer: Black.

Farmer: It eats grass.

Interviewer: And the other ones?

Farmer: Grass.

Interviewer(now annoyed) : Why do you keep asking which one when the answers are the same?!

Farmer: Because the black ones are mine.

Interviewer: Oh, and the brown ones?

Farmer: they are also mine