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