White one or black one?

Tourist trying to get chummy with a shepherd: You've got a nice flock of sheep here...how much wool you get from each?
Shepherd: From which one...black ones or white ones?
T: Black?
S: 3 kgs.
T: What about white ones?
S: 3 kgs.
Tourist: Ok? How much milk do they give?
S: Which ones? Black or white?
T: Black
S: 3 lts
T: And what about white?
S: They also give 3 lts
T: haha...very funny...
S: Is that?
T: Well...how much meat would I get from one of them?
S: From black or white?
T (a li'l cautiously): Okay?...White?
S: 30 kgs
T: And black?
S: Also 30 kgs
T (now a li'l offended): Well you are a smartass, aren't you? I was going to purchase one from you for meat...but since obviously you're trying to mess with me...you lose the deal buddy!
S: Oh no, no...it's not like that...You see I have to answer for them separately because the black ones are my father's!
T: And the white ones?
S: They're my father's too!