Jokes in Translation

So my sister just came back from the Middle East and told me this joke in Arabic. Here it is roughly translated.

So a farmer buys three chickens. And the next day he goes out to them to collect the eggs. The first chicken gives him 4 eggs as does the second. Then he goes to the third and only gets two. The farmer yells at the chicken, saying "why did you only make two eggs when they made four each?" The third chicken says "hey! Cut me some slack. I'm a rooster!"