Pity isn't it, they are always so lovely looking and are only wee boys at the start, but they do grow up to be big pests and the longer you wait the more difficult it is to kill them (physically and emotionally). As someone said to me, 'there is no such thing as a lot of hens, only a lot of cockerels' and you will discover this is the case if you keep breeding. Personally I don't breed them any more, I felt too sorry for them, I don't let my hens sit. But as other people have already said, you have to get used to the killing thing if you are going to breed.