I have a current flock of 12 chickens (all hens) and 3 ducks (2 females and 1 male). My chickens get along well, but I'd still like a rooster. I want a rooster so that I can have fertilized eggs. From what I've read, Cochins are what seem to be the best breed for this situation. First of all, would a mature rooster (about 6-8 months old) be fine with my chickens and ducks and not hurt anyone? Secondly, would the rooster still mate with the hens even though they have been away from each other since hatching?