I am a little confused when it comes to mixed flocks. I have seen many pictures where members have multiple breeeds of chickens within a flock and multiple breeds of roos. How do you keep the chickens from cross-breeding? Is there a secret to this I haven't picked up on? For example, if I were going to have a mixed flock of dominiques, orpingtons, and dorkings, for the purposes of this thread it will be a rather large flock, and I wanted to breed each of these breeds true...how would I go about making sure of that? I hope my question makes sense! I will try to rephrase if it doesn't. Thanks!