Ok so I have a mixed flock. I have Austrolarps, easter eggers, bards, and some buff orpington. Now all are mixed in the pen but are pure (hatchery) and I have several roosters witch I did for genetic diversity.....it's what I tell my self but really they are just pretty birds lol. So here is my question I have a bard rooster also a pretty sexlink roo that would produce bards, and hens and I also have buff orpington roos and hens. How long would I have to pen the breeding birds separately and not incubate the eggs before I was sure they were only fertilized by the chosen roo?