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Problems can occur mixing breeds in a flock when you have, say, six chickens that are very similar looking (like Rhode Island Reds and New Hampshire Reds) and then one chicken who is of a very different type, like a Polish or a Faverolles.
-a rooster can easily mate with a dozen or more hens and fertilize their eggs-. Breeders will often separate a rooster with just one hen or maybe up to 5 or 6 hens for optimal breeding purposes, but I've had as many as sixteen hens and only one rooster - and nearly every egg I cracked open was fertile.