Hens are not faithful to one rooster. In a flock there is one alpha rooster and then subordinate roosters under him. The alpha rooster will claim a small group of hens as “his.” Other roosters will claim flocks of their own if there are enough hens to go around and they are tough enough to fight for them. read more
Invariably when you have a flock of hens without a rooster, one hen climbs to the top of the pecking order and exhibits some of the mannerisms of a rooster. Including, alas, crowing in the morning. This seems to be a means of demonstrating that they're top hen, and it may serve as protection for the flock as well. read more