I have a flock of 15 laying hens and 2 roosters (this count doesn't include the 9 pullets who haven't yet reached POL). It is obvious that many of the hens get alot of action: the 2 BRs, 4 of the 5 golden comets, 2 of the 3 EEs, both white cochins, and the BO. However, the white crested polish, the splash andalusian, 1 comet and 1 EE don't ever get any action. The roosters don't chase them. Granted, of course, I could miss things, although I do watch them alot. But they all have perfect feathers and certainly don't look like the other hens with their poor bald backs! Do roosters sense fertility, or do they maybe simply have taste preferences?