2 of my 3 chickens have "Baboon butt". I took one of them into the Avian Center (they specialize in backyard chickens and birds). The doctor said she sees this condition in backyard chickens and it's cause is mystery. Apparently it doesn't show up in commercial chickens. Her theory is that it's harmonal. She said that doing a forced molt (feeding the girls no more than 1/2 cup of food a day) seems to reset it, and allows the girls to put their energies back into growing their feathers instead of trying to stay warm. After reading about forced molt on this website, I'm concerned. This is a specialist in backyard pet chickens giving me this advice. Thoughts? Thank you!!