TheFatBlueCat
Crowing
I think feeding animal protein may have some impact. It will be interesting to see what happens during their first major moult.
Well my leghorn and orpington just moulted at 16 months old and it was nothing to write home about. They stopped laying for about 2-3 weeks and there were a lot of feathers laying around. They didn't look much worse for wear except their tails looking pretty rough, and they were cranky.
My araucana hens (who are over 2 years old) have also just moulted but its hard to say with those 2 as they go broody often and raise chicks once or twice a year, so have a little moult for that and that may prevent them needing to do a full moult. They stopped laying for 2 weeks and dropped feathers everywhere they sat. Aside from that, just cranky. They have been getting meat meal daily, but in small quantities (1/2 cup across 11 chickens)