Back in march i bought 10 red sex link hens that were 13 months old. They are good birds, lay everyday like clockwork. Now i notice a couple of them are starting to lose feathers on their backs and some wig feathers as well. It seems new feathers are coming in but im not 100% sure about that yet. Is this normal? Are they at the right age (15 months) and the right time of year for molting? I thought it happened in the fall not late spring