Our chickens appear to have started molting (bared plymouth rocks). They are about 8 months old and have been laying well since about early September but we are starting to see some off days on egg production and tonight we got home and see two hens with large bald spots on their backs...is this normal? This happened today...last night when I got home and got the eggs they looked okay, molting in tail feather area...but two of them look like they had shaved these areas.... How do you keep the other chickens from pecking on them....they seem to want to peck at the open spots. Should I be putting something on this area? Using DE powder?? Do I need to separate them from the others? First time with molting so any help is appreciated.