molting...I think?????

[thehappyfarmerchick]

I have 3 hens, who have all lost there feathers on theirs backs, and cant seem to re-grow any new feathers. they are all 3 pretty much bald on there backs. how long should it take for a chicken to molt? is this normal? I have checked for mites and lice and have not discovered either. what could I do to help speed up the process, so they will grow feathers? they look awful.

 

[bawkbawk]

other posts have suggested bumping up their protein intake--some plain yogurt or meat