Loss of feathers - molting or...?

[tiffanya]

I'm not positive where to post this. I have two hens with bare chests. I know broody hens will pluck their chest feathers out but I'm pretty sure neither is broody. They are both 10 months old and my first chickens so I'm not really sure when to look for when they molt. They also have missing feathers on their backs but I figured that was from the roosters. Everything else looks normal at this point. Ideas? What should I expect to see when they molt? Thanks.