This particular hen started to get a little mothy looking when she started laying.... At first I thought it might be because the other birds were really picking on her while she was on the nest (she was the first to lay), actively pulling her feathers. Now I'm not so sure as it has spread on her body. One other bird is starting to get this fuzzy/fluff look across the top of her back, too, also getting pecked at whilst laying, broken-off feathers. The two non-layers in the coop and two other laying birds do not have this feather anomaly going on. I don't see any obvious mites or parasites. The birds seem healthy in all other respects, normal activities, regular-looking poop. The birds are approaching 6 months old. We've had a couple of weeks of abnormally warm weather (70's in the southwest). Their diet switched to an non-GMO organic 16% layer pellet two weeks before onset of laying. The elevated coop is pine shavings as bedding; the nest boxes are excelsior and pine shavings; the roosts have PDZ underneath. The birds have not been outside, period, as the run hasn't been completed and so no scratching in the dirt or eating bugs. They have not been wormed nor dusted. I've never had any birds look like this before and so am clueless. Any advice, suggestions or ideas? What does it look like to you?