feather loss

[EpiphanyChicks]

i live in massachusetts, so it's been pretty cold.
i have 8 ee hens, that seem to be healthy and happy,
we get an average of 6 eggs per day,
they are in a house we sized for 16 hens,
and they eat like crazy: layer crumbles, greens and corn.

yesterday one hen had a bald spot on her back
today several more do!
I don't see any mites,
and they're still eating and laying.

we put corn and greens around outside to encourge
them to come out and scratch around so they don't get bored

anyone have any ideas? they were hatched & gotten from Ideal last july...

thanks in advance, i'm a little freaked out!

 

[katrinag]

They could be having a mini molt.

 

[ChickyBabe]

I know this will sound a little odd but do they have access to walnuts? We have a black walnut tree by our coop and my chickys ate them and started losing their feathers