[thegranger]

Hi.  I have a small flock of 5 hens.  One of the hens has bad feather loss round her neck and chest.  I had originally thought she was moulting, but it's been a couple of months now and no sign of improvement.  The other four birds are fine, which makes me doubt if it is lice / mites. 

Any thoughts? 

[Part time dabbler]

Could it be this one is being bullied?

[landroverroy]

Is she reaching through wire to get at something on the other side, and so wearing the feathers away?

[mebnandtrn]

Sorry to hijack the original post, but same question but on their back? Looks completely plucked and has done so for months now. Otherwise healthy looking. Thanks

[nimbusllama]

Could it be this?
https://poultrykeeper.com/external-problems/depluming-mites/

[Marches Farmer]

It generally takes the feathers the same amount of time to grow back as it did for them to drop out over the moult, so a long moult means they look like a mangled feather duster for ages.  Bullying will often be one bird pecking at one particular spot - feathers around the vent are often a favourite but back and neck can come close.  A vigorous cockerel can also make them bare on the back and neck, particularly if he favours one hen above the others.  Depluming mite is quite unusual.