Losing feathers

[Bknobel]

A lot of my chickens are losing their feathers around their necks eating and seem ok just losing feathers. Checked and no bites or bloody areas, just no feathers.
Help they look horrible.

 

[DobieLover]

A lot of my chickens are losing their feathers around their necks eating and seem ok just losing feathers. Checked and no bites or bloody areas, just no feathers.
Help they look horrible.

How old and what breed?
Can you post a few pictures?