Molting or mites?

[dkcuillo]

Hi everyone! I was hoping I could get some help with one of my Hens. I have 5 currently and a rooster. One of them over the past few weeks has been loosing more and more feathers. It's definitely not the rooster picking on her. He is the only other one in the flock who is missing some feathers as well. She has stopped laying for the most part. The feather loss started on the neck and then went to the back.

 

[Eggcessive]

How old are they? The yearly molt occurs first about 16-18 months of age, and they will usually stop laying and the comb may shrink and turn pale. Usually during a molt you will see loose feathers inside the coop and outside where they spend time. Not all of the chickens the same age will molt at exactly the same time, but may vary over several weeks. If feather-picking is suspected, you probably won't see feathers.