Chucks pecking each other

[Shazz1]

Hi
I have 8 ladies and for the last 2years or so have been quite happy and laying well
a few months ago they lost most of there feathers from the back ends ( which I’m guessing is moulting?) but lately a couple of them have started pecking and drawing blood on some of the others
any help would be great
they have a large coop and the run is quite a good size 30ft x 17ft so I don’t think that is the problem?

 

[nuthatched]

What do you feed them? Sometimes pecking is caused by lack of protein.

 

[Shazz1]

What do you feed them? Sometimes pecking is caused by lack of protein.

There on layers pellets
then as a treat they get a mix of Maisie, corn, meal worms
i also hang apples and cabbage for them.

 

[aart]

a large coop

How big is the coop?
What does the run look like, pics would help here.
Might need to 'clutter' it up for some diversion.
https://www.backyardchickens.com/threads/a-cluttered-run.1323792/

There on layers pellets
then as a treat they get a mix of Maisie, corn, meal worms
i also hang apples and cabbage for them.

Cut out all but the layer feed for a week or two, see if that helps.
What is the protein percentage of the layer feed?