It was just something I had read. Something to think about. That birds have the urge to scratch at the ground and forage whether full or not. Since pellets fill them faster it can lead to non agressive feather pecking.
I’ve never had this problem with any of my hens, thus far. But I do have two roosters and started out with an EE roo who likes to push the hens around. I know one of my roosters would do the plucking at the ends of the feathers. Just to damage them not pull them out. So I looked up why he would be doing it. That showed up as a why. I had heard of the bordom and lack of protein before but not this.