I have read thru this entire thread, and it has fascinated me. A lot of good info. Here's my problem. I got 2 RIR's (6 mos old), and an EE (3 months old) at the same time, same place, different pens. The 2 RI's went after the EE relentlessly at first, but that became better over time, but occasionally the reds would grab a feather out of her tail and eat it. As this was only occasionally, I thought it might go away. But my EE has not had a tail for awhile now. That in itself was OK as they seemed just to take the tail feathers, the rest of her is nice and fluffy, normal pecking order and all that. BUT, the EE JUST started laying (2 eggs so far), and now the reds seem to be after her constantly. They are now starting up her back. I observed today the EE hunched down in submissive breeding stance, and the reds just picking away. I was building them a new coop and all I had was the 2X2 in my hand so I went over and smacked the side of the coop. They stopped for a bit, but at least once every minute or two I'd hear poor Goldie's "SQUAWK!!". It was really upsetting me. I threw them some meal worms thinking it might be a protein issue, and the other day when I refreshed their grit dish they ate all of it which surprised me as it was not empty before. I would get rid of the two who do the plucking, but they are good producers so far (they are still laying pullet eggs), and Goldie has just started. If it doesn't cease, I may re-home Goldie, and get another hen, but I tried adding a barred rock, and that was a disaster. Putting her in at night (tried 3 nights) didn't work AT ALL, and after 4 days of them relentlessly chasing her and so much "crying" from the reds, I re-homed her. I'd love a BO but am afraid it could not stand up to the abuse by the reds.
Anyway, I may try the Forco, our local feed store may carry it. I have a drop feeder in the coop, and a chicken nipple waterer (don't think the bits could be used with the nipple waterers). I will also get some Blue Lotion to put on Goldie (I was hoping for blue eggs, got very light olive. Maybe the Blue Lotion will change that!
) I have also tried BOSS (my horse LOVES it) and they seem uninterested. Ditto apples. I feed kitchen scraps (prime rib scraps seem to be a favorite, but I wanna know, HOW do THEY know it's so good? Chicken races in the extreme). I'm durned sure they didn't get anything like that where I got them from. Also feed fruits and veggies. They get out on the grass a couple times a week. When I mow the coop gets raked up and they get the clippings which they LOVE. Most evenings if they don't get out I pull weeds (crab grass mostly) out of the back yard. Only problem with that is now the back yard is practically weed free, guess I better go weed the neighbors yard.
Thanks for all your posts, and Azygous thank you for all your updates on all you have tried on your bad little lassie.
BTW, I used to raise finches, and the grit mixture I mixed for them included kosher salt, I might scatter a bit on the ground, see if they go after it.
Anyway, I may try the Forco, our local feed store may carry it. I have a drop feeder in the coop, and a chicken nipple waterer (don't think the bits could be used with the nipple waterers). I will also get some Blue Lotion to put on Goldie (I was hoping for blue eggs, got very light olive. Maybe the Blue Lotion will change that!

Thanks for all your posts, and Azygous thank you for all your updates on all you have tried on your bad little lassie.
BTW, I used to raise finches, and the grit mixture I mixed for them included kosher salt, I might scatter a bit on the ground, see if they go after it.