I would take the main hen out for a bit, its worked for me. Give her a time out, lol
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It does last longer, I tried the pick no more and it didn't work here when my hens were pecking my roos wattles[why I have no idea] but using it around the face you have to use a qtip or cotton to make sure it doesn't get into their eyes.I've got some stuff called "Pick No More" which also turns him purple. It's a very sticky ointment. I put that on him and they left him alone for a while until it wore off. Is the Blue Kote better? Does it last longer?
Well that answers that. I doubt it could be the diet. How strange that they just want to pick on him all of a sudden.