Ok that isn't isolation. Isolation is by themselves. The reason it's needed for the one bullying is this: Being separated from the other hens will reset that hen in the pecking order after about a week. It will then start at the bottom of the pecking order and not be able to bully anyone around for at least a while, if ever again. You might try doing what you're doing, only take one out for a day or two until you can isolate the real Bully. THEN put her bottom apart from the others. She can be in a cage like that just not ever able to mingle with them.
Edit: Sorry, I should have explained that the first time but I was being brief. Too brief.
Edit: Sorry, I should have explained that the first time but I was being brief. Too brief.
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