My PBRs are nearly a year old, and I have several left to cull, as I have a new mixed flock growing in the brooder. However, one roo in particular has feather loss on his inner legs and his rear, below his longer tail feathers. The skin in these areas looks red and inflamed. A brief look in the few book resources I have did not reveal anything notable....if he is to be culled anyway, does he need to be healed first? Do I put him in isolation? Yes the roosters fight, but for the most part get a long. I have not been able to observe this particular bird for long periods of time to see if he is preening them out himself. I have another roo that has shaggy, whiter than normal PBR feathers on his chest, that look loose and ragged. However, where his feather density is lacking, the skin looks normal and yellow. What's the likely diagnosis?