Feathers missing on a Roo's back?

sweetpeace

In the Brooder
5 Years
Mar 31, 2014
12
0
22
Our chicks are about 8 weeks old and I'm not sure if this one is a roo, but s/he has a more pronounced comb than the other 4, so I assumed. S/he is also the first one to the door and will peck at anyone trying to get in.
But just a few days ago we moved them from the house to their outdoor coop and today when I went to hold him/her, I noticed that his back is all bare and rough.
No mites that I noticed. The cage was thoroughly cleaned before using.

What else could it be and what could I use on it?
(I included the pic with the comb showing comb so you could tell me what you think:hen or cockerel)
Thanks so much!


 
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