Hello, I have a New Hampshire Red rooster born in Feb 2013. He has been healthy and active with no problems since I got him. A few weeks ago I noticed a few of my hens missing feathers on their backs and I thought perhaps it was mites or lice so I bathed with flea shampoo and dusted them all with Sevin dust the next week. Neither time did I see any insects or evidence of infestation. A few days later I realized my inexperienced Partridge Cochin rooster was the reason my hens were missing feathers. Okay, back to my rooster - when I was doing all the bathing and dusting I noticed that my NH rooster has this red raw area around his rear. I washed his rear and applied Vaseline on it. It is still the same. His feathers are starting to fall out now. I don't know what to do for him and I don't know what is causing it. He does not seem to be sick in any other way. He actively mates with the girls. I read something about possibly his diet being too acidic. I feed Dumor feed from TSC and I know lots of people hate that but my hens seem to eat it okay. I also supplement their feed with fresh greens and fruit every day so I am wondering if he might be allergic to something I have fed him. I am so confused. None of my other hens seem sick, none of the others have red butts. Does anyone have any experience with this? Does anyone have suggestions? Thank you.