Hens with terrible bareback, is it Disease? Severe Overmating?

[Kiki]

So my father owns a large amount of chickens, he is a rather old man so it has become my job to take care of these chickens, which is extremely hard to do as a full time college student who studies an hour away most days. A few of our wyandottes have been losing their back feathers over the past month, at first I thought it may be them moulting early (they are close to 10 months old, which I thought was rather strange for them to be moulting this early if that was the case.) so I decided to spray them with Vetericyn Plus Poultry Care in hopes that maybe it would help them, but this week upon arriving home, I've noticed how severe most of these hens have gotten, their backs are raw and red and look painful! I was extremly worried over them, so today I caught as many of them as I could and covered their raw back area with Rooster Booster Pick No More lotion, hoping it might stop other hens from pecking the area.
I also noticed today that some of our other hens of different breeds are starting to lose their back feathers as well, just not as fast as these girls did, could this be an issue caused by our rooster overbreeding? He walks up to the hens and pulls out some of their feathers when I'm up there, could this be his doing?
I'm begging for help on this issue, I've expanded their pen and bought vitamins and that I've put in their water in case it was a nutrition issue like some have suggested, but nothing had been helping and I'm trying my best with the little information I know to help these hens, so please any information would be helpful!

Below are the pictures of the worst hen in the bunch, this was before I put the lotion on her! I also added a picture of one of our other hen who is slowly losing her feathers as well!View attachment 1528049 View attachment 1528050 View attachment 1528055

Have you checked them for lice?

 

[Kiki]

Thank you for the comment! I will definitely give them a thorough checking first thing in the morning! We thought that might be an issue, I've dusted their pen and coop a few times in worry for lice and mite issues, but I will check them out!

Invest in some permethrin and make sure you treat everyone and all the cracks of the coop. The spray works well for getting into cracks.
IF you noticed signs of bug tomorrow.

Permethrin Concentrate, Martin's on Left - Durvet on right

• Kiki
• Jul 28, 2018
• 2

Screen Shot 2018-07-20 At 8.58.04 AM

• Kiki
• Aug 3, 2018

Martin's PERMETHRIN spray

• Kiki
• Mar 22, 2018
• 6
• flies lice mites permethrin

 

[Isaiah53]

Invest in some permethrin and make sure you treat everyone and all the cracks of the coop. The spray works well for getting into cracks.
IF you noticed signs of bug tomorrow.

Permethrin Concentrate, Martin's on Left - Durvet on right

• Kiki
• Jul 28, 2018
• 2

Screen Shot 2018-07-20 At 8.58.04 AM

• Kiki
• Aug 3, 2018

Martin's PERMETHRIN spray

• Kiki
• Mar 22, 2018
• 6
• flies lice mites permethrin

You guys in the USA are so blessed to have access to this stuff! I drove across the border and purchased some permethrin powder. When I came back to the border in canada the border guard was not going to let me in with it as it's a "prohibited substance". Although I can purchase permethrin SPRAY! Drives me crazy.

 

[Kiki]

You guys in the USA are so blessed to have access to this stuff! I drove across the border and purchased some permethrin powder. When I came back to the border in canada the border guard was not going to let me in with it as it's a "prohibited substance". Although I can purchase permethrin SPRAY! Drives me crazy.

Silly boarder patrol!

 

[Isaiah53]

Silly boarder patrol!

I thought so too! LOL, but in the end he was very kind and agreeable. He just asked me to PROMISE never to try to bring it across again and let me keep it.

 

[Kiki]

I thought so too! LOL, but in the end he was very kind and agreeable. He just asked me to PROMISE never to try to bring it across again and let me keep it.