I don't have any roosters so it's not caused from that. I am leaning towards mites. I notice some of my other hens starting to get thin feathers in the same area. Also I gave the bald hen a coating of blu-cote, and the next day I noticed her beak and comb were a all blue, leading me to believe she is picking her own feathers. Sprinkled some seven dust under their roost, and I am going to try and give each bird a dusting of seven within the next few days. Hopefully this will help!
I don't think it has anything to do with roosters VS hens, any of them could get mites or lice. Have you seen any bugs? They can be tricky to spot, but if you look around the vent area or under wings, you might be able to see what they look like.
I would dust them under the wings and around the vent once a week for three weeks, this seems to be the prescribed method whether it's lice or mites and it totally worked for my roo.
I cleaned the coop thoroughly and dusted with the powder then put clean pine shavings in every week too. Cleaning out all feathers that dropped was key in getting rid of them as well if they're lice because they lay their eggs on the feather shaft. Good luck with it, the darn things are nasty!
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