Great article, I hadn't seen it. Thanks!!
New feed=old feed: Both the same level of protein, calcium and major ingredients. And I was kinda thinking maybe an allergy to the new feed. There are 4 with bare bellies though, and one with what seems like just dry skin so it seems odd that 5 out of 13 would have a reaction. Both by the way are plant protein not animal. Can't find any feed with animal protein and the people at the store look at me like I have 5 heads when I asked for it.
As far as treats go, I have never given bread or what I think is empty calories and everything I do give is nutritious except for cracked corn but they don't get a ton of it. Just a big handful every other day. They do get BOSS, eggs, meat, fish, various greens, fruit, weeds and sprouts I sprout for them. (we laugh they eat healthier than we do

)
I think I will get blu coat at the feed store in a few days and try that.
I read another suggestion that maybe they were going to go broody so plucked the feathers and then snapped out of it? But I think you're right, I may just never know. I'm not going to put them through the Sevin ordeal again. I'm just going to watch and wait. Maybe add more animal protein and eggs, start giving them yogurt once a week and pepper/squash seeds for natural worming.
THANK you all for your help!!!!