cockerel or mange?

[MysteryChicken]

if you PM me with an email address, i can send you the book chapter.

Yes, I've seen the chapter, but I've located the immune disease from a similar article, of which I'm having problems locating.

 

[MysteryChicken]

Wow! That looks exactly like what I'm seeing here! Thank you so much @MysteryChicken and thank you @NatJ ! I found the article -- it's actually a book chapter, and the autoimmune disease that causes the feather shredding is vitiligo. Super interesting! Reading more on this now.

Here's Vitiligo.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3353230/

 

[fat brown hen]

The shredded feathers are from a different autoimmune disease. I just can't locate the name if it for some reason.
Vitiligo causes depigmentation of the feathers, & skin of a chicken but not shredding.

is the other disease Hashimoto's thyroiditis?

 

[MysteryChicken]

is the other disease Hashimoto's thyroiditis?

I've looked that up, & that has to do with the thyroid.

 

[fat brown hen]

I've looked that up, & that has to do with the thyroid.

 

[MysteryChicken]

View attachment 3912620

I didn't find that, as I only looked up the name.
Thanks. It was that the whole time. Could've sworn it was a different name. It's been awhile.