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See my post above, here. https://www.backyardchickens.com/threads/using-all-of-your-chickens-feather-meal.783463/post-24634686 Its chemistry. You need controlled, high temperature, steam. Chances are near 100% you don't have the equipment to do it at home, and the cost of such equipment...

I'm not sure where they went wrong in their internet search, or how detailed the instructions they are seeking, but within the first 8 hits in my search, I ran across a paper discussing the technique. Feathers are steamed under pressure (temperature determining the final product to some extent...