Both my friend and I started raising coturnix this spring. I started out small and we both sourced eggs from different places. He gave me a pen of 7 birds and all of his have curled feathers down their backs. A couple of the hens are over-bred and missing back feathers, but even the male is curly-feathered. Conversely, I did not experience that in any of my birds....I just wondered what might have caused the feathers to curl. Is it a deficiency or something that I can easily correct? Is it something to be concerned about in regard to breeding them....disease, illness, etc?