danceswithronin
Crowing
Well thank you.
This may be gross sounding, but if you could look at an unaffected, unsick bird (necropsy a healthy bird), it would give you great beginning knowledge knowing what is normal.
I am considering butchering cockerels in a future batch of chicks rather than selling them just to simplify things and ease into keeping chickens for meat as well as eggs, so if I do I'll definitely do a necropsy on at least one.