I have to add a PVC roost pole and find some material for covering 12 of the top of the pen. The pens I built are 40 square x 48 tall made with 2x4 base and 2x4 welded wire. I have owned reg chickens and 1 game rooster before and he recently passed. Thoughts Thanks I would add that hes got more station and gonna make a little bigger bird than his older brothers. Research only pulls up that its a basis for culling, which I understand, but not much on the source of the problem. Hes healthy and otherwise fine, and I have no problems culling him, just interested to know yalls experience in how or why this happens. I caught him tonight and about 3-4 vertebrae (about an inch up) from where his neck comes out from between his shoulders I can feel where his neck takes an unnatural turn to the right.