I wasn't sure where to ask this question, so here we go. I'm confused by the term "roach back". The APA-SOP defines it as, "a deformed, humped back, a disqualification." Is this something you identify by running your hand over a bird's back or can you see it? Is this hump more center back or towards the hips/shoulders? At what age would you be able to identify it in a young bird for culling purposes? How common is it? Thanks!