I see what appears to be a pronounced inward curve on the pelvic bone. I think I have that as well and will be checking for it when I examine the young ones in a few weeks. Is this characteristic of rocks in general? This characteristic, supposedly, works against egg production. How does it come about and can you get rid of it and still maintain good meat qualities. My guess is that it comes with the territory and you can't breed it out without accepting a lighter bodied bird?