Thank you for sharing and clearing up the whole sprig vs spur for me, I was pretty sure it was hereditary so that’s why I haven’t tried breeding them yet. Sadly it means I don’t have anything to work withI guess I’ve got to find more eggs to hatch or chicks to buy.... any suggestions??The back of the comb is a sprig not a spur. It’s a genetic defect and hereditary. Most consider it a cull from the breeding program. I learned about them today, and thought I’d share with the group! Sorry for the bad news.