Thank you so much for coming back and letting me know how things came out. It's good to know the pullets survived and are laying. I wasn't planning on breeding these birds anyway, but I really want the eggs.
Riboflavin deficiency makes sense to me based on the symptoms, but I can't figure out...
I'm having the exact same problem as the OP. Month old chicks who were fine before now have curled and bent toes. These 10 chicks hatched on Nov. 23-24. I just noticed the problem with their toes this evening. It's very upsetting. It looks like they're all effected to greater or lesser degrees...