My Daughter is pretty much just starting into the breeding part of this. All her stock has come from people that show and none of her breeder birds are related. With her black silkies, every once in a while she will get one that the legs will sprawl out on, not sure how to explain it, but the bird can't walk or put their legs together. She's had one buff do it but it's mostly with her blacks and blues. Is this a genetic problem or a vitamin/diet problem, it's been mostly with the silkies, she had one hamburg do it last year? She feeds mostly layena crumbles as the main grain. These are not young chicks these are half grown birds, always within the first year usually around 6-7 months old.