Hi Brahmamama2010,
I'm sure you're doing everything right. These things just happen sometimes (for instance some birds have extra requirements for nutrients; or sometimes feed may be slightly older when purchased). Really there are just millions of ways feed can be a little low in nutrients...
Hi brahmamama2010,
I think this can happen when chicks hatch with slipped tendon or perosis. The hocks develop sores and infection very soon from being in such a moist environment (incubator) or from rough ground/wire floor.
I've never had luck treating slipped tendon, I'm sorry to say...