I have a mixed laying flock that had two one-year old Barnevelder hens. A few months ago I found one of the Barnevelders on the floor of the coop with her legs paralyzed. I put her on oxytetracyclene and encouraged her to eat and drink, but after a few days she gave up trying and died. I learned that Mareks can cause this, but not one of my other chickens has been ill. Today I just found my second Barnevelder on the floor of the coop with her legs paralyzed, just like the first. This would seem to indicate there is a genetic problem with these birds. They were acquired together and probably from the same hatching, so hopefully this isn't a general problem with the breed but rather I got a bad genetic strain. Anyone have any similar experiences with this breed? I really like the Barnevelders, but certainly don't want to go through this again.