Ehhh... If they are unable to move from the neck down or are experiencing paralysis I think you may be dealing with something else entirely. Could it be Marek's disease? Symptoms for Marek's according to my Chicken Health handbook include: enlarged feather follicles or white bumps (tumors) on skin that scab over with a brown crust. (Skin form of Marek's); stilted gait or lack of coordination, pale skin, wing or leg paralysis. When both legs are paralyzed, one points forward, and one points backwards. Rapid weight loss, gaping, or gasping, transient paralysis lasting 1 to 2 days, dehydration, emaciation, coma, death. Does any of this sound like your birds?