I have 5 adult chickens, one splash orphington, two blue orphingtons, and two golden comets that are gurgling and have like a sticky mucus on their beaks. They sound like they are drowning when they breath. Also seem to be holding beaks open alot when they are breathing. Two of them are setting right now. So far the rest of them don't seem to have it just yet. I have put antibiotics in their water but I don't know what else to do. I have called every vet in the tristate area and none seem to know anything at all about poultry and have no suggestions at all or any idea what this might be. I have searched the internet but getting no good answers there either. Does anyone know what this might be and anything I can do to save them?