this chicken now sounds like this. ONLY WORSE. loud constant honking like a newly crowing rooster. the rooster is also doing it now. what should I treat with?? I will isolate the hen tonight. not sure about the rooster yet. started coughing on Friday last and I treated water with oxytetracycline . I have 60 birds , vaccinated for Mareks and this bird is about 6 mo old.