For the over the last year my Orpington hens have had this respiratory issue. They sound like they have a head cold. Their clucks sound coarse and wet. They shake their head, scratch their nose and mouth breathe. No foamy eyes. I have taken them to the vet twice. He has given them antibiotic injections and some I gave them at home and anti inflammatory medication. He gave them a shot for worms about 2-3 months ago. It cost me loads of money, and I just can't afford it anymore. He did not do any tests to diagnose exactly what the problem was. They act like they feel fine they eat well and they're active. Over the last six months I have given them Baytrol and Tylan Also Denaguard in their water for 10 days. The symptoms wax and wane. I just don't want to keep giving them antibiotics because it doesn't seem to make any difference one way or the other. I clean the coop every day, change their water every day and put a tbs of vinegar in it. They have plenty of shade and free range. Can anyone think of anything else I could do?