Elderly rooster with recurring fluid in his lungs?

[RoosterHuggerLiz]

Exactly is the title says I have an older rooster named creepy who, when I first got him, had fluid in his lungs, I nursed him back to health and overall he's doing fine it's just that since I rescued him (About a year or two ago) he's had recurring respiratory issues. He's overall happy and healthy, I just want to see if there's anything I can do to help him with his lungs. I've treated him with antibiotics and I've brought him to the vet, they have no idea what's going on and we don't want to risk any surgeries because of his age. It doesn't seem to affect him much and he still cock-a-doodle-doos every morning, raspy as it is

 

[Wyorp Rock]

What antibiotic do you normally use for him?

It would be nice to know what the ailment/cause is. Does he get better with antibiotics, then relapses?

If the cause is MG, then you can put him on a monthly treatment regimen of Tiamulin (Denagard) which is used to treat MG. You'd give for 3 days each month to help relieve symptoms.

Alternatively, you could try Oxine.
I've never used it but have seen folks report good results. I'm not sure if @azygous has used it or not.
Here's an informative article on using Oxine
https://www.shagbarkbantams.com/the-many-uses-of-oxine-ah-animal-health/

 

[Eggcessive]

Do you have a picture of him? Does he gasp, sneeze, cough, or have labored breathing? Is he losing weight or thin? Are there any bubbles in either eye, nasal drainage, or swelling of the eyelid? Some respiratory disease can be caused by a mold fungus. Have you wormed him in case his respiratory problem is due to worms?

 

[azygous]

Oxine is a great treatment for breathing problems, no matter the cause. Used in a mister or vaporizer directed over the chicken so the mist is breathed in, it can kill bacteria and mold spores. The mixing ratio is 6.5 ounces of non-activated Oxine to one gallon of water. You can get it from Amazon. https://www.amazon.com/Bio-Cide-International-005AS01-1-Oxine-Ah/dp/B00TCLK576/ref=sr_1_3?crid=3EFMQAMT99BFL&keywords=oxine+gallon&qid=1668172863&sprefix=oxine+,aps,191&sr=8-3