Now homing pigeons are raised either to fight this bug or to clean the respiratory tract. Can I raise it naturally without medication? How to raise it?

Yes, I seldom give medicine to pigeons. The medicine is toxic in three ways, but I usually keep the pigeon house clean twice a day and disinfect it regularly. I prepare two water dispensers to be replaced every day, and the other one is put in a dry and ventilated place for later use. Don't give pigeons moldy and spoiled food. What is not absolute? Don't abuse pesticides in spring and autumn, isolate sick pigeons and don't use electrolyte.