A couple of months ago one of my cockerels developed a swollen eye after fighting with another cockerel, so we thought he had an injury. It lasted a few days and went away. Shortly after that we noticed what sounded like wheezing coming from him... Then more recently one of our other cockerels made a wheezing noise after he crowed. Coincidentally someone told me they were dealing with mycoplasma and the symptoms rang a bell... I put all of my chickens on oxytetracycline purchased at tractor supply for one week. I put 5 teaspoons in a gallon of water as per instructions I found on here in an older thread... Now my original cockerel still has the wheezing as does the other cockerel when he crows, and I haven't noticed any improvement. But they seem totally fine otherwise. It's been a while since the first cockerel developed the swollen eyes... He's totally ok otherwise but why didn't he improve with the antibiotics? Should I have put them on it for longer? Could it be another issue? Should we put him down? We don't have the heart to, but if there's no other solution we will humanely euthanize him. Thanks in advance.