You probably can, but if it's MG you are dealing with, you *should* have seen improvement with the Terramycin(oxytetracycline).
Tylan200 is going to be a small dose. For a 3lb chicken dose would be 0.17ml per pound of weight given orally 3 times a day for 5 days in a row. (based on 25mg/kg 3X day dosing)
Please post some photos of your hen. Have you added any new chickens to your flock recently? Do you notice a bad odor about her? Swollen eyes - is there pus? Has that been removed? If not, the pus will not go away unless removed.
I’ll get one of my kiddos to hold her in the morning so I can get some pictures.
-no new chickens, but we have had major weather fluctuations not normal for us. Extreme amounts of rain. Several flock members have had some sneezing and slight congestion. They just all seemed to kick it and move on.
-odor...mmm...almost an infection type odor, but her crop doesn’t seem to be an issue. Would that cause mucus to come from inside her mouth? She’s also filthy and I wasn’t sure if it could be that. When she first started presenting with some sneezing and runny nose, I used VetRX. She promptly dust bathed afterwards.
-I don’t actually see any discharge from her eyes, but they are swollen. Not as bad as they had been. I tried to massage them with coconut oil, but she wasn’t cooperative at all. It sounds like I need to be doing more?
-she does have mucus coming from her nose/mouth. I have swabbed her nares and cleared them multiple times. I don’t see any lesions on the inside of her mouth or throat, but I will check it again.
-she is very congested, but somewhat less so today. I’m having to force the tiny bit of food I can get down her, but she did drink on her own today quite a bit.
Side note: this particular girl has struggles. In her little over a year life she’s had wry neck and three unexplained bouts of vague illnesses. She is just not the hardiest bird. She is separated, in my house, and has heat to keep her cozy.