Hi, hoping I could get some advice. I have a young hen that has a respiratory issue of some sort. Treated with oxytetracycline for 4 days and no improvement. She's been on the injectable Tylan, but given by mouth for 6 days. She's improving but has a long way to go How much longer should I use the Tylan? How long after her symptoms are gone until I can add her back in with the flock?