I have a few sick birds. They have respiratory symptoms that started this week. Sneezing, swelling eye, congestion. I went to my local farm store and purchased tylan 50. What is the dosage for this? I was going to use tetroxy which is oxytetracycline I got from a vet a few months back for my quail. I have read various posts that tylan is the way to go when dealing with this. I understand this has and will spread to my other birds and some will show sick and some won't. I also understand they will be carriers for life. I have a closed flock and if I get new birds it's ones that hatch out within the flock. I have birds of all sizes beginning with silkie all the way to a Plymouth Rock. What dosage would I give to my birds? Currently 4 out of 14 are showing symptoms and I'd like to try to get this under control. I plan to clean and disinfect my coop tomorrow and change bedding.