You are missing my point. How can there be a dosage for Tylan 50 and Tylan 200 for birds when the company Elanco's Vet said there is NOT one? She told me not to use it off label. I don't think it was the "luck" thing cause she called me 3 times and was very nice on the phone and went through everything thoroughly with me. You book says 10-40mg/kg as the dose for BOTH, that is a large margin and I do not understand how it can be the same dose for tylan 50 and 200 when the 200 is 4 times stronger then the 50? How do you chose the dosage, do you use 10, 12, 15, 20 25, 30 ,35 or 40mg/kg? Then for a caged bird it says to use in combination with another drug, which you did not mention at all. The it says 30mg/kg q12h (what the heck is q12h?) Having these doses and not being able to properly read them is also an issue. I mean my goose weighs more then my peafowl so am I using the same dose on the goose as the peafowl? So I am going to ask my Vet to explain it to me.