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Not sure if you ended up going with Tylan50, but if so you sound like you're on the right track. I use 35mg/kg every other day for 3 days to dose my birds, and it has worked every time. I just posted this elsewhere, but I'll toss it here as well:
Dosing Tylan50 at 35mg/kg:
If 2.2lbs = 1kg or 0.455kg = 1lb;
-- then a 5lb bird is 2.3kg.
-- -- at a rate of 35mg/kg = 80.5mg of Tylan50 is needed to treat.
-- -- -- if each ml of Tylan50 is 50mg, then 1.6cc (or 1 3/5ths cc) is needed for treatment.
Using these measurements;
-- a 1lb bantam would be 0.3cc
-- a 2lb bantam would be 0.6cc
-- a 4lb standard would be 1.3cc
-- a 5lb standard would be 1.6cc
-- a 10lb young turkey would be 3.2cc
-- a 15lb turkey would be 4.8cc
-- a 20lb turkey would be 6.4cc
-- a 25lb turkey would be 8.0cc
This is only good for Tylan50. If you are dosing using Tylan200, please remember that it is 4 times as concentrated as the former. I hope this helps.
Edited to Add: When your dosages start getting too large to consider injecting one application, you will want to split the dosage to 2x or 3x daily. For example, I would not dose out a 15lb turkey with a 4.8cc injection all at once. I would dose the bird at 2.4cc 2x that day. Once in the morning, once in the evening. Then skip a day - and do it again.
I hope that helps.