The dosage for tylosin (Tylan) for birds according to Merck is as follows:
Tylan50's 1 ml has 50 mg with a dosage of 35mg per 1 kg caged bird weight, according to Merck. 1kg=2 lbs
35 mg = 2 lbs bird dosage; 50 mg is 143% of 35mg, so 1 ml treats a 2.86 pound bird. 1 cc = 1 ml so 1/2 cc treats a 1.43 pound bird, 1 cc treats a nearly 3 pound bird, etc.
Depending on the weight of the bird, for three days, I'd treat as above. The injection is in the breast muscle. Unfortunately this medicine burns, so move the shot each time to a new spot in the muscle.