The dose for Tylan is 10 - 40 mg/kg, which is huge range.
If you have a 4 pound hen, that would be 1.8 kg.
1.8 pounds x 40 mg = 72 mg per day.
72 mg / 50 mg = 1.4 cc or .7 cc twice a day
I dosed my 5 pound rooster at 15 mg per pound (approximately 30 mg/kg). He got .8 cc twice a day, which is 1.6 ml total for the day. If you are injecting it, .8cc is a lot to give IM at one time to a chicken. I have since switched over to Tylan 200 since it is more concentrated.
The Tylan website says chickens should get 110mg per kg, and the source you're quoting says 10-40mg/kg, but it also say to give it several times a day, right?
Edited by casportpony - 6/12/15 at 5:23pm