So 1 ml of Tylan 50 per five pounds works out to be 22mg/kg. For those that are OCD about dosing you can use the formulas below
22mg/kg of Tylan 50 - Weight of bird in pounds, divide by 2.2, times 22, divide by 50.
2 pound hen: 2 ÷ 2.2 x 22 ÷ 50 = 0.4ml of Tylan 50 25 pound hen: 25 ÷ 2.2 x 22 ÷ 50 = 5 ml of Tylan 50 (too much volume, better choice is Tylan 200)
22 mg/kg of Tylan 200 - Weight of bird in pounds, divide by 2.2, times 22, divide by 200
2 pound hen: 2 ÷ 2.2 x 22 ÷ 200 = 0.1ml of Tylan 50 25 pound hen: 25 ÷ 2.2 x 22 ÷ 200 = 1.25 ml of Tylan 200 Seems that if one is going to use Tylan on birds that weigh 2 pounds or more that Tylan 200 might be the better choice? -Kathy I think the Tylan 200 is too strong for IM injections in chickens, since it is used mostly in cattle. I would usd it in a bigger turkey, but not in a chicken. I believe your Plumb's book lists the dosage as 10 mg per Kg or 2.2 lb up to twice a day. Many people use it 1/4 ml for bantams, 1/2 ml for under 5 lb and 1 ml for over 5 lb once a day, but twice a day is probably okay too. Edited to add: If I ever decide to buy Tylan again I think I will get Tylan 200.