Quote: One teaspoon of that weighs about 3 grams and there are 55mg oxytetracyline per gram, so it's 3 grams x 55mg x 2 teaspoons = 330mg per two teaspoons. I think the instructions say to use between 200mg and 800mg per gallon. If you want to use the max dose, it's 5 teaspoons.
This is from a thread I started:
Package weighs 181.5 grams and has 10 grams oxytetracycline.
10 ÷ 181.5 = 0.055, which means it's 5.5% oxytetracycline, 94.5% filler
One gram = 55mg
One teaspoon weighs about 3 grams which = 165mg x 5 teaspoons = 825 mg
The 800 mg dose for one gallon = 5 teaspoons (825mg is close enough)
https://www.backyardchickens.com/t/1022878/oxytetracyline-and-tetracycline-powder-doses
-Kathy