You can use it topically but typically it's an oral dose.
There are injectable and transdermal (pour-on and ear tag) forms for cattle and pigs. I'm not aware of an oral formulation for food animals, even though that's pretty common for horses.
alt Hacker News
There are injectable and transdermal (pour-on and ear tag) forms for cattle and pigs. I'm not aware of an oral formulation for food animals, even though that's pretty common for horses.