http://tylanpowder.com/tylan-powder-for-chickens/
https://poultrykeeper.com/poultry-medication/tylan-used-to-treat-respiratory-problems/
this site says just one day after last treatment but it is referring to a low dose and in their water
i am still looking
https://poultrykeeper.com/poultry-medication/tylan-used-to-treat-respiratory-problems/
this site says just one day after last treatment but it is referring to a low dose and in their water
i am still looking