BI - Contains 7.4% Permethrin and 7.4% Piperonyl Butoxide, in an oil-based, ready-to-use formula, to control lice, horn and face flies on lactating and non-lactating dairy cattle, beef cattle and calves. Also aids in the control of mosquitoes, stable, horse, house and black flies, sheep keds and lice. Apply as a pour-on, mist spray or back rubber. Apply 2 cc per 100 lb. body wt. with a maximum of 20 cc per animal. For back rubber use add 64 cc per 1 gal. of mineral oil. No milk withholding or slaughter withdrawal.