Brute Pour On 5 LtY Tex Brute Pour On For Cattle is a ready to use formulation containing Permethrin, a synthetic pyrethroid highly effective against Buffalo flies and cattle lice. Y Tex Brute Pour On for cattle can be effective against pyrethroid susceptible Buffalo fly for up to 4 weeks and is also effective against biting lice and two species of sucking lice. Active Ingredient: Permethrin 87g L