Schering - Contains 5% permethrin and 5% piperonyl butoxide for optimum pest control. Piperonyl butoxide improves the effectiveness of pyrethroids for a broad range of insects and decreases the amount of permethrin needed to achieve a desired killing effect. 1 quart will treat 64-500 lb. animals; 1 gallon will treat 256-500 lb. animals. CATTLE: 3 ml per 100 lbs. up to a maximum of 30 ml per animal. SHEEP: 1 1/2 ml per 50 lbs. up to maximum of 18 ml. No withdrawal.