(Y-Tex) Python Livestock Insecticide Dust is used to control horn flies, lice, ticks and keds and to aid in the control of face flies, stable flies and other nuisance flies. Approved for use on lactating and non-lactating dairy cattle, beef cattle, sheep, goats and horses. Contains Zeta-cypermethrin and piperonyl butoxide. Apply up to 2 oz. per animal. One 12.5 lb. dust bag cartridge will treat up to 30 head of mature cattle for up to 8 weeks.