(Bayer) Permectrin Pour-on Insecticide controls lice, horn flies, face flies, keds, horseflies, stable flies, mosquitoes, blackflies, sheep keds and ticks. Can be applied on lactating dairy cattle, beef cattle, calves, and sheep. Low toxicity-can be applied on cattle of any age. 1 gallon-25 cows. 1/2 oz. per 100 lb.-maximum 5 oz.