The most concentrated and economical lice & fly control pour-on on the market today. It controls biting and sucking lice, horn flies and other pests. Its low-volume application rate reduces waste and animal stress. One 16 oz. bottle can treat up to 32 animals (1000 lb. or larger). Can be used on lactating and non-lactating dairy cattle and beef cattle with no withdrawal time required. It is non-systemic and can be used year round without the worries of reaction that sometimes occurs with cattle grub treatment. Provides horn fly control for up to 6 weeks after application.