Barrier Animal Health Livestock Louse PowderA natural insect repellent suitable for organic farming systems and direct application to livestock including horses, cattle, poultry, goats, rabbits and other small pets. (The powder won't stick on pigs and birds). Unlike most products that treat sucking and biting lice separately, this repellent works against both parasites in the same treatment. It contains slow release granules that can remain active for up to six weeks depending on weather