Barrier Livestock Louse Powder. Keep your livestock and animals parasite free with the Barrier Livestock Louse Powder. Designed with a unique formulation, the Livestock Louse Powder contains a safe-carrier perfect for applying directly to the animals whether it be farm animals, horses or small pets whilst causing no carcinogenic effects. With the use of natural plant based oils, Livestock Louse Powder is successful in removing both biting and sucking lice where there may be an infestation or alternatively it can be used as protection.