An effective and long lasting repellent for nuisance insects on horses, farm livestock and poultry. Louse Powder FAQ’s What animals can it be used on Cows, horses, donkeys, minis, alpacas, goats, sheep, pigs, poultry. Active ingredient P-Menthane - 3,8-diol 0.8%w/w Application Apply an even spread of powder over the affected area on the animal or the bedding. With-holding period No withholding period for meat or eggs. How does it work It is a repellent that deters rather than kills the insect. (Not an insecticide) How long does it last Will stay on the animal for up to 7 days if kept dry. Usage amount 5g to 10g covers an area 10cm X 15cm