*Pour-on fly control preparations, such as high cis cypermethrin or deltamethrin, must be applied before the anticipated headfly season and especially to horned sheep. Such treatments should be repeated every 3–4 weeks during the fly season or as directed by the data sheet instructions. | *Pour-on fly control preparations, such as high cis cypermethrin or deltamethrin, must be applied before the anticipated headfly season and especially to horned sheep. Such treatments should be repeated every 3–4 weeks during the fly season or as directed by the data sheet instructions. |