Dursban--its efficiency against the sheep tick.
D000818:Animals; D007306:Insecticides / Q000627:therapeutic use*; D010756:Phosphoric Acids / Q000627:therapeutic use*; D011725:Pyridines / Q000627:therapeutic use; D012756:Sheep; D012757:Sheep Diseases / Q000188:drug therapy*; D013984:Tick Infestations / Q000188:drug therapy / Q000662:veterinary*
D007306:Insecticides; D010756:Phosphoric Acids; D011725:Pyridines