过去,曾在蝇类高发季节使用杀虫剂或驱避剂对畜群进行全面喷涂。但药物在接触皮毛后药性很快减退,需经常涂刷才能奏效。使用合成除虫菊酯类药物可避免上述缺点。它是一种释放较慢、药性持久的驱避剂,驱蝇时所需剂量很少。用法是将其浸透在载体材料(一种性能优良的药纸)上,做成巴掌大小的药签“锚”在牛耳上,药物活性成分缓 In the past, herds have been fully sprayed with insecticides or repellents during the season of high flies. However, the drug soon after the contact dermatitis diminished, need to brush often to work. The use of pyrethroid drugs to avoid these shortcomings. It is a slow release, long-lasting drug repellent, the amount required to fly is very small. Usage is to soak it in the carrier material (a good performance of the drug paper), made of palm-size swab “anchor” in the bovine ear, the active ingredient of the slow medicine