Kennedy M J
Alberta Agriculture, Animal Health Laboratories Branch, Edmonton, Canada.
J Parasitol. 1994 Apr;80(2):321-6.
Trihedron sticky traps were used to monitor the prevalence and intensity of Thelazia spp. in face flies associated with 2 groups of cattle. Traps were set for 24 hr once a week beginning 2 wk before cattle were turned out to pasture following winter housing and continued until flies reached diapause in October. The 50 heifers in group 1 received 1 treatment with ivermectin (Ivomec Pour-On for cattle, 500 micrograms/kg body weight) on the day of turnout onto pasture. The 50 cows and their calves in group 2 were not treated. Treating cattle with ivermectin delayed the onset of infection in Musca autumnalis by 20 days and reduced the prevalence to 2.2% compared to 26.9% in flies from the control pasture. Although residues of ivermectin eradicate many fly larvae developing in cattle feces, there was no significant difference in the number of flies counted on the faces of cattle or in the number of flies caught on sticky traps on the 2 pastures (P > 0.05).
三棱锥粘性诱捕器用于监测与两组牛相关的面蝇中吸吮线虫属的流行情况和感染强度。从冬季圈养后牛群放归牧场前2周开始，每周设置诱捕器一次，持续24小时，直至10月苍蝇进入滞育期。第1组的50头小母牛在放归牧场当天接受了一次伊维菌素治疗（用于牛的伊维菌素浇泼剂，500微克/千克体重）。第2组的50头母牛及其犊牛未接受治疗。用伊维菌素治疗牛可使秋家蝇的感染开始时间推迟20天，并使感染率降至2.2%，而对照牧场的苍蝇感染率为26.9%。尽管伊维菌素的残留可根除许多在牛粪中发育的蝇幼虫，但在两个牧场上，牛面部计数的苍蝇数量或粘性诱捕器捕获的苍蝇数量没有显著差异（P>0.05）。
