A cross sectional study was conducted to determine the prevalence of ectoparasites of sheep in ectoparasites controlled and uncontrolled areas, assess major risk factors and evaluate effects of ectoparasites on livelihood of farmer in ectoparasites controlled and uncontrolled areas of Arsi zone. A total of 969 sheep (646 sheep from controlled and 323 sheep from uncontrolled areas) were examined for ectoparasites. From controlled 371 (57.43%) and from uncontrolled area 285 (88.24%) were found to be infested with ectoparasites. The ectoparasites identified in controlled area were B. ovis 48.9%, Linognathus spp 0.93%, sheep keds 7.4%, 2.32% B. decoloratus, 1.46% A. variegatum, 1.08% A. gemma, 4.59% R. evertsi evertsi, and 0.31% mixed ticks infestation and 12.5% mixed infestation with various ectoparasites. Similarly from uncontrolled area identified B. ovis 81.4%, Linognathus spp 0.9%, 1.79% B. decoloratus, 2.62% A. variegatum, 9.29% R. evertsi evertsi, 4.3% mixed ticks infestation and 32.2% mixed infestation.
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