Efficacy of ivermectin against cattle warbles was studied in an endemic area of Pakistan. A total of 229 cattle of three breeds and different ages were divided into two groups; treated and untreated control. Treated group was given ivermectin s/c at the rate of 200 µg/kg body weight during the 1st week of September. None of the treated animal developed warbles. Warbles were seen in 23,8% of untreated control animals. Statistically non-significant differences were seen amongst different breeds and age groups. The seasonality of warbles is discussed.
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