Should I rotate the brand of dewormer I use on a regular basis?
Rotating the brand of the dewormer you use is not nearly as important as rotating the active ingredient of the dewormer you use. Parasites that are continually exposed to the same active ingredient may actually become resistant, making that particular type of dewormer ineffective for your horse(s). Horsedewormers.ca recommends rotating the active ingredient of the dewormer you use at least once annually, or as recommended by your veterinarian, as this will expose the parasites to a different chemical group with a different mode of action.
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