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Preventing Resistance
• Avoid bringing it onto your property with
imported goats
– Quarantine drench with a combination
• Reduce reliance on anthelmintics
– If drenching adult goat > 2-3/year then heading
for trouble
• Not a simple matter of how many drenches
– Not all drenches are equally potent at selecting
for resistance
• Don’t underdose
– Problem as to what is an effective dose for
• Annual rotation of anthelmintics
– Good idea but now no evidence that it works so
• Use of combination anthelmintics
– Theory is that the chance of surviving one
anthelmintic is small so the chance of surviving
two is very small.  Similar concept with