
Double-dosing sheep is not the way to manage drench resistance.

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Scary fact: double-dose dilemma
When it comes to levamisole-resistant worms, you would need to give a dose big enough to kill the sheep, before it would kill the resistant worms. Double-dosing sheep is not the way to manage drench resistance.
The quick quiz
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State Outlooks for August 2016
Predictions for a good spring also mean increased potential for worm and fly parasites to stymie production. For instance, while animals can look good and put on weight, a non-clinical worm burden without the obvious signs of infestation such as dramatic scours, weakness or deaths of sheep, can reduce weaner growth rates by 30%, making the cost of worm testing small by comparison.
>> See report links below.