Australia's resource for control of worms, flies and lice in sheep, and worms in goats
Double-dosing sheep is not the way to manage drench resistance.
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.
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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.
Typically, worm egg counts are in the low to moderate range in the majority of cases, but high burdens of black scour and also barber’s pole worm are being detected. August, being an ‘A’ month like April, means that it is time to drench for liver fluke on some at-risk properties.