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Answers and links to further information are provided below the image.
1. When you next drench, how can your check how effective the drench has been?
2. What are the signs that indicate that blowflies on your property are becoming resistant to the flystrike preventative chemicals you use?
3. If your sheep are now starting to rub, bite or scratch at their wool, what are the chances it is lice, what might the other causes be?
4. What is the fungus that can kill worm larvae in goat dung and how does it work?
A DrenchCheck provides a simple, fast and low cost indication of possible drench resistance. It is the use of two WormTests—one used before and one after a drench—to see how the drench reduces the worm egg count.
The first WormTest within the DrenchCheck is done up to 10 days before a mob is drenched with a short-acting drench and the second is done exactly 14 days after the mob is drenched (testing earlier or later than 14 days can be inaccurate). The second WormTest should be based on individual samples and not the bulk collection method.
Sheep or goats do not need to be yarded for either of the dung sample collections; dung is collected in the paddock as for a WormTest.
These signs indicate you might have resistance:
The LiceBoss Rubbing Tool can calculate the likelihood of some of the following causes of rubbing and help you decide the most likely cause:
Australian strains of the nematode-destroying fungus, Duddingtonia flagrans, were first discovered in a CSIRO survey of grazing properties during the early 1990s. When fed to livestock, the fungal spores pass through the gut of the animal and are excreted with the worm eggs in the dung. The fungal spores then germinate and grow networks of traps that ensnare and kill the worm larvae soon after they emerge from the eggs. The adult worms living in the animals do not live forever, so this cycle of constant re-infection is required to maintain the worm infestation in the sheep.
Even though the fungus is fed to livestock, the product does not kill the worms inside the stock, it targets the larvae as they emerge from eggs in the dung. Feeding the product to livestock is the means to get the fungus into the faeces.