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Beyond the Bale : December 2015
ON FARM 33 5. Choose a drench with an appropriate meat withholding period (WHP) and export slaughter interval (ESI) according to the time left before the sheep may go to slaughter. *When rotating drenches the current drench would ideally exclude any groups that were used the previous time. However, in practice, ensure the current drench has at least one effective active from a drench group that was not used the previous time. The ‘Drenches’ section on WormBoss allows you to search for drenches and find practical information about each drench. USING DRENCHES Good drenching practices are also a key factor in slowing development of drench resistance. Each time sheep are drenched, resistant worms survive and increase in amount and proportion on your property. The following five principles for drench use can limit how many resistant worms survive. 1. Avoid unnecessary drenching, especially: • adults • during droughts or prolonged dry periods • immediately before or after moving sheep onto very clean, low worm-risk paddocks (such as ungrazed cereal stubbles or paddocks that have been sheep-free for extended periods). See points 5.i and 5.ii below for further discussion on this. 2. Calibrate drench guns to ensure the correct dose is delivered. 3. Calculate the dose based on the heaviest animals in the mob. Split mobs for drenching if there is a large weight range, so sheep are not under-dosed. 4. Follow the label instructions to ensure correct dose and use of treatments. 5. If sheep must be drenched onto low worm- risk paddocks, such as lambing, weaning or winter weaner paddocks, do both of the following: i. When the sheep eventually leave these low worm-risk paddocks, treat them with an effective drench that has at least one effective active from a drench group that was not used when the sheep first went onto the paddock. The aim is to remove any drench-resistant worms surviving in the sheep after the first drench. ii. Ensure that the next time the paddock is grazed it is with a different mob of sheep. This second mob should have a moderate worm burden and their last treatment must be different from the treatment used on the first mob that grazed the low worm-risk paddock. This will dilute drench-resistant worms already on the paddock with more susceptible worms that the second mob is carrying. Note that grazing with cattle will not dilute the proportion of drench-resistant worms, but will decrease the total number of worm larvae on this paddock. QUARANTINE DRENCHING Finally, when new sheep are being brought on to the property, you should assume they are carrying drench-resistant worms. Avoid adding someone else’s problems to your own – quarantine drench the sheep as soon as they arrive. 1. ‘Quarantine’ drench all sheep (including rams) new to the property. • Use a combination of no less than 4 unrelated drench actives with at least one of these being the newest drench actives: monepantel (Zolvix®) or derquantel (with abamectin – Startect®) because the worms are least likely to be resistant to these. This can be done using multi-active (combination) and/ or single-active products at the same treatment – up the race with one product, then up the race again with the next. • Do not mix different drenches unless the label states you can, as different products may be incompatible. 2. Quarantine the sheep after treatment. • Hold the sheep in quarantine in yards (small mobs) or a secure paddock (larger mobs) for at least 3 days to allow worm eggs present at the time of drenching to pass out of the gut. • Provide adequate feed and water. • Afterwards, keep this paddock free of sheep, goats or alpacas for at least 3 months in summer or 6 months in cooler months. 3. After quarantine, release the sheep onto a paddock that is likely to be contaminated with worm larvae due to grazing by other sheep. This will ‘dilute’ (lower the proportion of ) resistant worms surviving treatment with worm larvae already on your property. 4. WormTest the imported sheep 10-14 days after drenching for added confidence that treatment was successful. 5. Get expert advice on up-to-date recommendations for quarantine treatments. These will evolve as the drench resistance picture changes. MORE INFORMATION www.wormboss.com.au www.facebook.com/paraboss.com.au Choosing drenches wisely is an important part of a sustainable and effective worm control program. PHOTO: Deb Maxwell WormBoss is an online tool at www.wormboss.com.au developed by AWI, MLA and the Sheep CRC to help producers optimise the timing and effectiveness of drenching and other worm management practices. The aim of the website is to reduce drenching and minimise the onset of drench resistance while increasing animal productivity, profitability and welfare. WormBoss is one of the three online products, along with LiceBoss and FlyBoss, that are consolidated (with AWI and MLA funding) into the one co-ordinated ParaBoss program. Subscribe to the monthly ParaBoss News e-bulletin at www.paraboss.com.au. Written by regional experts, it includes monthly state and regional outlooks on worms, lice and flies, as well as feature articles.
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