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Beyond the Bale : June 2017
PARABOSS: BEST PRACTICE ADVICE FOR MANAGING SHEEP PARASITES ParaBoss is a suite of three products – LiceBoss, WormBoss and FlyBoss – developed to help sheep producers in the management of lice, worms and blowflies. The LiceBoss, WormBoss and FlyBoss websites are sources of detailed management information and regional programs that will assist in managing the major parasite risks for sheep. The websites have been developed by expert panels of parasitologists and veterinarians from across Australia. ParaBoss provides access to the three websites at www.paraboss.com.au. Subscribe to ParaBoss News, the twice monthly free email newsletter with state outlooks on the current state of sheep parasites as well as feature articles and the quick quiz to test your knowledge of sheep parasites. You can subscribe on the ParaBoss website. Join us on Facebook at www.facebook. com/paraboss.com.au to see weekly posts on flystrike, lice and worm control. ParaBoss is funded by AWI and MLA and coordinated by the University of New England with industry oversight. MORE INFORMATION www.paraboss.com.au TREATMENT OPTIONS FOR LAMBS Unless lice are eradicated from ewes prior to lambing, there is a high risk that lice will transfer from ewes to lambs. Where possible, use the same method of treatment for ewes and lambs. Use of dipping products for ewes and backline products for lambs, or vice versa, may not eradicate lice because, for example, the protective effect of dipping may lapse before all lice on the backline-treated sheep have died. Products also vary in whether they can be used on unshorn lambs and on the age/size of the lambs: • One neonicotinoid insecticide can be used on unshorn lambs up to two months of age. • Some insect growth regulator (IGR) backline products can be used on lambs up to three months of age. • The macrocyclic lactone backliner should only be applied to shorn lambs and not be used on lambs less than 10 kg bodyweight. Dipping young lambs is usually inadvisable as smaller and weaker lambs can get knocked down in the yards or be caught under other sheep in the dip. If ewes are treated with an IGR product in later pregnancy, treat the lambs in the first three months of life. FIGURE 1: AN EXAMPLE OF THE QUESTIONS AND OUTPUT FROM THE LICEBOSS EWE- LAMB TREATMENTS TOOL. Lice management strategies on late pregnant or lambing ewes can be more complex than on dry sheep. MAKE THE DECISION EASIER WITH THE EWE- LAMB TREATMENTS TOOL The LiceBoss Ewe-Lamb Treatments Tool guides you through a series of questions to help you decide the best course of action to suit your particular circumstance. These relate to the time until lambing and the time since or when the ewes will be shorn and whether and when lambs can be shorn or treated. Figure 1 below shows an example of some of the questions the tool asks and a recommendation. Above all, check ewes for lice well in advance of shearing and lambing so that your treatment options are not restricted. The Ewe-Lamb Treatments Tool is available via www.liceboss.com.au/tools 43 ON FARM