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the australian farmer It’s time to start strategic summer drenching
Find out why the first summer drench can be so important in protecting your flock’s health, plus what to look for in your summer drench of choice.
egg count monitoring after the first summer drench should be used to determine timing of subsequent drenches. WormBoss.com.au provides a number of recommendations for various regions regarding the timing of the first drench. 1
It’s that time of year in most areas of Australia to do the first strategic summer drench. A strategic drench is a ‘drench given at a critical time to reduce worm lar- val contamination of a pasture for the benefit of the whole mob or herd rather than just for the treated ani- mals, and/or a drench given to sheep, irrespective of worm egg count, at times when they are expected to be most susceptible to worm infection’ . 1 Why summer drench? The use of a first summer drench is still recom- mended best practice in the winter dominant and uniform rainfall regions of Australia. 1,2 The aim of summer drenching is to remove the worms in the sheep when the numbers of infective larvae on pasture are low or in decline (due to sum- mer weather conditions). This reduces the number of infective larvae on pasture the following winter, thereby reducing the production cost of worms and number of drenches needed over this time. The predominant worm species of these winter rainfall regions are the black scour worm ( Trichos- trongylus spp.) and the small brown stomach worm ( Teladorsagia spp.). These typically cause problems over the autumn and winter period when favourable conditions and susceptible livestock allow for a sig- nificant buildup of infective larvae on the pasture. When to summer drench? The timing of the first summer drench and the need for a second summer drench varies between regions based on what is most appropriate for worm control and drench resistance management. Routine worm
Which drench to use ? The summer drench of choice is one that:
• Has an efficacy as close to 100% as possible – any worms that survive this treatment will result in pasture contamination. A combination of highly effective actives, such as TRIGUARD®, is recom- mended best practice. 2,3 • Has a short duration of activity – that will apply less selection pressure for resistance at a time when there is less refugia on the pasture to dilute contamination from resistant adults. Persistent actives such as moxidectin are recognised for their potential to select more rapidly for resist- ance1, and this effect can be exacerbated during times when there is less refugia on pasture.
Summer drenching Start your summer drenching program now to minimise the level of larval pas- ture contamination responsible for winter worm burdens. TRIGUARD® is an ideal choice for summer drenching due to its combination of three actives and short duration of activity.
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