HOW TO USE THIS ONLINE MAGAZINE
by clicking the arrows at the side of the page.
by clicking anywhere on the page. A slider will appear, allowing you to adjust your zoom level.
and move the page around when zoomed in by dragging the page.
and return to the original size by clicking on the page again.
by entering text in the search field and click on "In This Issue" or "All Issues" to search the current issue or the archive of back issues
a PDF of this magazine.
by clicking on thumbnails to select pages, and then press the print button.
a page via email, Facebook, Twitter and more.
TO VIEW PREVIOUS EDITIONS
, click the
button at the bottom of the screen.
Beyond the Bale : December 2014
ON FARM 33 100 90 80 70 60 50 40 30 20 10 0 Survivaloflarvae(%) Days of survival Survival of barber’s pole worm infective larvae on pasture at various daily maximum temperatures and 60% relative humidity 0 30 60 90 120 150 180 210 15°C 10°C Daily maximum temperature 20°C 30°C 25°C 35°C Drench sheep on entry to the clean paddock (but consider how you will manage the increased risk of developing drench resistance) As the paddock will have a very low level of larvae, worms will take a fair time to build up and the pasture will often be used by the time levels are getting higher. This strategy does, however, favour the development of drench resistance, so follow the practices outlined at www.wormboss. com.au (select Tests & Tools from the menu and then click on Managing Drench Resistance) to manage this. WEC (worm egg count test) the sheep after 4–6 weeks to check the result WECs of sheep grazing the low worm-risk pasture should be substantially lower than in the past without grazing management or compared to a similar current mob that have not had a low worm-risk paddock. If results are not as good as expected, review your procedures, eg was a mob of wormy sheep moved through this paddock on the way to the yards for drenching? Or it may be that the starting level of worm larvae was very high and you will need another year of the treatment to gain better control. Grazing management can drastically reduce the need for drenching and the adverse effects of worms on particularly susceptible sheep. While the process is quite clear, the guidelines must be strictly followed to achieve success. Each WormBoss program explains the grazing management procedures for each region, go to www.wormboss.com.au and select Your Program. FIGURE 1. Survival of barber’s pole worm infective larvae on pasture at various daily maximum temperatures and 60% relative humidity. Source: Wormboss—Modeled from death rate of the L3 population in ‘Simulation of pasture larval populations of Haemonchus contortus’ by IA Barger, PR Benyon & WH Southcott. Proceedings of the Australian Society of Animal Production (1972) 9: 38 3 MORE INFORMATION www.wormboss.com.au Deb Maxwell P 02 6779 4262 E firstname.lastname@example.org 4 A new DNA test can identify the different types of worms in a mob and guide treatment choices. Outbreaks of barber’s pole worm in central and southern NSW have highlighted the benefits of knowing what types of worms are actually present, so that effective treatments can quickly be used. But it’s not just NSW. With varied seasonal conditions, areas of Victoria, Tasmania, South Australia and Western Australia see barber’s pole worm where scour worms are typically the problem. In northern NSW and Queensland, the reverse can be true. Wormboss.com.au, Australia’s sheep worm control resource, recommends worm egg counts with larval cultures to identify worm species, but the skills to identify different worm species is a specialist task that few laboratories can now do with accuracy. Dr Lewis Kahn, the Executive Officer of ParaBoss (which manages WormBoss, FlyBoss and LiceBoss), said, “A new DNA test has solved this lack of skills. The test identifies the different types of roundworms with their proportions calculated in a fraction of the time and with improved accuracy compared to traditional larval cultures.” Researchers at the University of Melbourne, in collaboration with AusDiagnostics, developed this novel approach for the specific diagnosis of the most important roundworm types infecting sheep, including barber’s pole worm, brown stomach worm, black scour worms, small intestinal worms, large-mouthed bowel worm, nodule worms and large bowel worms. This new diagnostic approach uses minute amounts of roundworm DNA present in the faeces of infected sheep. The test can be conducted within 2-3 days, rather than the 7 days required for the conventional larval culture technique, and has improved sensitivity and accuracy. It is still used in conjunction with a normal worm egg count, but allows the diagnosis of a wide range of roundworm parasites with high precision. The new test has so far been installed at Veterinary Health Research (VHR) in Armidale, NSW (in collaboration with Merial Australia) and Gribbles Veterinary in Clayton, Victoria. Dr Kahn believes that this new test will enable sheep producers to respond faster to worm infections and provides a more accurate indication of drench resistance across worm types. “Identifying the level and species of roundworm infection in a mob is essential for making optimal decisions about if, and when, animals should be treated, and allows producers to design control programs and use products that will target the particular roundworms that are present.” CONTACT Lewis Kahn E email@example.com P 02 6773 2997 M 0427 711 273 DNA TEST SHEEP WORMS The new DNA test can differentiate the worms in a mob and guide treatment choices well before sheep become badly affected with bottle jaw (the swelling below the normal line of the jaw shown below the dotted line).