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 2016
FLOODING Sheep isolated due to floodwaters face a particular risk from worms and flystrike. When continually grazing the same small area, worm populations rapidly build, even from an initial low level of infection. Maggots drop from struck sheep that cannot be attended due to isolation. The maggots pupate in the soil for about one week and re-emerge as flies to strike other susceptible sheep. Illness from these parasites and any other diseases will be compounded if the wet conditions restrict feeding and sheep lose condition. ACTIONS: • If floods or wet conditions are predicted and could isolate sheep for some weeks, drench them just before the flood arrives and then move them to high ground. • A flystrike preventative treatment may be warranted at the same time. • Consider a long-acting treatment against barber’s pole worm if the isolation is expected to be six weeks or more. FREQUENT RAIN A colder spring may have delayed emergence of flies in some areas, but in many regions there are already plenty about. Where sheep are subject to frequent rain events there will be a rise in the amount of fleece rot, the main cause of body strike. Better pastures are also likely to result in increased dag, which is a major cause of breech strike. Where marking occurs at this time, wounds will be a prime target for the extra fly pressure. ACTIONS: • Monitor for flies frequently, particularly for body strike 2–3 days after a rain event. • Be prepared to apply preventative treatments or to crutch earlier than usual this year. • Have chemical and equipment ready in advance. • Ensure all marking wounds are treated with an effective flystrike preventative, especially on the wool adjacent to wounds. WATERLOGGED SOIL Worm eggs can hatch without rain if the soil is waterlogged. While a cooler spring could have slowed development of some worms, they will be flourishing in the warmer climates. Expect more haemonchosis (barber's pole) this summer and autumn in areas with historically few problems. If it occurred last year, expect worse this year. Even if the frequent rain stops, infective larvae will remain on the pastures for months unless there are particularly hot and dry conditions. Lungworms are already causing illness this year. They prefer the cooler wetter conditions and cause loss of appetite, ill-thrift and coughing. ACTIONS: • Increase the frequency of Worm Egg Count monitoring to 4-weekly during risk periods, in particular through summer and autumn. • If coughing is noted, consult your veterinarian, as diagnosis of lungworm is not straightforward. Treatment with a benzimidazole (BZ) or macrocyclic lactone (ML) drench is generally effective. PARASITES AND DISEASE WET WEATHER CAUSES SURGE IN While plentiful rain is welcome for pasture growth, it brings a variety of issues well into the next season for sheep health, with parasites being at the top of the list. Blowflies can strike susceptible sheep that are isolated due to floodwaters. Lungworm prefer cooler, wetter environmental conditions. PHOTO: Dr Kristy Stone, Riverina Local Land Services Better pastures caused by good rain are also likely to result in increased dags. 46 ON FARM
In the Shops - March 2017