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 : May 2010
May 2010 BEYOND THE BALE Worm egg counting COLLECTING SAMPLES There are two ways dung samples can be collected: freshly deposited dung off the ground or directly from the rectum of the sheep. If collecting for normal monitoring of a mob, sheep need not be yarded as collection of freshly dropped, clean faecal samples from the paddock will suffice. The sheep can be quietly held against a fence for 10 to 20 minutes, allowed to walk off and fresh dung collected off the ground, taking care not to collect too much dirt and other debris with the sample. Often sheep are 'on camp' in the early afternoon (noon to 1pm) and this is a good time to quietly approach the mob, get them to stand for a short time before moving them off camp and then collect samples from the fresh dung piles. Faecal samples can be collected directly from the rectum of individual sheep with a gloved finger. This is the preferred technique when it is important to have individually identified samples, such as when selecting animals for worm resistance. YOUR COUNTING OPTIONS 1. Laboratory The collected samples can be sent to a laboratory for analysis as soon as possible after collection. A WEC on 10 faecal samples from a mob will generally cost between $50 and $100 in laboratory charges. Contact your local veterinarian, sheep consultant or laboratory to discuss specific sampling and laboratory requirements for WECs. 2. Do your own counts Some farmers do their own WECs. Learning to do worm egg counts is not difficult. However, you will also need the discipline to regularly collect the required number of samples and follow the correct procedures on each sample if you are going to get a credible result. You will need a laboratory microscope (hobby ones are not suitable), an egg-counting chamber, some beakers and mixing implements and a supply of saturated salt solution. Training is available through some state departments of agriculture and other training organisations. There are also commercially available WEC kits. You should check the accuracy of your WECs by conducting comparison testing which is available from some accredited laboratories. If you want to know the species of worms present, you will have to send dung samples to a laboratory offering that service. When it is important to have individually identified faecal samples, such as when selecting animals for worm resistance, the samples can be collected directly from the rectum of individual sheep. My Lice Control Didn't Work, What Now? This is a common question asked of our lice control advisors. The common response is to ask, "Which part of your lice control didn't work?" Usually this question is followed by a lengthy pause. After any breakdown in lice control the first assumption is usually that the lice control chemical must have failed. However, the most common reasons for breakdowns in lice control are management related and include: • Split shearings • Introduced or stray sheep re-infecting the mob • Not treating rams, lambs, shedding sheep breeds or killers leading to re-infestation • Sheep missed at muster • Incorrect product application However for the purpose of this article let's assume that the prod- uct being used has failed and that you suspect resistant lice are present. Well there is good news here in a couple of areas. Firstly, there are many different chemical options with different modes of action to treat lice. Coopers produce more lice protec- tion products than any other company and can always identify a product to suit your individual situation. Lice are host specific. Sheep lice complete their lifecycle on sheep. This means that if you wipe out a resistant population of lice from your property you should then endeavour to keep your flock lice free. If you are then re-infested with lice at a later time from a new source you can consider a return to your previous control product if those lice are not likely to be resistant. Here is a practical example. Assuming a suspected resistance to IGR backliners. An ideal move would then be to plunge dip your sheep, either yourself or by using a dipping contractor, with Coopers Assassin®. Plunge dipping sheep is still the gold standard for lice control and while diazinon, previously the mainstay of plunge dipping is no longer registered for this purpose, Coopers Assassin is every bit as ef- fective as diazinon, without the same level of associated operator risks. By using Coopers Assassin for a couple of years - while at the same time ensuring that your entire lice control management programme is adhered to, such as a single shearing, effective application technique, maintaining good boundary fences and quarantine dipping introduced stock, etc, you should eliminate the resistant lice population from your property. At this stage you are free to return to your previous chemical method of control if re-infestation was to occur with susceptible lice. For those who are not in a position to plunge dip their sheep, a similar program could be utilised using Coopers Eureka Gold®, which uses the active ingredient diazinon as a high volume back- line spray. The best advice in any situation where you have a concern about any aspect of your lice control is to contact your local Coopers lice control expert on 1800 885 576. We are happy to discuss your options. And assist you in achieving and maintaining a lice free flock. You can be assured that with our large portfolio of lice control options and our unrivalled expertise in this area that we will find a solution tailored to your needs. www.liceprotectionplus.com.au AWI does not give any warranty or representation as to the accuracy, reliability or completeness of the information. To the extent permitted by law, AWI and its employees, officers and contractors shall not be liable for any loss or damage arising in any way (including by way of negligence) from or in connection with any information provided or omitted or from any one acting or refraining to act in reliance on this information. ® Registered trademark. Ask the Coopers® Expert