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Beyond the Bale : March 2015
ON FARM 41 TO DIP, SPRAY, JET OR BACKLINE? LICE AND FLY CONTROL Backline applications are convenient and fast. Source: Peter James Applying backline or spray on products certainly reduces labour, but are they always your best bet? Fly and lice products come in a variety of formulations so that sheep can receive a backline (pour on) or spray on, be hand-jetted, put through a jetting race, dipped in a plunge or cage dip, or held in a shower dip. When making your choice of product, consider two main factors. Firstly, the chemical group you wish to use (so you can rotate chemical groups each time); some can only be applied by particular methods. Secondly, the availability of suitable equipment; existing equipment found on many farms does not deliver the chemical treatment effectively (ie the firefighting hose). Beyond these factors, the labour required and the speed and ease of use are key considerations. Detailed instructions to get the best from your product and a full list of advantages and disadvantages can be found on the LiceBoss and FlyBoss websites, which are managed by the AWI and MLA funded ParaBoss project, along with WormBoss. These sites are Australia’s premier resource for lice, flystrike and worm management. Some critical factors for each method are summarised below. BACKLINE OR SPRAY ON PRODUCTS For lice treatments, application pattern and dose rates are critical; check that the applicator is really delivering the correct dose. Fly spray ons do not spread; they must be applied to areas needing protection. HAND-JETTING For body strike protection, complete penetration of dip fluid into fleece to the skin on the topline is essential, so jetting fluid runs down the sheep’s sides at skin level to emerge at the belly. Where breech strike protection is needed, jet each side of the crutch. A pressure gauge at the hand piece is essential to ensure fluid is being delivered at greater than 700 psi. AUTOMATIC JETTING RACES Numerous equipment factors need to be correct. All details can be found in the table on 'Recommendations for AJR design and operation' in the Treatment section on the FlyBoss website. Methods to attain even sheep flow through the race must also be considered. PLUNGE AND CAGE DIPS Sufficient time submerged is essential for complete wetting. A bottom floor length of nine metres is needed for straight plunge dips; curved dips can be shorter, as the curve slows the sheep. In cage dips, sheep are submerged for a similar time, but ensure there are failsafe mechanisms to raise sheep or swiftly empty dip if a hydraulic or power failure occurs. SHOWER DIPS Only the Buzacott shower dip can be recommended for lice treatments, as all others fail to completely wet the sheep. Pressure, spray pattern and time (minimum of 12-15 minutes) in the dip are critical. All dipping requires precautions for hygiene of the dip fluid to lessen the spread of disease, especially where dip fluid is recirculated. FlyBoss does not recommend dipping for flystrike, for either prevention or treatment of strike. All lice and fly chemical application methods have the potential to succeed or fail. Equipment must be suitable and set up correctly, and operators must take time and care with every sheep. MORE INFORMATION www.flyboss.com.au www.liceboss.com.au Lewis Kahn Executive Officer ParaBoss E firstname.lastname@example.org P 02 6773 2997 M 0427 711 273 Subscribe to ParaBoss News, the monthly email with updates and feature articles on worms, flystrike and lice, at www.paraboss.com.au WITHHOLDING PERIODS Always check the label before treatment to ensure withholding periods suit the sheep you intend to treat. • Meat Withholding Period (Meat WHP): the time from chemical application to when an animal is slaughtered for domestic use. • Export Slaughter Interval (ESI): the time from chemical application to when an animal is slaughtered for export. • Wool Harvesting Interval (WHI): the time from application of a chemical to when the wool can be harvested to satisfy Australian environmental requirements (also includes crutching). • Wool Rehandling Period: the time between treatment and when wool/ sheep can be safely handled without the need for protective clothing. • Milk Withholding Period (Milk WHP): the time from chemical application to when milk can be taken from the animal for human consumption. OPERATOR SAFETY Careless application of fly and lice chemicals can result in illness. A full list of OH&S procedures is on the FlyBoss site. • Follow the safety direction on the label. • Store chemicals correctly and securely. • Wear protective gear. • Carefully pour and mix chemicals. • Have water, soap and towel ready to wash splashes off. • Have clean-up equipment ready for spills. • Wash hands before eating, drinking or smoking. • Wash and store equipment straight after use. • Change your clothes when you have finished chemical work.