Feed Lot

JUN 2018

Feedlots and cow/calf operations in the beef industry who feed 500 or more has annually on grains and concentrates; maintain 500 or more beef cows; backgrounder, stocker/grower, preconditioner; veterinarian, nutritionist, consultant

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FEED•LOT June 2018 15 is their use as the sole means of fly control. While they may still provide some benefit when used alone, feed-through pesticides are not a "silver bullet," and perform best when used as a component of a comprehensive fly control program. Thus, it is recommended that they be used in combination with other methods of control, such as insecticide-impregnated ear tags (fly tags), administration of topical insecticides (sprays, pour-ons, rubs, etc.), and proper manure manage- ment. The latter of these – proper manure management – is the area that is most commonly overlooked. In scenarios without manure man- agement – and trust me, they exist – the efficacy of these products is substantially limited, as flies will almost always have access to ma- nure that was not exposed to the product. Take the necessary steps to ensure that "old manure" doesn't limit product efficacy. FL designed to do, rather than lack of efficacy. Similarly, larvicides may affect insects other than flies that also reproduce in manure. In order to maximize efficacy of either a feed-through IGR or larvicide, it is important to ensure that they are used correctly. Since they elicit their effect on flies in manure, they must be present in the manure in order to do so. This means that you need to be ahead of the game, and begin feeding these products at least one month prior to fly emergence. If you don't begin feeding either of these products until flies are already a problem, you're going to limit their efficacy, as flies have been given the op- portunity to breed and develop in manure that has not been exposed to the product. In these situations, flies have essentially been given a one-month head start. Similarly, product efficacy is dependent upon feeding these products throughout the duration of the fly season. As a result, it is necessary to extend feeding through the second major killing frost. Because these products work in a dose-dependent manner, it is imperative that cattle consume the necessary (labeled) amount of product. This means that cattle must consume the amount of feed required to deliver the necessary level of IGR or larvicide, and they must do so on a consistent basis. Take steps to ensure that these products are being consumed in a manner that will allow consistent delivery of the necessary amount of drug to manure. If using a free- choice mineral supplement as your vehicle of delivery, this requires tracking mineral consumption, and re-locating mineral feeders as nec- essary to achieve consistent intake of the necessary amount. Another factor that limits the efficacy of feed-through products Rotator® Technology for Pivot Irrigation Mitigate Dust & Cool the Herd with Nelson Big Gun® Sprinklers, Control Valves & TWIG® Wireless Controls nelsonirrigation.com / Tel: +1 509.525.7660 Automation The Original Big Gun® Sprinkler

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