Feed Lot

SEP-OCT 2017

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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with other bacteria that are not of the same species. Despite the groaning that has accompanied the Veteri- nary Feed Directive that w ent into effect January 1, S mith says working with government agencies to mit- igate overuse of antibiotics is in producers' best interest. The goal is judicious use, so producers can continue to use antibiotics, and they will continue to be effective. To help alleviate the prob- lem, producers should be selective about treating ani- mals, rather than always mass treating as a pre-emp- tive measure, according to Smith. Metaphylactic treatment on select groups of cattle can be a ju- dicious use of the product, depend- ing on the history and condition of the cattle. However, blanket-treat- ing every pen regardless of status is not. Administering antibiotics to animals that are not sick can set them up for a more resistant infec- tion down the road. Along with avoiding unneces- s ary use, it is crucial to make sure t he drug is the correct one for the affected organ and is given in the right dose. An animal's weight is the crucial factor for determining dosage. Smith cautions against mass treat- ing a pen of calves based on average weight. Studies have shown in such cases, calves on the lighter end of the spectrum had a higher rate of morbidity in reaction to a propor- tionately large dose on antibiotic. Treatment also needs to be for the right duration of time. Make sure to allow drugs time to work. "It's sometimes better to wait to re-treat," says Smith. "It you don't like the outcome, give it time to work." He cites studies that show better response to some drugs FEED•LOT  September/October 2017 19 Some cells are able to change the cell wall structure to be less permeable. Others degrade en- zymes and produce alternative pro- teins. Some even create resistant genes and are able to share them u

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