Feed Lot

SEP-OCT 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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34 FEED•LOT September/October 2018 Injectable Minerals Can Enhance Stocker Calf Health all essential trace minerals. Hansen recommends testing water sources for concentrations of sulfur or iron. Other antagonists, such as molyb- denum, also bind trace minerals in the rumen, making them unavail- able to the animal. "Injectable minerals can be a powerful tool to quickly improve the trace mineral status of cattle," Hansen concludes. "Producers need to have a good understanding of other products, especially seleni- um, going into calves when they are received. If you're a stocker opera- tor, you need to have an apprecia- tion for what the previous mineral status of that calf is, particularly if it received injectable minerals recently. Be careful not to double dip on that. Definitely, read the label and follow the instructions." David Sturgeon, D.V.M., operates a pre-conditioning yard in Cordell, Oklahoma, where he raises high- stress, commingled calves with unknown backgrounds. "There's a good chance a per- centage of them could either be be- low normal levels or at the low end of their trace minerals," Sturgeon reports. "Using injectable trace minerals is a good way to make sure we start that set of calves, so our S ale barn calves are often high-risk animals, simply because the buyer has no way to know exactly what environment they come from. Sometimes bull calves and steers have not received extensive preconditioning, mineral supplementation or additional health protocols. The producer's goal is to promote calf health, aiming for a two-pound average daily gain. Successful stocker operators frequently rely on injectable trace mineral supplementation to increase the well-being and productivity of these cattle. Larry Hollis, D.V.M., retired Kan- sas State University veterinarian, says injectable minerals give pro- ducers a chance to improve trace mineral deficiencies. "The huge difference with an injectable mineral vs. oral is speed, how fast we get it into the animal so it goes to work," Hollis reports. "We know that injectable mineral's peak absorption occurs eight to 10 hours post-injection. The majority of the product is absorbed within the first 24 hours, moving to the site of need. If there's excess above what is immediately needed in the body, it'll go to the liver, where it is stored and used over time. Inject- able minerals don't replace a good oral trace mineral program, which calves need for maintenance." Stephanie Hansen, Ph.D., Feed- lot Nutritionist with Iowa State University, has conducted several injectable trace mineral trials. In a recent study, stockers were back- grounded in the university's feedy- ard on a high roughage diet, some of them receiving antagonists, sul- fur and molybdenum. Sorted into separate mineral supplementation groups, Hansen found a significant boost in trace mineral status 14 days after calves received Multi- min ® 90, an injectable mineral. Data suggests animals treated with inor- ganic and chelated-organic mineral blends reached the same level after 28 days as cattle treated with in- jectable trace minerals. The group receiving only inorganic minerals took about a month and a half to reach the same trace mineral status as the injected calves. "We actually found that regard- less of dietary antagonists, the Mul- timin ® 90 response was extremely consistent," Hansen explains. "That tells us it can be a powerful tool to quickly improve [mineral] status of animals, even when they're being fed a high-antagonist diet." Producers often feed distiller's byproducts, however they should account for sulfur in molasses, lick tanks, lick tubs or distiller's byproducts. Sulfur can tie up cop- per, zinc, manganese and selenium, BY GILDA V. BRYANT STOCKER SPECIAL

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