Feed Lot

APR-MAY 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 April/May 2018 7 or purchased at a similar cost to conventional corn and yields are equal, there is an apparent econom- ic incentive to do so. Recent interest in Enogen hy- brids has focused on utilization as corn silage. There is limited research on Enogen corn silage, especially in beef cattle rations and the data has not shown clear evidence that Enogen corn silage performs better than conventional corn silage. Amylase does not play a part in fiber digestion, so if further research shows an improvement due to feeding Enogen corn silage, there must be another factor con- tributing to the improvement which is not yet known. Clearly, continued research is needed to determine the value of Enogen corn silage in beef cattle rations. FL For more information on this or other nutritional topics, visit Great Plains Livestock Consulting, Inc. at www. gplc-inc.com The increased feeding efficien- cy of Enogen corn processed by dry-rolling led to the hypothesis that starch digestion is being in- creased when feeding Enogen corn. A metabolism trial was conducted to determine the site and extent of digestion and ruminal metabolism characteristics. In this experiment, cattle fed Enogen DRC had numer- ically greater post-ruminal starch digestibility, excreted lower fecal starch, and had greater total tract starch digestibility compared to conventional corn. There were no differences observed for any ruminal pH characteristics or VFA proportions due to corn trait or byproduct type. This observation proves that the hypothesis from the first trial was incorrect and that the cattle were not experiencing ruminal acidosis that would mask the effects of Enogen corn. The increase in utilization of an energy source, such as starch, explains the increase in performance that was observed in previous experiments. Although previous trials have shown an improvement in feed efficiency when feeding Enogen DRC, the response has been vari- able. A large, well-replicated trial was needed to verify the impacts of Enogen DRC on finishing cattle performance. In this trial, the re- searchers observed no statistical difference for final body weight, dry matter intake, average daily gain, or feed efficiency for steers fed Eno- gen corn compared to conventional corn. Although not significant, feed efficiency was numerically 1.6% poorer for Enogen DRC compared to conventional corn. Although performance data has been variable, if feeding Enogen corn processed by dry-rolling, neg- ative impacts have not been sig- nificant and there is potential for improved performance of feedlot cattle. If Enogen corn can be raised

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