Feed Lot

MAR 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

Issue link: https://feedlotmagazine.epubxp.com/i/948915

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Page 5 of 31

Hold the Oil Oil Removal From Distillers Grains In An Evolving Ethanol Industry B y ROBERT JONES M.S. AND JASON WARNER. PH.D. RUMINANT NUTRITIONISTS GREAT PLAINS LIVESTOCK CONSULTING, INC ne could make a very strong argument that the development of the bio-fuel indus- try and proliferation of dry-mill ethanol plants across the major grain production regions of the U.S. has had the single greatest im- pact on how we feed cattle over the last 25+ years. There certainly have been many other advances made in the field of cattle nutri- tion, but the increased production of an economical feedstuff such as distillers grains is arguably one of the greatest. Distillers grains are not only nu- trient dense but also provide many inherent feeding benefits such as ration conditioning and improved palatability. As with any business, the ethanol industry has changed over time. Extraction of oil from distillers grains is one of those changes that has understandably received much attention from the cattle industry. Nutritionally the oil represents an energy source con- taining 2.25 times the energy of a carbohydrate. The recent develop- ment of the biodiesel industry has increased the demand for corn oil as a feedstock for biodiesel manu- facturing. Many plants have invest- ed in the technology needed to ex- tract the oil to meet that demand. The oil now represents an addition- al income stream, currently priced at $0.23/lb., and it has been estimat- ed that at least 80% of ethanol plants nationally are extracting oil for sale to manufacturers of biodiesel. The most common method used for extracting oil in dry-milling ethanol plants is through the liquid syrup or solubles stream. Grain is first ground through a hammer mill and then water, enzymes, and yeast are added for fermentation. Once the slurry or mash is fermented, it undergoes distillation to remove the ethanol and then it is cen- trifuged and separated into thin stillage and wet grains. The thin stillage is subsequently evaporated to remove excess moisture and concentrated into syrup (called sol- ubles). It is the syrup that is cen- trifuged yet again to separate the oil, and then the syrup or solubles is added back to the wet grains to form distillers grains plus solubles. Corn and milo are the two most common grains used for ethanol production in the U.S. Corn usually runs about 4% fat and milo closer to 3%, so distillers grains with no oil removed will typically be 11-12% fat depending on grain source. Cen- trifuging the syrup will remove ap- proximately 1/3 of the oil which will reduce the fat content of the final product to 7.5-8%. There is variation due to many factors (grain source, plant operations, season of the year) both from plant to plant and also within a specific plant. Much research has been con- ducted to better understand the im- pact that oil removal has on cattle performance, and in general re- sults have been variable. In finish- ing rations, distillers grains are commonly fed as either an energy 6 FEED•LOT  March 2018 FEEDLOT FOCUS o

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