By Bruce Cochrane
An animal science professor with the University of Minnesota says the added nutritional variability caused by the extraction of oil from corn dried distillers grains with solubles has raised the need for tools that will provide accurate estimates of the energy values of these ingredients.
The vast majority of U.S. ethanol plants use corn.
The starch in the corn is converted into ethanol leaving dried distillers grains with solubles, or DDGS, a byproduct used primary in livestock rations.
Dr. Gerald Sureson, an animal science professor with the University of Minnesota, says the nutritional value of DDGS has always been a fairly variable and now it's even more variable.
Dr. Gerald Sureson-University of Minnesota:
Probably over about the last year and a half the ethanol industry has been looking for ways of increasing revenue.
Profit margins for ethanol production, partly due to high corn prices and lack of corn availability, have caused these plants to ask what else can we market that will bring more revenue or potentially get us back into the positive profit margin.
There's a fairly new technology.
It's fairly simple but many of these ethanol plants, as a matter of fact probably 60 to 70 percent of the industry now, has been extracting some of the corn oil out of DDGS because there's a very high demand in the U.S. for not only corn oil but other vegetable oils and animal fats to go into the biodiesel industry.
It's been a lucrative market and these ethanol plants have responded by extracting some of the oil.
The difference now compared to what used to be is that many of these ethanol plants or DDGS sources, instead of containing 10 to 12 percent oil, now contain maybe seven to eight percent because of this partial oil extraction.
Dr. Sureson notes nutritionists like predictability and consistency in the ingredients they use so one of the biggest challenges, as the U.S. ethanol industry evolves, is how are we going to manage this wider diversity of corn co products.