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Swine researchers seek answers to fiber's low digestibility
Date:9/8/2010

As interest grows in feeding distillers dried grains with solubles (DDGS) to growing pigs, many questions are being asked about the digestibility of this alternative feed option.

"Previous research shows that while the amount of energy in DDGS is greater than that of corn, pigs have lower digestibility of energy in DDGS than in corn," said Hans H. Stein, U of I associate professor in the Department of Animal Sciences. "Our goal was to find out why."

Stein's team wanted to develop a greater understanding of the digestibility differences between DDGS and corn. He said the biggest difference between corn and DDGS is fiber content. Fiber contributes to the total energy in DDGS, but not much is known about how pigs utilize the fiber in DDGS.

"We want to find ways to improve the utilization of this energy source in a swine diet," he said. "But first we need to understand the role of fiber in DDGS."

Our research demonstrated that overall, the utilization of fiber in DDGS is low less than 50 percent. Fiber is characterized as soluble or insoluble fiber. The soluble fiber consists of pectins, some hemicelluloses and some oligosaccharides, Stein said.

"Soluble fiber will change the viscosity of the digesta in the intestinal tract while absorbing water and becoming easily fermentable in the intestinal tract," he added.

On the other hand, insoluble fiber will not dissolve in solution and is made up of the hardest part of the plant such as cellulose and lignin. These fibers do not change viscosity in the intestinal tract and they are the most difficult to ferment.

"Pigs utilize soluble fiber very well, almost 90 percent," Stein said. "Unfortunately, most of the fiber in DDGS is insoluble and has a much lower digestibility. This is the reason for the low digestibility of the combined fiber fraction in DDGS. However, if we can do anything to change the solubility of fiber and make it more soluble, we know we c
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Contact: Jennifer Shike
jshike@illinois.edu
217-244-0888
University of Illinois College of Agricultural, Consumer and Environmental Sciences
Source:Eurekalert

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