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Variation in Dried Distillers Grain with Solubles Variation in dried distillers grain with solubles (DDGS)
remains a concern of many nutritionists formulating swine and poultry
diets. Researchers analyzed 51 samples of DDGS samples collected from
ethanol plants in the United States and Canada. The crude protein content
of these 51 samples ranged from a low of 25.1% to a high of 31.1% crude
protein when standardized to an 88% dry matter basis. The average crude
protein was 27.5% with a coefficient of variation (CV) of 5.1%. Methionine
ranged from 0.46 to 0.66% with a CV of 8.04% and lysine values ranged
from 0.44 to 1.02% with a 18.31% CV. Of interest was the observation
that the correlation between methionine and lysine was only 0.57, which
is unusually low. Normally, amino acids are highly correlated with the
crude protein content of an ingredient. The researchers propose that
a possible explanation is that lysine was damaged during the drying
process. The lysine may have bond to reducing the sugars (a browning
reaction known as the Maillard reaction) reducing the amount and bioavailability
of the lysine. The researchers conclude that DDGS shipments should be
analyzed and rations formulated based on the individual analysis. The
relatively high CV may not be a practical problem in formulating swine
and poultry diets if the inclusion of DDGS makes up a small portion
of the crude protein. |
