|Dozier Iii, William|
|Shruson, Gerald -|
Submitted to: Journal of Animal Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: March 24, 2013
Publication Date: July 15, 2013
Citation: Kerr, B.J., Dozier, III, W.A., Shurson, G.C. 2013. Effects of reduced-oil corn distillers dried grains with solubles composition on digestible and metabolizable energy value and prediction in growing pigs. Journal of Animal Science. 91:3231-3242. Interpretive Summary: The expansion of the ethanol biofuel industry has generated a variety of co-products, which due to availability and price, have become available for use as a potential feedstuff for growing swine. Most recently, ethanol companies have been extracting a portion of the oil from distillers dried grains with solubles (DDGS) resulting in a product called reduced oil-DDGS (RO-DDGS). To date, however, it is not known the impact of this oil extraction on the caloric value to growing pigs. This research demonstrated that the caloric value of RO-DDGS is indeed less than that of higher oil-DDGS, but the caloric value to the growing pig depends more upon its fiber concentration and not on its oil concentration. This information is important for nutritionists at universities, feed companies, and swine production facilities for the determination of the energy value of RO-DDGS for use in feed formulations, and provides a basis from which to assess its economic value.
Technical Abstract: Two experiments were conducted to determine the DE and ME content of corn distillers dried grains with solubles (corn-DDGS) containing variable ether extract (EE) concentrations and to develop DE and ME prediction equations based on nutritional measurements. Ether extract content of corn-DDGS ranged from 4.88% to 10.88% (DM basis) among 4 corn-DDGS samples in Exp. 1 and from 8.56% to 13.23% (DM basis) among 11 corn-DDGS samples in Exp. 2. The difference in concentration of total dietary fiber (TDF) and NDF among the 4 corn-DDGS sources was 2.25 and 3.40 percentage units, respectively in Exp. 1, but was greater among the 11 corn-DDGS sources evaluated in Exp. 2, where they differed by 6.46 and 15.18 percentage units, respectively. The range in CP and ash were from 28.97 to 31.19% and 5.37 to 6.14%, respectively in Exp. 1, and from 27.69 to 32.93% and 4.32 to 5.31%, respectively, in Exp. 2. Gross energy content among corn-DDGS samples varied from 4,780 to 5,113 kcal/kg DM in Exp. 1, and from 4,897 to 5,167 kcal/kg DM in Exp. 2. In Exp. 1, the range in DE content was from 3,500 to 3,870 kcal/kg DM and ME content varied from 3,266 to 3,696 kcal/kg DM. There were no differences in ME:DE content among the 4 corn-DDGS sources in Exp. 1, but ME:GE content differed (P = 0.04) among sources (66.82 to 74.56%). In Exp. 2, the range in DE content among the 11 corn-DDGS sources was from 3,474 to 3,807 kcal/kg DM, and ME content varied from 3,277 to 3,603 kcal/kg DM. However, there were no differences in DE:GE, ME:DE, or ME:GE among sources in Exp. 2. In Exp. 1, no ingredient physical or chemical parameter measured (bulk density-BD, particle size, GE, CP, starch, TDF, NDF, ADF, hemicellulose, EE, or ash) was significant at P = 0.15 to predict DE or ME content in corn-DDGS. In Exp. 2, the best fit DE equation was: DE, kcal/kg DM = 1,601- (54.48 × % TDF) + (0.69 × % GE) + (731.5 × BD) [R² = 0.91, SE = 41.25]. The best fit ME equation was: ME, kcal/kg DM = 4,558 + (52.26 × % EE) - (50.08 × % TDF) [R² = 0.85, SE = 48.74]. Apparent total tract digestibility of several nutritional components such as ADF, EE, and N were quite variable among corn-DDGS sources in both experiments. These results suggest that although EE may be a good predictor of GE content in corn-DDGS, it is not a primary factor for predicting DE or ME content. Measures of dietary fiber, such as ADF or TDF, are more important than EE in determining the DE or ME content of corn-DDGS for growing pigs.