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Effects of elutriation and sieving processing (Elusieve) of distillers dried grains with solubles on the performance and carcass characteristics of male broilers¹

R. E. Loar, II^*, R. Srinivasan, M. T. Kidd^*, W. A. Dozier, III and A. Corzo^*,2

^* Department of Poultry Science, Mississippi State University, and Department of Agricultural and Biological Engineering, Mississippi State University, Mississippi State 39762; and USDA, Agricultural Research Service, Poultry Research Unit, Mississippi State, MS 39762

² Corresponding author: acorzo{at}poultry.msstate.edu

A technique combining elutriation (air classification) and sieving was developed to remove some of the fiber component of distillers dried grains with solubles (DDGS). Herein, DDGS were sieved into 4 different sizes: large, medium, small, and pan. Fiber was removed from the 3 largest sizes by elutriation via an aspirator, whereby air was blown through the different size categories at a predetermined velocity as the product was falling from the sifter, through the aspirator, and into a collection container. This air movement resulted in a portion of the lighter fiber component being blown into a separate chamber of the respirator and thus into a separate container. The DDGS product obtained by mixing the material that underwent this procedure was called "big DDGS." The pan material, which was in the smallest size category, has a lower fiber concentration and thus underwent no elutriation (pan DDGS). Four different dietary treatments with 12 replicates each were fed to Ross x Ross 308 male broilers from hatch until 42 d of age. A corn- and soybean meal-based diet without DDGS served as the control (treatment 1); treatment 2 had conventional DDGS included at a concentration of 8% (unmodified DDGS); treatment 3 consisted of 8% big DDGS inclusion (partially modified DDGS, PMD), and the fourth treatment consisted of 8% pan DDGS (ED). Final BW was observed to be superior for the birds fed the ED-based diets compared with the BW of those birds fed the control diet and the PMD-based diet. However, contrast analysis showed a significant difference in BW (P = 0.08), with birds fed ED-based diets exhibiting higher BW compared with birds fed unmodified DDGS-based diets. Feed intake was numerically higher for birds fed ED-based diets compared with all other treatments and was significantly greater for birds fed ED-based diets vs. those fed PMD-based diets for the 0- to 42-d period. No other differences were found in bird performance or carcass traits. Results showed some improvement of DDGS via the use of this technology, judging by a marginal improvement in final BW.

Key Words: distillers dried grains with solubles • Elusieve • broiler

¹ This is Journal Article Number J11451 from the Mississippi Agricultural and Forestry Experiment Station supported by MIS-322220. Use of trade names in this publication does not imply endorsement by the Mississippi Agricultural and Forestry Experiment Station and USDA, Agricultural Research Service, of the products, nor similar ones not mentioned.