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ARS Home » Plains Area » Brookings, South Dakota » Integrated Cropping Systems Research » Research » Publications at this Location » Publication #245656
Title: The Effects of Extrusion Processing of Distillers Dried Grains with Solubles (DDGS)-Based Yellow Perch (Perca flavescens) Feeds

Author
item AYADI, FEROUZ - South Dakota State University
item MUTHUKUMARAPPAN, M - South Dakota State University
item Rosentrater, Kurt

Submitted to: Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 9/18/2009
Publication Date: 9/18/2009
Citation: Ayadi, F., Muthukumarappan, M., Rosentrater, K.A. 2009. The Effects of Extrusion Processing of Distillers Dried Grains with Solubles (DDGS)-Based Yellow Perch (Perca flavescens) Feeds. ASABE/CSBE North Central Intersectional Meeting, Brookings SD, September 18-19, 2009.

Interpretive Summary: This study was conducted to investigate the production of balanced diets for juvenile yellow perch (Perca flavescens) feeds. Six isocaloric (3.20 kcal/g), isonitrogenous (31.5% db) ingredient blends were formulated with 0, 10, 20, 30, 40 and 50% distillers dried grains with solubles (DDGS) at a feed moisture content of 60-65% db, with appropriate amounts of soybean meal, fish meal, vitamin and mineral mix. Extrusion cooking was performed using a laboratory-scale single screw extruder at a constant barrel temperature profile of 40ºC-90ºC-100ºC, and a constant screw speed of 230 rpm (24.1 rad/s). During processing the mass flow rate was determined, which generally increased with progressively higher DDGS content. Additionally, moisture content, water activity, unit density, expansion ratio, compressive strength, compressive modulus, pellet durability index, water stability and color were extensively analyzed to quantify the effects of varying DDGS content on the physical properties of the final extrudates. Significant differences (P<0.05) between the blends were observed for color and water activity of the raw and extruded material, and for the unit density of the extruded product. There were significant changes in brightness (L), redness (a) and yellowness (b) between the final products when increasing the DDGS content of the blends. Expansion ratio and compressive strength of the extrudates were low. On the other hand, all blends showed high pellet durability indices. Overall, each of the ingredient blends resulted in viable extrudates.

Technical Abstract: This study was conducted to investigate the production of balanced diets for juvenile yellow perch (Perca flavescens) feeds. Six isocaloric (3.20 kcal/g), isonitrogenous (31.5% db) ingredient blends were formulated with 0, 10, 20, 30, 40 and 50% distillers dried grains with solubles (DDGS) at a feed moisture content of 60-65% db, with appropriate amounts of soybean meal, fish meal, vitamin and mineral mix. Extrusion cooking was performed using a laboratory-scale single screw extruder at a constant barrel temperature profile of 40ºC-90ºC-100ºC, and a constant screw speed of 230 rpm (24.1 rad/s). During processing the mass flow rate was determined, which generally increased with progressively higher DDGS content. Additionally, moisture content, water activity, unit density, expansion ratio, compressive strength, compressive modulus, pellet durability index, water stability and color were extensively analyzed to quantify the effects of varying DDGS content on the physical properties of the final extrudates. Significant differences (P<0.05) between the blends were observed for color and water activity of the raw and extruded material, and for the unit density of the extruded product. There were significant changes in brightness (L), redness (a) and yellowness (b) between the final products when increasing the DDGS content of the blends. Expansion ratio and compressive strength of the extrudates were low. On the other hand, all blends showed high pellet durability indices. Overall, each of the ingredient blends resulted in viable extrudates.