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Extrusion Studies of Aquaculture Feed using Distillers Dried Grains with Solubles and Whey

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Abstract

Three isocaloric (3.5 kcal/g) ingredient blends containing 20, 30, and 40% distiller-dried grains with solubles (DDGS) along with 5% whey were prepared with a net protein content adjusted to 28% (wet basis [wb]). Other ingredients in the blends included soy flour, corn flour, fish meal, vitamin, and mineral mix. These blends were extruded in a single-screw extruder at 15, 20, and 25% (wb) moisture content and at 130 and 160 rpm screw speeds. Compared to previous research, the durability and unit density of the extrudates in this study were found to increase substantially by the addition of whey to the blends. Increasing the DDGS content from 20 to 40% resulted in a 5.8 and 16.8% increase in extrudate moisture content and redness, respectively, but produced a decrease of 11.2% in brightness and 3.6% in yellowness of the extrudates. Increasing the moisture content of the ingredient blends from 15 to 25% resulted in an increase of 16.1, 8.7, and 9.3% in moisture content, durability, and redness, respectively, but a decrease of 9.8 and 5.6%, respectively, in brightness and yellowness of the extrudates. Neither DDGS level nor screw speed significantly affected extrudate durability or unit density. In fact, changing the screw speed had no significant effect on many of the properties of the extrudates studied, except for moisture content, redness, and yellowness. As demonstrated in this study, ingredient moisture content and screw speed are critical considerations when producing extrudates with feed blends containing DDGS; further work is needed to optimize processing conditions and to produce floating feeds.

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Funding support

We thankfully acknowledge the financial support provided by the Agricultural Experiment Station, South Dakota State University, and the North Central Agricultural Research Laboratory, USDA-ARS, Brookings, SD.

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Correspondence to Kurt A. Rosentrater.

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Chevanan, N., Muthukumarappan, K. & Rosentrater, K.A. Extrusion Studies of Aquaculture Feed using Distillers Dried Grains with Solubles and Whey. Food Bioprocess Technol 2, 177–185 (2009). https://doi.org/10.1007/s11947-007-0036-8

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  • DOI: https://doi.org/10.1007/s11947-007-0036-8

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