ARS | Publication request: Effect of starch sources on extruded aquaculture feed containing DDGS

Submitted to: Meeting Abstract
Publication Type: Abstract
Publication Acceptance Date: September 29, 2007
Publication Date: October 12, 2007
Publisher's URL: http://www.asabe.org
Citation: Kannadhason, S., Muthukumarappan, K., Rosentrater, K.A. 2007. Effect of starch sources on extruded aquaculture feed containing DDGS. ASABE/CSBE North Central Intersectional Conference, Fargo ND, October 12-13, 2007.

Technical Abstract: Aquaculture is one of the most rapidly growing sectors of agriculture, and is a reliable growth market for the prepared feeds. A Brabender laboratory-scale single screw extruder was used to study the effect of various starch sources (cassava, corn, and potato), DDGS levels (20, 30, and 40% (wb)), and protein levels (28, 30, and 32% (wb)) on the physical properties of resulting extrudates (unit density, color, sinking velocity, water absorption, water solubility, and pellet durability indices). These ingredients blends, containing varying levels of DDGS, cassava, corn, or potato starch, and other common ingredients (soy flour, fish meal, whey protein, vitamin, and mineral mix) were prepared. The feed blends, moisture balanced for 20% (wb), were extruded with a barrel temperature of 120 oC and preset screw speed of 130 rpm. For all three starch bases, increasing the DDGS level, showed a significant increase in sinking velocity, redness (a*), and blueness (b*), and had a negative relation with brightness (L*). With the increase in DDGS and protein levels, a noticeable increase was observed on unit density and pellet durability indices for cassava and potato starch extrudates. The extrudates produced from cassava starch with low DDGS (20%) and protein (28%) levels showed better expansion and hence floated. Also, the extrudates produced from corn starch with higher DDGS (40%) and protein (32%) levels were more durable. In conclusion, cassava and corn starch, incorporated with lower and higher levels of DDGS are best suited for floating and sinking aquaculture feeds, respectively.