Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 12/10/2004
Publication Date: 7/17/2005
Citation: Chevanan, N., Rosentrater, K.A., Muthukumarappan, K. 2005. Physical properties of extruded tilapia fish feed with distillers dried grains. Meeting Abstract. American Soiety of Agricultural Engineers Annual International Meeting. July 17-20, 2005. Tampa, FL.
Technical Abstract: Distillers' dried grains (DDG) from ethanol manufacturing plants contain a high percentage of protein, and are primarily used as livestock feed. The conversion efficiency of feed into body tissue is generally much higher in fish than farm animals, however. Fish can convert up to 36% of feed protein into body protein, whereas beef typically converts only 15%. Therefore, the objective of this study was to quantify physical properties of extruded tilapia fish feed which contained different levels of DDG. Fish feed containing a high protein-to-energy ratio of 45% protein to 450 Kcal/100 grams of feed is generally recommended for adequate growth rate for tilapia fish. Thus, three fish feed formulations containing 22, 26 and 30% of DDG along with appropriate levels of fish meal, soybean meal, cod liver oil, vitamin mix and mineral mix were prepared with a protein-to-energy ratio of 45% to 460 Kcal/100 gram of feed. These ingredient blends were extruded in a barbender single screw extruder at 110, 120, and 130 degrees C with 10, 20 and 30% moisture content. The moisture content, bulk density, porosity, water absorption index and color of the resulting extruded fish feed were then determined.