| In order to produce a kind of sinking extruded feed with low-pollution, high conversion rate and environment friendly for Ayu, Plecoglossus altivelis, this paper took swelling degree, approximate density and water stability of sinking extruded feed as important indicators, estimated the effects of material moisture content, screw speed and screw extrusion temperature on feed characteristics by single factor test and orthogonal experiment. The results showed that feed moisture content, screw speed and barrel temperature, rear feed temperature all affected the swelling degree, approximate density and water stability of feed. And, orthogonal ANOVA result showed that the barrel temperature had significant effect on approximate density. Through single factor test and orthogonal experiment, the processing parameters of feed extrusion were as follows: feed moisture content of 30%, barrel temperature at 90℃, screw speed of 90 r/min, under these conditions, feed product with maximum approximate density and better water stability was produced and were also better able to satisfy Ayu’s requirement. |
