Abstract: Urea, a substitute of high grade proteins, may be used to feed the ruminant animals The amount of pure urea fed was limited largely as its high hydrolytic rate in the animals'rumen Thus, extruding method was applied to improve the quality of urea bearing feed Urea addition might be coated with boiled starch at its melted state by optimizing the parameters which affect the machine's performance Experimental results showed that if the \%L/D\%, the speed of screw, and the opening rate of the die was held at 10, 300 r/min and 14% respectively, the amount of urea in the extruded urea bearing product could reach up to 10%, and high product quality and productivity were also achieved
2000, Vol. 15 
