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Effects of Extrusion Condition of Barley on the Growth and Nutrient Utilization in Growing Pigs

  • Piao, X.S. (Institute of Animal Science & Technology, College of Agriculture & Life Sciences Seoul National University) ;
  • Chae, B.J. (Dept. of Animal Science, Kangwon National University) ;
  • Kim, J.H. (Institute of Animal Science & Technology, College of Agriculture & Life Sciences Seoul National University) ;
  • Jin, J. (Institute of Animal Science & Technology, College of Agriculture & Life Sciences Seoul National University) ;
  • Cho, W.T. (Institute of Animal Science & Technology, College of Agriculture & Life Sciences Seoul National University) ;
  • Han, In K. (Institute of Animal Science & Technology, College of Agriculture & Life Sciences Seoul National University)
  • Received : 1998.08.13
  • Accepted : 1998.10.28
  • Published : 1999.08.01

Abstract

To study the effects of different extrusion conditions of barley on growth performance, nutrient digestibility and nutrient excretion in feces, a total of 150 growing pigs ($Landrace{\times}Duroc{\times}Large$ White; average 24.4 kg body weight) were allotted to five treatments, in a completely randomized block design. The experimental diets were based on corn-soybean and 30% of barley was included in each diet; barley was the only extruded ingredient. The treatments were 1) no extrusion (Control); 2) extrusion at $100^{\circ}C$ without preconditioning (ENLT); 3) extrusion at $150^{\circ}C$ without preconditioning (ENHT); 4) extrusion at $100^{\circ}C$ with preconditioning (ECLT); 5) extrusion at $150^{\circ}C$ with preconditioning (ECHT). Temperature in the barrel was controlled within ${\pm}5^{\circ}C$ by feed rate with the addition of water at the rate of $3{\ell}\;per\;min$. in the extruder for each treatment. For the 6 week experimental period, extrusion of barley improved the average daily gain (ADG) and digestibilities of dry matter, crude protein and gross energy in growing pigs. As compared to control, significant improvements in ADG (p<0.05) were shown in the groups of feeding extruded barley at high temperature (ENHT and ECHT). There were also significant differences in the digestibilities of DM, CP and P between extrusion temperatures. Barley extruded at high temperature gave better digestibilities of DM, CP and GE than barley extruded at low temperature. Extruded barley diet groups showed significantly (p<0.05) lower excretions of DM, nitrogen (N) and P per kg gain as compared to the ground barley group. DM, N and P excretion per kg gain were also significantly lower in pigs fed barley extruded at $150^{\circ}C$ than at $100^{\circ}C$. In conclusion, extrusion considerably improved the nutritive value of barley and it appeared that temperature is the most important variable.

Keywords

Extrusion Conditioning;Barley;Growth Performance;Nutrient Digestibility;Growing Pigs

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