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Effects of Extrusion Condition of Barley on the Growth and Nutrient Utilization in Growing Pigs |
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X. S. Piao, B. J. Chae, J. H. Kim, J. Jin, W. T. Cho, In K. Han |
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| Abstract |
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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 (Landrace횞Duroc횞Large 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 ingrediet. The treatments were 1) no extrusion (Control); 2) extrusion at 100째C without preconditioning (ENLT); 3) extrusion at 150째C without preconditioning (ENHT); 4) extrusion at 100째C with preconditioning (ECLT); 5) extrusion at 150째C with preconditioning (ECHT). Temperature in the barrel was controlled within 5째C by feed rate with the addition of water at the rate of 3l 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 150째C than at 100째C. 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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