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Swine Nutrition and Feed Technology
Asian-Australasian Journal of Animal Sciences 1995;8(2): 129-133.
DOI: https://doi.org/10.5713/ajas.1995.129    Published online April 1, 1995.
Effects of protein level and extrusion processing of soybean meal on the performance of growing pigs
I. K. Paik, J. S. Um, S. H. Lee, M. S. Chung
Abstract
A feeding trial was conducted to evaluate the effects of crude protein concentration(44% vs 48%) and extrusion processing of soybean meal(SBM) on the performance of weanling and growing pigs. One hundred and ninety two(96 pigs of each sex) 3 way crossed (Landrace 횞 Hampshire 횞 Duroc) weaned pigs were allotted to 12 pens each of 16 pigs(8 pigs of each sex). Three pens were assigned to each of the 4 treatment; T1; 44% SBM diet, T2; extruded 44% SBM diet, T3; 48% SBM diet and T4; extruded 48% SBM diet. The 44% SBM diet was formulated to have 18% CP for the starter phase(-10 wk of age) and 15% CP for the grower phase (10-15 wk of age). The other treatments used equivalent amount of each SBM, replacing the 44% SBM. Chemical assay showed that extrusion processing generally decreased amino acid content especially total lysine and available lysine. Extrusion increased Hunterlab color +a value and decreased the urease activity index. The body weight gains for the T3 and T4 pigs were significantly(p<0.05) greater than for those on T1 and T2 for the starter phase, but not the grower phase. Extrusion processing did not improve weight gain. Feed intake for the overall period was significantly(p<0.05) different among treatments. The feed conversion ratios were not significantly different among treatments. An economic analysis showed that the high protein(48%) SBM diet was more cost effective than the low protein(44%) SBM diet, for the starter phase.
Keywords: 44% SBM; 48% SBM; Dry extrusion; Pigs


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