Effect of soybean variety and processing of growth performance of young pigs
University of Illinois researchers evaluated the effects of lectin and Kuntiz trypsin inhibitor on growth performance of young pigs. A commercial soybean variety (Williams 82) was used to develop isolines that are genetically void of lectin or void of lectin and the Kuntiz trypsin inhibitor. The swine feeding study consisted of 140 pigs weighting 13.89 kg allotted to seven treatments with 5 reps/diet and 4 pigs/pen. The seven treatments were a solvent extracted soybean meal control and each soybean line fed raw or extruded in the corn-based ration. The rations were formulated to contain equal levels of lysine (1.01%) and digestible energy (3600 DE/kg). The results of the 28-day experiment found the similar performance among pigs fed the SBM or the extruded soybean treatments. Performance of the pigs fed the SBM or extruded soybean treatments were significantly (P<0.05) better than the pigs fed the raw soybean treatments. The results of this study show that 21 percent of the growth repression caused by feed the diet containing raw Williams 82 soybeans was restored by feeding the lectin-free soybeans and 55 percent of the growth depression restored by the lectin and Kuntiz trypsin free soybean treatment. These results indicate that soybeans can be developed without two of the anti-nutritional factors contained in commercial soybean lines. These genetically modified lines would have greatest value when raw soybeans included in swine rations. The lectin and Kuntiz trypsin free soybean lines must be heat-treated To obtain maximum pig performance.
Easter, R.A., T. Hymowitz, K.T. Soltwedel and J.E. Pettigrew. 2002. Effect of soybean variety and processing of growth performance of young pigs. J. Animal Sci. 80:Suppl. 1, Abstract #640.