Effect of soybean variety and processing on growth performance of pigs

The presence of protease inhibitors prohibits utilization of the raw beans for food and feed. As a result of soybean breeding program at Maize Research Institute Zemun Polje, two cultivars with reduced amount of anti nutritional factors (Kunitz trypsin inhibitor-free cultivars) are developed. Feeding trials were conducted to compare the response of growing and finishing pigs to diets based on different soybean varieties processed in various ways. Feed mixtures were formulated to contain: 20% grits made by extrusion of standard grain quality soybean, 20% grits of extruded grain of Kunitz-free soybean cultivar, 20% row Kunitz-free soybean cultivar. The greatest improvement in growth performance, as indicated by average daily weight gain (DWG) and feed conversion ratio, was noted for the group fed extruded Kunitz-free soybean. Average DWG for this group was by 7.42% and 6.47% higher than for those fed mixture with raw KTI-free and extruded standard cultivar, respectfully.