Effect of presolvent extraction processing method on the nutritional valueof soybean meal for chicks

This study evaluated the effect of extruding or expander processing prior t o solvent extraction on the nutritional value of soybean meal (SBM). Three samples of SBM containing 100% nonexpander SBM, 100% expander SBM, or a mix ture of nonexpander and expander SBM were obtained from a commercial plant. An experiment was conducted using Peterson x Hubbard commercial male broil er chicks fed 20% CP corn-SBM-corn gluten meal diets from 8 to 21 d of age. The experiment had a 3 x 2 x 2 factorial design, with three SBM types, two levels of Met + Cys (0.77 and 0.90%), and two levels of Lys (0.95 and 1.20 %). Processing method had no effect on the amino acid concentration or prot ein solubility of the SBM. Dietary treatment had no significant effect on c hick weight gain or feed intake. Feed efficiency was significantly improved (P < 0.05) by Met and Lys supplementation, but SBM processing method had n o significant effect. The results of this study indicate that presolvent pr ocessing method (expander or nonexpander) had no significant effect on the nutritional value of SBM for broiler chicks.