Alternative Processing Effects on Nutritional Value of Soybean Meal
A study was conducted comparing the effects of extruding or expander processing prior to solvent extraction on the nutritional value of soybean meal. Male broiler chicks were fed a twenty percent crude protein corn-soybean meal-corn gluten meal diet from 8-21 days of age. The experiment has a 3x2x2 factorial design, with three soybean meal types (100% nonexpander soybean meal), 100% expander meal and a mixture of nonexpander and expander meal obtained from a commercial processing plant); two levels of methionine and cystine (0.77 and 0.90%); and two levels of lysine (0.95 and 1.20%). Soybean meal processing method had no effect on the amino acid concentration or protein solubility of the meal. The feeding study results indicated that dietary treatment has no significant effect on chick weight or feed intake. Feed efficiency was significantly improved (P<0.05) by methionine and lysine additions, however soybean meal processing method had no significant effect. The researchers concluded that expanding or extruding of conditioned flakes prior to solvent extraction has no significant effect on the nutritional value of soybean meal for broiler chicks.
Douglas, M.W. and C.M. Parsons. 2000. Effects of presolvent extraction processing method on the nutritional value of soybean meal for chicks. Poultry Sci. 79(11):1623-1626.
