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Raw Soybeans for Growing-Finishing Pigs^1,2,

University of Nebraska North Platte Station, North Platte 69101

Abstract

Two hundred sixteen crossbred, growing-finishing pigs were randomly allotted to three weight groups to determine the effect of feeding raw soybeans on pig performance. The three pig weight groups initially weighed approximately 23, 45 or 68 kg. Within each weight group were four replications of three dietary treatments with six pigs/pen. Pigs within each weight group were randomly assigned and ad libitum fed three dietary treatments. Treatment 1 (control diet) consisted of a balanced corn-soybean meal (SBM) diet. Treatment 2 was the same as treatment 1 except ground raw soy-beans replaced SBM on an equal weight basis (EWB). In treatment 3, ground raw soybeans (RSB) were used in place of SBM and the diet was formulated to be isonitrogenous (ISO) with treatment 1. The dietary treatments were formulated to contain three levels of protein, depending on pig weight. Pigs weighing 23 to 45, 45 to 68 and 68 to 95 kg were fed dietary treatments formulated to contain 17, 15 and 13% crude protein, respectively. Each replication was terminated when the pigs fed the control diet averaged approximately 95 kg as determined at 14-d weigh intervals. For each weight group, average daily gain (ADG) and feed/gain (F/G) for the pigs fed diets 1, 2 and 3 were: (23 kg) .74, .37, .37 kg and 3.23, 4.47, 4.70; (45 kg) .88, .52, .57 kg and 3.56, 4.94, 4.65; (68 kg) .83, .60, .56 kg and 4.05, 5.03, 5.25, respectively. The RSB reduced ADG and F/G (P<.01) of the pigs in this study. Performance of pigs in the 2 3-kg weight group that had previously been fed diets supplemented with RSB for 98 d, significantly improved when fed the control diet for 14 d.

¹ Published as Paper No. 7496, Journal Series, Nebraska Agr. Exp. Sta.

² The authors express appreciation to Marie Allen for her assistance in preparation of the manuscript. Acknowledgement is made to J. D. Crenshaw and M. E. England for statistical assistance. The contributions of T. F. Deatrich, J. J. Ford, D. Knoll, L. Kyne, J. J. Sauder, L. Solomon and M. C. Still are gratefully acknowledged.