Wheat, Sorghum, and Raw Soybeans as Alternative Energy and Protein Sources for Growina-Finishina Pigs

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© 1995 American Registry of Professional Animal Scientists. Four hundred fifty-six crossbred pigs were used in two experiments (Exp.) with two trials each. In Exp. 1, 240 pigs were allotted to six treatments with four replications of 5 pigs per replicate in each trial. In Exp. 2, 120 (Trial 1) or 96 (Trial 2) pigs were allotted to six treatments with four replications of 5 (Trial 1) or 4 (Trial 2) pigs per replicate. The six treatment diets used in Exp. 1 were: 1) corn-soybean meal (C-SBM); 2) C-SBM to 59 kg, corn-raw soybeans (C-RSB) from 59 to 105 kg; 3) 1:1 corn:wheat and SBM (CW-SBM); 4) CW-SBM to 59 kg, CW-RSB from 59 to 105 kg; 5) wheat-SBM (W-SBM); 6) W-SBM to 59 kg, WRSB from 59 to 105 kg. In Exp. 2, corn and sorghum were used instead of corn and wheat. A grower diet formulated to provide .82% lysine was fed until 59 kg BW, and a finisher diet formulated to provide .67% lysine was fed until market weight. Wheat decreased (P<.08) ADG and ADFI during the growing period; wheat quadratically affected (initial increase and then a decrease, P<.08) ADG during the finishing and the combined growing-finishing periods. Sorghum did not affect (P>.10) growth performance during the growing period, or ADG and gain:feed during the finishing or combined growing-finishing periods. However, sorghum increased (P<.01) ADFI during the growing and growing-finishing periods. In both Exp., RSB decreased (P<.10) ADG, ADFI, and gain:feed. A sorghum linear × RSB interaction (P<.05) was observed for ADFI; ADFI was increased in pigs fed SBM and increasing levels of sorghum, but ADFI was not affected in pigs fed RSB and sorghum. The inclusion of RSB in the diet increased (P<.04) average backfat thickness (Exp. 2) and iodine number of the fat in both experiments. Corn can be replaced by wheat or sorghum in growing-finishing pig diets, whereas the use of RSB, regardless of grain source, is not recommended for maximum pig performance.

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Professional Animal Scientist

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