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Utilization by Growing and Finishing Pigs of Raw Soybeans of Low Kunitz Trypsin Inhibitor Content¹

University of Illinois, Urbana 61801

Abstract

Three trials were conducted to compare acceptance and utilization by growing and finishing pigs of diets containing supplemental protein from either heated, solvent-extracted soybean meal (SBM), raw low-Kunitz trypsin inhibitor soybean (LT) or raw commercially grown Williams cultivar soybean with high Kunitz trypsin inhibitor content (HT). In Trial 1, 36 crossbred pigs, averaging 7 kg in weight, were fed 1) corn-SBM, 2) corn-LT or 3) corn-HT diets for 28 d. Diets were formulated to be isolysinic and to have similar calorie:lysine ratios. Average daily gain and gain/feed were higher (P < .01) for pigs fed the corn-SBM diet than for pigs fed the corn-LT diet; average daily gain and gain/feed were higher (P < .01) for the corn-LT diet than for the corn-HT. Average daily feed intake did not differ (P > .05) among diets. In Trial 2, 48 crossbred pigs averaging 67 kg were fed diets similar to those in Trial 1 but with lower lysine values. The daily gain (.95 kg) of pigs fed the corn-SBM diet was greater (P < .05) than for pigs fed the corn-LT diet (.87 kg), which in turn was greater (P < .05) than for the pigs fed the corn-HT diet (.83 kg). Daily feed intake (kg) and gain/feed were 3.27 and .291, 2.97 and .293, and 3.07 and .270, respectively, for pigs fed the corn-SBM, corn-LT and corn-HT diets. In Trial 3, 18 castrate male pigs averaging 12.4 kg were fed cornstarch-based diets with either SBM, LT or HT as the source of protein. Nitrogen digestibility (P < .05) and retention (P < .01) were higher for pigs fed the SBM diet than for those fed the LT diet and for pigs fed the LT diet than for those fed the HT diet. Digestible and metabolizable energy values were higher (P < .05) for pigs fed the SBM diet than for the pigs fed the LT and HT diets, the latter two being similar. The LT soybean was utilized more efficiently than the HT soybean by both growing and finishing pigs.

¹ This research supported in part by a grant from the Moorman Manufacturing Company, Quincy, IL.

² Dept. of Anim. Sci.

³ To whom reprint requests should be made.

⁴ Dept. of Agron.