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Effects of Soybeans of Different Trypsin-Inhibitor Activities on Performance of Growing Swine¹

Illinois Agricultural Experiment Station, Urbana 61801

Abstract

Five trials using 68 growing pigs (38 gilts and 30 barrows) were conducted to evaluate the nutritional value of soybean varieties 661 (designate of a trypsin-inhibitor variant soybean), Clark and Harosoy. The effects of methionine addition and sex of animal on utilization of the soybean proteins were studied. Solvent-extracted, heated soybean meal (H-SBM), used as a standard, produced superior performance when compared to raw soybeans for both barrows and gilts. Gilts had greater gain and higher feed intake on the raw 661 diet than on the raw Clark and raw Harosoy diets, and retained more nitrogen from 661 than from Harosoy. However, barrows had a lower percent nitrogen retained from 661 than from Clark and Harosoy. Barrows and gilts had similar nitrogen retention from 661, but barrows had higher values than gilts from Harosoy. It is suggested that young gilts are more sensitive than young barrows to the trypsin-inhibitor activity. Raw 661 plus DL-methionine (0.3%) did not support performance equal to H-SBM without added methionine. Sources of protein had no effect on the dry pancreas weights.

¹ This research supported in part by funds from the Illinois Agricultural Experiment Station.

² Members of the Animal Science Department.

³ Department of Agronomy.