Three experiments were conducted to evaluate the feeding value of
processed soybean (SB) products fed to pigs. The first objective of experiment 1 was to
measure the apparent (AID) and standardized (SID) of CP and AA in a high protein SB
fed to growing pigs. Values obtained were compared to the AID and SID of CP and AA
in conventional SB, conventional soybean meal (SBM) and soy protein concentrate
(SPC). Four cornstarch based diets were formulated using each soy product as the only
source of CP and AA in the diet. The second objective was to measure the effect of
adding oil on amino acid digestibility of SBM and SPC. Two additional diets were
formulated by adding 7.55 and 7.35% oil to SBM and SPC, respectively. A N-free diet
was used to measure the basal endogenous losses of CP and AA. The AID and SID of
CP and AA in the high protein SB were not different from conventional SB and the SID
of most AA in the high protein SB was similar to SBM with oil and SPC. The addition of
oil improved the SID of most AA in SBM and SPC