LAUSR

Abstract Two experiments were conducted to determine the effects of sorghum kafirins and tannins concentrations on the apparent and standardized ileal digestibility (AID and SID, respectively) of protein, amino acids, and starch; as well as on the glucose and plasma urea nitrogen (PUN) response in growing pigs. Two hybrids of sorghum, 82G93 and 81G67 that were low and high in tannins (LT and HT), respectively, were evaluated. Each hybrid had low or high levels of kafirins (LK and HK, respectively). Pigs were fed 4 experimental diets that were formulated with sorghum as the sole source of CP and AAs: LT-LK, LT-HK, HT-LK, and HT-HK. In experiment 1, ileal cannulation was performed in 4 pigs weighing 25 ± 0.60 kg to determine protein, amino acids, and starch digestibility. In experiment 2, internal jugular venous catheterization was performed in 4 pigs weighing 26 ± 0.52 kg to determine glucose and PUN response. Experiment 1 results revealed that starch digestibility was not affected (P > 0.05) by kafirins neither tannins. Kafirins levels negatively affected (P   0.05) by kafirins but was reduced (P