Amino Acids in Dog Blood and Gut Contents after Feeding Zein

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Abstract
Two hours after feeding zein the animals were anesthetized and the abdomen opened. Blood was drawn simultaneously from the carotid artery and mesenteric, portal and jugular veins. Contents were removed from the portion of jejunum drained by the intubated mesenteric vein. Amino acid concentrations increased above fasting values but generally the increases were greatest in the mesenteric vein. Molar ratios of amino acids in zein were different from both gut contents and blood plasma. Lysine and tryptophan, which are virtually absent from zein, were present in gut contents and there was no depression of concentration of these two amino acids in mesenteric blood.