Transfer of Methionine and Lysine into the Mesenteric Blood Plasma from the Intestinal Lumen in the Chicken

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  • YOKOTA Hiro-omi
    Laboratory of Animal Nutritions, Faculty of Agriculture, Nagoya University

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  • 鶏腸管におけるメチオニンおよびリジンの吸収
  • ニワトリ チョウカン ニ オケル メチオニン オヨビ リジン ノ キュウシュウ

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Abstract

Intestinal absorption of L- and D-isomer of both methionine and lysine in chickens was investigated in situ, by measuring the disappearance and appearance rates of amino acids from lower jejunal lumen and into the mesenteric blood plasma, respectively, and also the amounts of amino acids accumulating in the intestinal tissues. The disappearance and appearance rates of L-methionine were high immediately after the introduction of the amino acid into the intestinal lumen when compared with those of the other amino acids. When D-methionine was introduced, the disappearance rate was as high as that of L-methionine at the first stage of absorption, whereas the appearance rate into the mesenteric blood was low, but 20 minutes after the introduction it became high. The disappearance rates of L- and D-lysine were low 10 minutes after the introduction and became high 20 minutes after the introduction, although the appearance rates maintained low level throughout the absorption period. The concentration of D-methionine remained in the intestinal tissues was high at 10 minutes after the introduction, but became low at 20 minutes, whereas L-methionine was low throughout the absorption period. The concentration of lysine remained in the intestinal tissues maintained the higher level than that of L-methionine throughout the absorption period. From the results, it is assumed that there are two carriers concerning amino acid absorption from the intestine of chickens; one carrier works for transportation of amino acid from the intestinal lumen into the intestinal tissues, and another from the intestinal tissues into the mesenteric blood.

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