Portal Absorption and Hepatic Uptake of Amino Acids in Rainbow Trout Force-Fed Complete Diets Containing Casein or Crystalline Amino Acids
Takeshi MuraiHiroshi OgataYasuhiro HirasawaToshio AkiyamaTakeshi Nose
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Volume 53 (1987) Issue 10 Pages 1847-1859

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In order to study the dynamics of amino acid metabolism in rainbow trout, blood samples were collected from the hepatic vein, hepatic portal vein and caudal vein-artery complex at 0, 3, 6, 12, 24, 48 and 72h after force-feeding complete diets containing casein or corresponding crystal-line amino acids. In both dietary groups, a large proportion of free amino acids appeared in the portal blood within 3h and their level reached peaks by 12h at the latest and dropped to fasting levels by 24h. Most of the amino acids, including branched-chain amino acids, were taken up by the liver intensively during the absarptive period and less intensively but significantly even at 72h after food intake. Patterns of the portal absorption of and hepatic uptake of essential amino acids reflected the dietary profiles in both groups during the absorptive period. Postprandial changes in plasma free amino acids collected from all three regions showed similar patterns in both dietary groups.

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