ABSTRACT—The effect of triglycylvasopressin (TGVP) on the absorption of chenodeoxycholic acid (CDCA) was investigated in three groups of six rats (controls, CDCA, CDCA + TGVP) through the evaluation of portal and caval serum bile acids (SBA) concentrations after an oral load with CDCA to investigate whether changes in this parameter reflect variations in splanchnic blood flow induced by a vasoconstrictor. The results indicate that CDCA was absorbed and led to a significant increase in SBA. This increase was reduced by TGVP administration: portal blood 380.0 ± 61.2 vs 279.7 ± 45.3; caval blood 151.8 ± 45.7 vs 41.7 ± 12.5 (μmol/1; mean ± s.d.). This suggests that variations in SBA concentrations could reflect changes in splanchnic circ