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This study was designed to investigate the existence of an ileal brake mechanism in the pig model. The test substances used (oleic acid, deoxycholic acid, taurocholic acid) had all been previously shown to affect the ileal brake mechanism in other species including man. The substances were infused directly into the terminal ileum of surgically modified pigs, 45 min after the pigs had ingested a meal containing a drug marker. The marker used was sulfasalazine, which is cleaved to form a metabolite, sulfapyridine, when it reaches the colon. The subsequent HPLC analysis of collected blood samples allowed the appearance of sulfapyridine in the plasma and hence the arrival of sulfasalazine in the colon to be determined. Any differences in transit between control and test could be evaluated from a profile of plasma concentrations and corresponding values of AUC. The findings from this study show that the various substances did not affect transit of a test meal in the pig and suggest that it is not possible to use this pig model to make predictions about the human ileal brake.