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Intestinal lysine metabolism is driven by the enteral availability of dietary lysine in piglets fed a bolus meal

¹Department of Nutrition Physiology and Feeding Control, National Institute for Agricultural Research, Unité Mixte de Recherche, Institut National de la Recherche Agronomique-National Institute for Agricultural Sciences of Paris, 75231 Paris, France; ²United States Department of Agriculture, Agricultural Research Service, Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030; and ³Department of Animal Sciences, University of Illinois, Urbana, Illinois 61801

Submitted 7 April 2003 ; accepted in final form 7 July 2003

Previous steady-state continuous-feeding studies have shown that the gut mucosa removes substantial amounts of both dietary and systemic amino acids. However, enteral nutrition is often given under non-steady-state conditions as a bolus meal, and this has been shown to influence systemic metabolism. Therefore, our aim was to quantify the relative metabolism of dietary and systemic lysine by the portal-drained viscera (PDV) under non-steady-state conditions after a single bolus meal. Five 28-day-old piglets implanted with arterial, venous, and portal catheters and with an ultrasonic portal flow probe were given an oral bolus feeding of a milk formula containing a trace quantity of intrinsically ¹⁵N-labeled soy protein and a continuous intravenous infusion of [U-¹³C]lysine for 8 h. Total lysine use by the PDV was maximal 1 h after the meal (891 µmol·kg^–1·h^–1) and was predominantly of dietary origin (89%), paralleling the enteral delivery of dietary lysine. Intestinal lysine use returned to a low level after 4 h postprandially and was derived exclusively from the arterial supply until 8 h. Cumulative systemic appearance of dietary lysine reached 44 and 80% of the ingested amount 4 and 8 h after the meal, respectively, whereas the PDV first-pass use of dietary lysine was 55 and 32% of the intake for these two periods, respectively. We conclude that the first-pass utilization rate of dietary lysine by the PDV is directly increased by the enteral lysine availability and that it is higher with a bolus than with continuous oral feeding.

amino acid metabolism; dietary amino acids; portal-drained viscera; nonsteady state

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