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Effect of Intraduodenal Starch Infusion on Net Portal Absorption of Amino Acids in Growing steers Fed Lucerne

Published online by Cambridge University Press:  21 November 2017

C.J. Seal
Affiliation:
Dept of Biological and Nutritional Sciences, University of Newcastle, Newcastle upon Tyne, NE1 7RU
D.S. Parker
Affiliation:
Dept of Biological and Nutritional Sciences, University of Newcastle, Newcastle upon Tyne, NE1 7RU
J.C. MacRae
Affiliation:
Rowett Research Institute Bucksburn Aberdeen AB2 9SB
G.E. Lobley
Affiliation:
Rowett Research Institute Bucksburn Aberdeen AB2 9SB
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Extract

Amino acid requirements for energy metabolism and protein turnover within the gastrointestinal tract are substantial and may be met from luminal and arterial pools of amino acids. Several studies have demonstrated that the quantity of amino acids appearing in the portal blood does not balance apparent disappearance from the intestinal lumen and that changing diet or the availability of energy-yielding substrates to the gut tissues may influence the uptake of amino acids into the portal blood (Seal & Reynolds, 1993). For example, increased net absorption of amino acids was observed in animals receiving exogenous intraruminal propionate (Seal & Parker, 1991) and this was accompanied by changes in glucose utilisation by the gut tissues. In contrast, there was no apparent change in net uptake of [l-13C]-leucine into the portal vein of sheep receiving short term intraduodenal infusions of glucose (Piccioli Cappelli et al, 1993). This experiment was designed to further investigate the effects on amino acid absorption of changing glucose availability to the gut with short term (seven hours) or prolonged (three days) exposure to starch infused directly into the duodenum.

Type
Nutrient Metabolism
Copyright
Copyright © The British Society of Animal Production 1994

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References

Piccioli Cappelli, F., Seal, C.J. & Parker, D.S. (1993). Proc. Nutr. Soc. 52, 192A (Abstr)Google Scholar
Seal, C.J. & Parker, D.S. (1991). Proceedings of the EAAP 6th International Symposium on Protein Metabolism and Nutrition. Herning. Denmark, pp 184–186 Google Scholar
Seal, C.J., Parker, D.S. & Avery, P.J. (1992). Br. J. Nutr. 67, 355–370 CrossRefGoogle Scholar
Seal, C.J., Parker, D.S. & Lobley, G.E. (1993). J. Anim. Sci. 71 (Suppl 1). 279 (Abstr)Google Scholar
Seal, C.J. & Reynolds, C.K. (1993). Nutr. Res. Rev. 6Google Scholar

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Effect of Intraduodenal Starch Infusion on Net Portal Absorption of Amino Acids in Growing steers Fed Lucerne
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