Endogenous amino acid flow in the avian ileum: quantification using three techniques

The British Journal of Nutrition
V RavindranW L Bryden

Abstract

The aim of the present study was to compare the protein-free diet, guanidinated casein (GuC) and enzyme hydrolysed casein (EHC) methods for the quantification of endogenous amino acid (AA) flow in the avian ileum. Growing broiler chickens (5 weeks old) were used. All three assay diets were based on dextrose, and in the GuC and EHC diets GuC or EHC were the sole source of N. Endogenous AA flows determined with the use of protein-free diet were considerably lower (P<0.05) than those determined by the GuC and EHC methods. The total endogenous AA flows determined by the GuC and EHC methods were almost 3-fold greater (P<0.05) than those determined by the protein-free diet. The endogenous AA values obtained from GuC and EHC methods were similar (P>0.05), except for the flow of arginine, which was lower (P<0.05) in the EHC method. Glutamic acid, aspartic acid, threonine and glycine were the predominant endogenous AA present in digesta from the distal ileum. The contents of methionine, histidine and cystine were lower compared with other AA. The method of determination had no effect on the AA composition of endogenous protein, except for threonine, glutamic acid, lysine, arginine and cystine. The concentrations of threonine and arginin...Continue Reading

References

Apr 1, 1994·The British Journal of Nutrition·P SiriwanE F Annison
Dec 1, 1993·British Poultry Science·P SiriwanE F Annison
Jun 1, 1997·Zeitschrift für Ernährungswissenschaft·K A LienM Fenton
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Citations

Jul 30, 2008·The British Journal of Nutrition·Velmurugu RavindranDonald V Thomas
Aug 21, 2007·Poultry Science·S A AdedokunT J Applegate
Jul 14, 2007·Poultry Science·S A AdedokunT J Applegate
Feb 27, 2014·Poultry Science·P TancharoenratG Ravindran
May 13, 2011·Journal of Animal Physiology and Animal Nutrition·D JamrozT Stefaniak
Jan 7, 2010·Journal of Animal Physiology and Animal Nutrition·A F SoleimaniI Zulkifli
Jun 1, 2007·Nutrition Research Reviews·Shane M Rutherfurd, Paul J Moughan
Jan 9, 2021·Journal of Animal Science and Biotechnology·V Ravindran

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