PMID: 6412743Sep 1, 1983Paper

Oxidation of an indicator amino acid by young pigs receiving diets with varying levels of lysine or threonine, and an assessment of amino acid requirements

The British Journal of Nutrition
K I KimH S Bayley

Abstract

The catabolism of [14C]phenylalanine was used to indicate the effects of varying the dietary level of lysine and threonine on the retention of dietary amino acids by 2-week-old pigs receiving diets containing skim milk and a mixture of free amino acids. Reducing the dietary level of lysine from 16 to 12 g/kg had no influence on phenylalanine oxidation, reducing the lysine level from 12 to 11 then to 10 g/kg caused an almost linear increase in phenylalanine oxidation whereas further reduction to 9 or 8 g/kg resulted in a less-marked increase in phenylalanine oxidation. This showed that 12 g lysine/kg was required to maximize amino acid retention and indicated that lysine was conserved more effectively at low dietary concentrations than at dietary concentrations approaching the requirement. Reducing the dietary level of threonine from 8 to 6 g/kg had no influence on phenylalanine oxidation, whereas further reduction to 4 g/kg caused a linear increase in phenylalanine catabolism showing that 6 g threonine/kg was required to maximize amino acid retention. Reduction of the levels of lysine, threonine and methionine from the generous levels characteristic of a diet containing 240 g protein from skim milk/kg, to the requirement levels...Continue Reading

References

Aug 1, 1976·The Journal of Nutrition·S H Chu, D M Hegsted
May 1, 1975·Journal of Animal Science·D H BakerR A Easter
Nov 1, 1970·The Journal of Nutrition·A K Said, D M Hegsted
Sep 1, 1983·The British Journal of Nutrition·K I KimH S Bayley
Sep 1, 1983·The British Journal of Nutrition·K I Kim, H S Bayley
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Citations

May 1, 1986·The British Journal of Nutrition·R O Ball, H S Bayley
May 1, 1986·The British Journal of Nutrition·R O BallH S Bayley
Jul 1, 1992·The British Journal of Nutrition·P R BeckettM F Fuller
Dec 12, 2003·The British Journal of Nutrition·Xavier RollinSadasivam J Kaushik
Mar 11, 2003·Annual Review of Nutrition·Paul B Pencharz, Ronald O Ball
Apr 25, 2012·Clinical Nutrition : Official Journal of the European Society of Parenteral and Enteral Nutrition·Uma S UnniAnura V Kurpad
Sep 1, 1987·JPEN. Journal of Parenteral and Enteral Nutrition·D M Bier, V R Young
Feb 27, 2020·The British Journal of Nutrition·Matthew HarrisonDavid Allaway
Jan 22, 2008·The Journal of Nutrition·Rajavel ElangoPaul B Pencharz
Apr 1, 1993·The American Journal of Physiology·G A ZelloR O Ball
May 6, 2003·The Journal of Nutrition·Anna K ShovellerRonald O Ball
Mar 4, 2000·The American Journal of Clinical Nutrition·D C WilsonP B Pencharz
Jan 1, 1986·Comparative Biochemistry and Physiology. A, Comparative Physiology·K R Dabrowski

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