Effect of nonessential amino acids on nitrogen retention in growing pigs fed on a protein-free diet supplemented with sulphur amino acids, threonine and tryptophan

Two N balance experiments were conducted on growing pigs to study the effect of essential and nonessential amino acids added to a protein‐free diet on N retention. In Expt. 1, the addition of sulphur amino acids, threonine and tryptophan to a protein‐free diet at levels two times the maintenance req...

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Bibliographic Details
Published in:Journal of animal physiology and animal nutrition 2001-10, Vol.85 (9-10), p.325-332
Main Authors: Křížová, L., Šimeček, K., Heger, J., Van Cauwenberghe, S.
Format: Article
Language:English
Subjects:
Amino Acids - metabolism
Amino Acids - physiology
Amino Acids, Sulfur - administration & dosage
Amino Acids, Sulfur - metabolism
Animals
Diet, Protein-Restricted - veterinary
Female
Male
Nitrogen - metabolism
Nutritional Requirements
Swine - growth & development
Swine - metabolism
Threonine - administration & dosage
Threonine - metabolism
Tryptophan - administration & dosage
Tryptophan - metabolism
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Summary:Two N balance experiments were conducted on growing pigs to study the effect of essential and nonessential amino acids added to a protein‐free diet on N retention. In Expt. 1, the addition of sulphur amino acids, threonine and tryptophan to a protein‐free diet at levels two times the maintenance requirements reduced (p > 0.1) daily N loss from –131 to –108 mg/kg0.75. A further addition of nonessential amino acids equivalent to 250 mg N/kg0.75/d resulted in a marked increase (p 
ISSN:0931-2439
1439-0396
DOI:10.1046/j.1439-0396.2001.00321.x