The effects of added sulphur amino acids, threonine and an ideal amino acid ratio on nitrogen metabolism in mature, overweight dogs

Robin E. Bohaty, Maria Regina Cattai de Godoy, Kyle R. McLeod, David L. Harmon

Research output: Contribution to journalArticlepeer-review

Abstract

The objectives of this study were to investigate the effects of added essential amino acids in conjunction with a dietary lysine/MJ of 0.72 on nitrogen (N) metabolism in dogs. Treatments were; a control diet, a diet that provided an ideal amino acid profile (IAA), a diet with added total sulphur amino acids (TSAA), and a diet with added TSAA and threonine (TT). Diets were fed to eight overweight, mature, female hounds using a replicated 4 × 4 Latin Square design. Food intake was similar across treatments, however, food N intake was higher (p < 0.001) for TSAA than control, IAA or TT. Nitrogen absorbed was higher (p < 0.01) for TSAA than IAA and control. Urea N excretion was greater for control than TT (p < 0.05). Urine N excretion did not differ between diets. There were no differences in digestibility or N retention of diets. There were no differences in protein turnover, synthesis, or degradation. Blood metabolites were within normal ranges and did not differ due to dietary treatment. Based on the measurements made in this study, there is no benefit for added TSAA, TT or additional EAA in diets for mature dogs formulated to provide a 0.72 g lysine/MJ ME ratio.

Original languageEnglish (US)
Pages (from-to)39-49
Number of pages11
JournalArchives of Animal Nutrition
Volume66
Issue number1
DOIs
StatePublished - Feb 1 2012
Externally publishedYes

Keywords

  • amino acids
  • digestibility
  • dogs
  • nitrogen balance
  • protein turnover

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

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