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Table 3 Mean plasma concentration and urinary excretion of urea nitrogen and 3-methylhistidine (3-MH) in calves on the final day of a five day intravenous infusion of saline (control); glucose; essential amino acids (EAA) and glucose + EAA.

From: Effect of prolonged intravenous glucose and essential amino acid infusion on nitrogen balance, muscle protein degradation and ubiquitin-conjugating enzyme gene expression in calves

  Control Glucose EAA EAA+Glucose
Plasma Urea N mmol/L 8.8a ± 0.91 5.8b ± 0.37 11.0c ± 0.79 6.7ab ± 0.51
Plasma 3-MH μmol/L 3.3a ± 0.36 1.6b ± 0.24 1.9b ± 0.61 1.9b ± 0.13
Urinary Urea N g/d 16.8a ± 1.06 12.4b ± 1.19 25.3c ± 3.70 15.8ab ± 1.71
Urinary 3-MH:Creatinine mg/g 13.3a ± 0.51 12.2b ± 0.33 12.5a ± 0.24 12.2a ± 0.22
Net Nitrogen Balance g/kg/d 0.52 0.80 1.06 1.66
  1. Values are averages of 6 blood samples taken at hourly intervals during the last 6 hours of the infusion or pooled urine collected over the last 4 days of infusion. Net nitrogen balance is the difference between digested nitrogen intake (assuming a nitrogen digestibility of 0.85) and urinary nitrogen excretion. Values are means ± standard error of the mean (SEM). a,b,c Values within the same row with different superscripts are significantly different (P < 0.05).