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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. |
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| Control |
Glucose |
EAA |
EAA+Glucose |
|
|
|
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| 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 |
|
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). | ||||
Sadiq et al. Nutrition & Metabolism 2008 5:5 doi:10.1186/1743-7075-5-5 |
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