| Variables | Levels of concentrate in the diet (%) | P > F | ||||
| 20 | 40 | 60 | 80 | L1 | Q2 | |
| Protein profile | ||||||
| Urea (mmol/L) | 7.01 | 5.58 | 7.09 | 7.64 | ns | ns |
| Creatinine (µmol/L) | 128.27 | 143.42 | 126.89 | 122.77 | ns | ns |
| Ur:Cr* | 0.06 | 0.04 | 0.06 | 0.06 | ns | 0.0466 |
| Total Protein (g/L) | 59.56 | 61.76 | 62.49 | 66.18 | 0.0178 | ns |
| Albumin (g/L) | 21.90 | 23.54 | 24.56 | 25.56 | 0.0136 | ns |
| Globulin (g/L) | 37.66 | 38.22 | 37.94 | 40.62 | ns | ns |
| A:G* | 0.58 | 0.62 | 0.65 | 0.63 | ns | ns |
| Enzymatic activity | ||||||
| Aspartate Transaminase (U/L) | 140.94 | 129.41 | 137.87 | 128.88 | ns | ns |
| Gamma glutamyltransferase (U/L) | 16.68 | 23.71 | 23.48 | 16.17 | ns | 0.0117 |
| Alanine aminotransferase (U/L) | 42.87 | 36.79 | 34.84 | 38.78 | ns | ns |
| Alkaline Phosphatase (U/L) | 258.00 | 193.25 | 223.98 | 172.49 | ns | ns |