Items | FMS kg/d of dry mater | SEM | P-value | |||
---|---|---|---|---|---|---|
0 | 0.2 | 0.4 | 0.6 | |||
Nitrogen utilization (g/d) | ||||||
 Intake | 34.81 ± 1.23a | 41.02 ± 1.54b | 44.03 ± 1.98c | 48.01 ± 2.12d | 2.79 | 0.001 |
N excretion (g/d) | ||||||
 Fecal N | 15.20 ± 2.32 | 16.00 ± 1.98 | 16.20 ± 1.67 | 13.90 ± 1.59 | 0.52 | 0.54 |
 Urinal N | 13.00 ± 1.41 | 13.40 ± 1.50 | 11.80 ± 1.83 | 10.50 ± 1.92 | 0.65 | 0.25 |
N balance (g/d) | ||||||
 Absorbed N | 19.61 ± 1.04a | 25.02 ± 1.67b | 28.01 ± 1.91b | 34.10 ± 1.98c | 3.02 | 0.001 |
 Retained N | 6.70 ± 0.54a | 11.61 ± 0.946b | 17.63 ± 1.32c | 22.30 ± 1.27d | 3.41 | 0.001 |
Allantoin (mM/d) | 108.92 ± 3.54a | 122.61 ± 4.21b | 130.67 ± 5.33b | 148.71 ± 8.12c | 8.30 | 0.001 |
Uric acid (mM/d) | 26.11 ± 1.34a | 29.42 ± 2.30b | 31.33 ± 1.11b | 35.56 ± 1.72c | 1.99 | 0.001 |
PD (mM/d) | 130.67 ± 3.43a | 147.22 ± 2.31b | 156.78 ± 3.16b | 178.43 ± 2.81c | 9.96 | 0.001 |
Purine absorb (mM/d) | 109.3 ± 2.43a | 125.7 ± 2.56b | 135.4 ± 2.11b | 157.0 ± 2.43c | 9.96 | 0.001 |
MNS (g N/d) | 79.41 ± 2.21a | 91.4 ± 3.11b | 98.4 ± 4.01b | 114.1 ± 4.87c | 7.24 | 0.001 |
MNS increased (%) | 0.00 ± 0.00a | 15.43 ± 1.65b | 24.12 ± 1.93b | 44.01 ± 2.88c | 9.20 | 0.002 |
EMNS (g N/kg OMDR) | 9.60 ± 0.13a | 11.31 ± 0.46b | 14.13 ± 0.72c | 14.12 ± 0.54c | 1.01 | 0.003 |
EMNS increased (%) | 0.00 ± 0.00a | 18.92 ± 1.63b | 39.78 ± 1.97b | 49.01 ± 2.41c | 10.9 | 0.001 |