Table 2.
Effects of supplementation with different sources of nitrogen on the intake of Nellore cattle grazing low-quality forage in the dry season (g/d, unless otherwise stated).
| Supplement 1 | SEM 2 | p-Value | ||
|---|---|---|---|---|
| Item 3 | NPN | CGM | ||
| n | 8 | 8 | ||
| DM, kg/d | 2.75 | 2.61 | 0.182 | 0.910 |
| DM supplement, kg/d | 0.10 | 0.34 | 0.043 | 0.013 |
| DM forage, kg/d | 2.65 | 2.26 | 0.179 | 0.244 |
| CP, kg/d | 0.43 | 0.34 | 0.034 | 0.516 |
| Essential amino acids (EAA) | ||||
| Arginine | 5.95 | 12.1 | 1.749 | 0.019 |
| Histidine | 2.73 | 7.27 | 1.161 | 0.015 |
| Isoleucine | 6.14 | 14.4 | 2.291 | 0.019 |
| Leucine | 14.3 | 48.8 | 8.466 | 0.015 |
| Lysine | 6.40 | 9.90 | 1.287 | 0.035 |
| Methionine | 1.27 | 5.54 | 1.050 | 0.016 |
| Phenylalanine | 6.95 | 19.2 | 3.127 | 0.016 |
| Threonine | 6.96 | 13.6 | 1.991 | 0.023 |
| Valine | 7.95 | 17.2 | 2.614 | 0.020 |
| Non-essential AA (NEAA) | ||||
| Alanine | 11.2 | 29.5 | 4.813 | 0.017 |
| Aspartic Acid | 14.7 | 29.3 | 4.555 | 0.028 |
| Cystine | 1.44 | 5.11 | 0.855 | 0.013 |
| Glutamic Acid | 22.8 | 71.7 | 12.33 | 0.016 |
| Glycine | 7.90 | 12.9 | 1.749 | 0.032 |
| Proline | 11.3 | 30.5 | 4.654 | 0.013 |
| Serine | 8.63 | 20.2 | 3.180 | 0.019 |
| Tyrosine | 4.34 | 14.9 | 2.589 | 0.014 |
| AA total | 141 | 362 | 58.33 | 0.017 |
| EAA | 58.7 | 148 | 23.68 | 0.018 |
| NEAA | 82.4 | 214 | 34.64 | 0.017 |
1 NPN = Supplementation of urea as a source of NPN (50% of the daily requirement of RDP); CGM = supplementation of corn gluten meal 60 as the source of RUP (3 g/kg of BW per day). 2 SEM = standard error of the mean. 3 DM = dry matter; CP = crude protein.