Table 1.
Chemical composition of the experimental forage and supplements.
| Supplement | |||
|---|---|---|---|
| Item | Forage 1 | NPN | CGM |
| Chemical composition 2, % of DM | |||
| DM, % | 75.6 | 93.9 | 91.2 |
| OM | 94.1 | 99.7 | 97.4 |
| NDF | 70.4 | - | 7.98 |
| ADF | 37.1 | - | 2.22 |
| iNDF | 30.3 | - | 1.71 |
| NFC | 16.8 | - | 28.9 |
| EE | 1.29 | - | 1.71 |
| CP | 5.51 | 275 | 58.7 |
| RDP 3, % of CP | 63.3 | 100 | 30.3 |
| RUP 3, % of CP | 36.7 | - | 69.7 |
| Essential amino acids (EAA), % of DM | |||
| Arginine | 0.16 | - | 2.17 |
| Histidine | 0.06 | - | 1.49 |
| Isoleucine | 0.15 | - | 2.82 |
| Leucine | 0.29 | - | 10.9 |
| Lysine | 0.19 | - | 1.41 |
| Methionine | 0.02 | - | 1.32 |
| Phenylalanine | 0.16 | - | 3.98 |
| Threonine | 0.18 | - | 2.40 |
| Valine | 0.21 | - | 3.19 |
| Non-essential AA (NEAA), % of DM | |||
| Alanine | 0.27 | - | 6.03 |
| Aspartic Acid | 0.39 | - | 5.33 |
| Cystine | 0.03 | - | 1.14 |
| Glutamic Acid | 0.47 | - | 15.7 |
| Glycine | 0.23 | - | 1.95 |
| Proline | 0.28 | - | 6.21 |
| Serine | 0.21 | - | 3.95 |
| Tyrosine | 0.08 | - | 3.37 |
1 Forage Urochloa brizantha cv. Xaraés; 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 DM = dry matter; OM = organic matter; NDF = neutral detergent fiber assayed with a heat stable amylase and expressed exclusive of residual ash; ADF = acid detergent fiber; iNDF = indigestible NDF; NFC = non-fiber carbohydrates; EE = ether extract; CP = crude protein; RDP = rumen degradable protein; and RUP = rumen undegradable protein; 3 RDP and RUP content were estimated based on the protein fractions [23] and the degradation rate of each fraction, considering a passage rate of 3% h−1.