Table 1 Ingredients and chemical composition of the diets (DM basis)
Items | Treatment1 | ||
|---|---|---|---|
Control | UN | UNCO | |
Ingredients, g/kg | |||
 Untreated rice straw2 | 500 | – | – |
 Urea plus nitrate pretreated rice straw3 | – | 500 | 500 |
 Soybean meal4 | 80.0 | 80.0 | 65.0 |
 Corn grain | 292 | 292 | 277 |
 Wheat bran | 98.0 | 98.0 | 98.0 |
 CaCO3 | 1.00 | 1.00 | 1.00 |
 CaH2PO4 | 4.00 | 4.00 | 4.00 |
 NaCl | 5.00 | 5.00 | 5.00 |
 Premix | 20.0 | 20.0 | 20.0 |
 Corn oil5 | – | – | 30.0 |
Chemical composition, g/kg | |||
 OM | 910 | 910 | 921 |
 CP | 105 | 121 | 119 |
 NDF | 468 | 458 | 440 |
 ADF | 271 | 266 | 257 |
 GE, MJ/kg | 16.2 | 16.3 | 16.3 |
 EE | 10.2 | 10.2 | 40.2 |
 Nitrate | – | 2.33 | 2.33 |