Table 1.
Chemical composition of the diets and ingredients proportion
| Item | Dietary CP (g/kg DM) | ||
|---|---|---|---|
| 100 | 120 | 140 | |
| Ingredient, g/kg DM | |||
| CS | 500 | 500 | 500 |
| Corn grain | 397 | 396 | 396 |
| Wheat meal | 60 | 30 | 0 |
| Soybean meal / U+AS1 | 22 | 53 | 83 |
| Sodium chloride | 5 | 5 | 5 |
| Mineral mixture2 | 5 | 5 | 5 |
| Sodium bicarbonate | 8 | 8 | 8 |
| Magnesium oxide | 3 | 3 | 3 |
| Chemical composition, g/kg DM | |||
| OM | 954 | 949 | 944 |
| CP | 99 | 121 | 142 |
| Ether extract | 40 | 40 | 40 |
| apNDF | 314 | 307 | 299 |
| NFC | 507 | 494 | 482 |
| RDP, g/kg CP3 | 668 | 696 | 716 |
1U + AS = urea + ammonia sulfate; 83.3% of soybean meal and 16.7% of urea + ammonia sulfate.
2Mineral mixture = 223 g/kg calcium; 174 g/kg phosphorus; 24 g/kg sulfur; 100 mg/kg cobalt; 1,250.0 mg/kg copper; 1,795.0 mg/kg iron; 90 mg/kg iodine; 2,000.0 mg/kg manganese; 15.00 mg/kg selenium; 5,270.00 mg/kg zinc and 1,740.00 mg/kg fluor.
3RDP = calculated based on the Brazilian Feed Composition Tables for Ruminants (Valadares Filho et al., 2017), considering Kp = 0.05.