Table 1.
Ingredients and nutrient compositions of the experimental diets.
| Item | Diet 1 | ||
|---|---|---|---|
| LE | ME | HE | |
| Ingredient, % | |||
| Corn grain | 24.8 | 40.7 | 57.6 |
| DDGS 2 | 4.00 | 4.50 | 5.00 |
| Extruded soybean | 3.04 | 3.25 | 3.50 |
| Soybean meal | 3.08 | 2.00 | 0.81 |
| Corn silage | 49.9 | 36.5 | 23.0 |
| Wheat straw | 8.10 | 6.80 | 5.40 |
| Peanut hay | 6.00 | 4.70 | 2.60 |
| Mineral-vitamin premix 3 | 0.36 | 0.52 | 0.69 |
| NaHCO3 | 0.36 | 0.52 | 0.69 |
| NaCl | 0.36 | 0.52 | 0.69 |
| Nutrient level | |||
| Metabolizable energy (MJ/kg) | 10.12 | 10.90 | 11.68 |
| OM (%) | 92.64 | 93.26 | 93.99 |
| CP (%) | 10.61 | 10.62 | 10.59 |
| NDF (%) | 38.39 | 31.71 | 24.59 |
| EE (%) | 3.89 | 4.01 | 4.14 |
1 LE: low energy; ME: medium energy; HE: high energy. 2 DDGS: distillers dried grain with solute; OM: organic matter; CP: crude protein; NDF: neutral detergent fibre; EE: ether extract. 3 Every kilogram of mineral-vitamin premix contained: vitamin A, 625,000 IU; Vitamin D, 100,000 IU; Fe, 6.75 g; Zn, 4.2 g; Cu, 2.5 g; Mn, 10.34 g; Co, 30 mg; I, 90 mg and Se 54 mg.