Table 1.
Ingredients and chemical composition (%) of the experimental diets (DM basis)
| Item | Dietary treatments | ||
|---|---|---|---|
|
| |||
| LCP | MCP | HCP | |
| Ingredients (% of DM) | |||
| Yellow corn silage1) | 45.00 | 45.00 | 45.00 |
| Corn grain | 41.53 | 36.51 | 31.49 |
| Soybean meal | 2.15 | 4.73 | 7.32 |
| Rapeseed meal | 3.69 | 5.82 | 7.96 |
| Wheat bran | 5.70 | 6.01 | 6.30 |
| Calcium carbonate | 0.55 | 0.55 | 0.55 |
| Dicalcium phosphate | 0.28 | 0.28 | 0.28 |
| Sodium chloride | 0.55 | 0.55 | 0.55 |
| Mineral-vitamin premix2) | 0.55 | 0.55 | 0.55 |
| Chemical composition (% of DM) | |||
| Dry matter | 90.84 | 90.77 | 91.05 |
| Organic matter | 93.31 | 93.27 | 93.30 |
| Crude protein | 10.21 | 12.35 | 14.24 |
| Rumen degradable protein3) | 4.22 | 5.17 | 6.03 |
| Total digestible nutrients3) | 64.33 | 64.85 | 64.36 |
| Neutral detergent fibre | 44.35 | 44.55 | 44.29 |
| Acid detergent fibre | 23.01 | 23.16 | 23.80 |
| Calcium | 0.50 | 0.52 | 0.51 |
| Phosphorus | 0.26 | 0.27 | 0.25 |
DM, dry matter; LCP, low crude protein; MCP, medium crude protein; HCP, high crude protein.
1)
The chemical composition of yellow corn silage (DM basis) was 92.33% for organic matter, 73.69% for neutral detergent fibre, 43.19% for acid detergent fibre and 6.5% for crude protein.
2)
Premix composition/kg: Vitamin A, 1,000,000 IU; Vitamin D3, 350,000 IU; Fe, 4,200 mg; Cu, 2,500 mg; Mn, 5,700 mg; Zn, 5,700 mg; I, 85 mg; Se, 85 mg; and Co, 30 mg.
3)
Rumen degradable protein and total digestible nutrients were calculated according to NRC [14].