Table 1.
Ingredient and chemical composition of experimental diets (% of DM)
| Item | C:F 40:60 | C:F 60:40 | ||
|---|---|---|---|---|
|
|
|
|||
| High UDP | Low UDP | High UDP | Low UDP | |
| Ingredient (%, as fed) | ||||
| Corn | 28.72 | 32.57 | 50.59 | 57.29 |
| Soybean meal | 0.00 | 5.50 | 0.00 | 0.25 |
| Chinese wildrye | 60.00 | 60.00 | 40.00 | 40.00 |
| Corn gluten meal | 10.00 | 0.00 | 7.90 | 0.00 |
| Urea | 0.00 | 0.65 | 0.00 | 1.00 |
| CaHPO4 | 0.50 | 0.50 | 0.25 | 0.00 |
| Limestone | 0.12 | 0.12 | 0.60 | 0.80 |
| NaCl | 0.50 | 0.50 | 0.50 | 0.50 |
| Premix1 | 0.16 | 0.16 | 0.16 | 0.16 |
| Chemical component | ||||
| DM (% as fed) | 89.72 | 89.65 | 88.85 | 88.11 |
| OM (% DM) | 93.67 | 92.91 | 94.62 | 94.75 |
| GE (MJ kg−1 DM) | 18.32 | 18.47 | 18.43 | 18.50 |
| CP (% DM) | 10.42 | 10.46 | 10.40 | 10.59 |
| Ether extract (% DM) | 2.65 | 2.60 | 3.17 | 3.21 |
| RDP (% DM)2 | 4.85 | 6.41 | 4.74 | 6.65 |
| UDP (% DM)3 | 5.57 | 4.04 | 5.68 | 3.96 |
| NDF (%DM) | 41.33 | 39.19 | 30.52 | 28.58 |
| ADF (% DM) | 24.10 | 23.94 | 17.09 | 16.60 |
| NFC (% DM)4 | 39.27 | 40.66 | 50.53 | 52.37 |
1
One kilogram of mineral premix contained the following: Cu 7,000 mg; Fe 33,000 mg; Mn 30,000 mg; Zn 70,000 mg; I 55,000 mg; Se 20,000 mg; Co 10,000 mg; One kilogram of vitamin premix contained the following: VA 190,000,000 IU; VD3 720,000,000 IU; VE 17,000 IU.
2
RDP = Rumen degraded protein.
3
UDP = Undegraded dietary protein.
4
NFC = Non-fibre carbohydrate, calculated as NFC = OM−CP−EE−NDF (Hall, 2000).