Table 2.
Chemical composition of experimental diets1
| Nutrient2 | Milk replacer |
GAM | Calf starter | |
|---|---|---|---|---|
| CON | VAR | |||
| DM, % | 96.72 | 96.61 | 94.56 | 87.47 |
| CP, % | 20.58 | 28.02 | 64.28 | 21.61 |
| Fat, % | 20.92 | 16.72 | 4.16 | 4.62 |
| Ash, % | 7.64 | 6.10 | 8.33 | 5.34 |
| Calcium, % | 1.56 | 1.26 | 0.73 | 0.83 |
| Phosphorus, % | 0.83 | 0.80 | 0.44 | 0.75 |
| Potassium, % | 0.75 | 0.63 | 0.26 | 0.82 |
| Magnesium, % | 0.14 | 0.13 | 0.30 | 0.23 |
| ADF, % | — | — | — | 4.82 |
| Lactose3 | 50.86 | 49.16 | — | — |
| ME, Mcal/kg4 | 4.755 | 4.728 | 3.289 | 3.712 |
1
CON = Milk replacer fed at 454 g/d; VAR = milk replacer fed at 454, 681, 908, and 454 g/d on d 0 to 7, 8 to 14, 15 to 31, and 32 to 41, respectively; GAM = dietary supplement containing bovine serum.
2
Data are on an air-dry basis.
3
Calculated as 100 − protein − fat − ash.
4
Metabolizable energy, calculated from NRC (2001) as: (0.057 × CP % + 0.092 × fat % + 0.0395 × lactose %) × 0.97 × 0.96 for calf milk replacer (CMR) and (0.057 × CP % + 0.094 × fat % + 0.0415 × carbohydrate %) × 0.82 to calculate DE. ME = (1.01 × DE − 0.45) + [0.0046 × (fat % − 3)] for starter and additive. Carbohydrate = 100 − protein − fat − ash.