Table 2 Nutrient requirements according to NRC (National Research Council, 1989) and approximate daily allotments to ten dairy cows one month before expected calving (-1), at calving (0), and one month after calving (+1), calculated on a body weight of 600 kg, and an average milk production of 30 l/day one month after calving.
| Â | Â | Daily requirements (NRC) | Daily allotments | ||||
|---|---|---|---|---|---|---|---|
| Â | Â | -1 | 0 | +1 | -1 | 0 | +1 |
Energy ME1 | Mcal | 16.3 | 30.8 | 65.0 | 21.5 | 31.4 | 71.9 |
Protein | g | 960 | 2090 | 3840 | 1237 | 1798 | 4068 |
Ca | g | 31.2 | 84.7 | 139.2 | 83.9 | 94.7 | 151.1 |
K | g | 52 | 110 | 216 | 217 | 243 | 409 |
Mg | g | 12.8 | 27.5 | 48 | 21.2 | 26.6 | 49.0 |
Na | g | 8 | 19.8 | 43.2 | 12.8 | 13.4 | 15.9 |
P | g | 19.2 | 52.8 | 88.8 | 45.4 | 61.9 | 124.2 |
Cu | mg | 80 | 110 | 240 | 246 | 291 | 473 |
Zn | mg | 320 | 440 | 960 | 1140 | 1236 | 1650 |
Se | mg | 2.4 | 3.3 | 7.2 | 7.1 | 7.2 | 7.9 |
Vit. A2 | mg | 32000 | 44000 | 76800 | -2 | - | - |
Vit. E | mg | 120 | 165 | 360 | 865 | 917 | 1127 |