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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.

From: Changes in some Blood Micronutrients, Leukocytes and Neutrophil Expression of Adhesion Molecules in Periparturient Dairy Cows

   Daily requirements (NRC) Daily allotments
   -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
  1. 1 Metabolizable energy.
  2. 2 The carotenoid content in the feedstuffs was not determined in this study. However, the estimated allotment was above NRC requirements.