• Bandwidth
  • Search the website

Lactating Cows

The requirements are calculated for pasture at 11.0 MJ ME/kg DM. For different pasture quality make the following adjustments to calculate the ME requirements.

  • ME requirements with increasing feed quality: subtract 4% per MJ ME above 11.0 MJ ME/kg DM
  • ME requirements with decreasing feed quality: add 4% per MJ ME below 11.0 MJ ME/kg DM

Note: The feed requirement figures are 'eaten' feed demand plus 6% to allow for feed wastage observed under good feeding conditions of pasture in farmlet trials. Where feed (pasture or supplement) wastage rates are higher than those stated, requirements for feed offered need to be increased.

Maintenance MJ ME/day (Lwt kg)

300 350 400 450 500 550 600
40 45 50 54 59 63 68

Milksolids MJ ME/kg MS by breed

MJ ME/kg DM
Jersey (kg MS)
J X F (kg MS)
Friesian (kg MS)
10 81 84 86
11
77 80 82
12
74 77 79

Walking MJ ME/km

Flat Rolling Hilly/steep
2.0 3.0 6.0

Pregnancy MJ ME/day

12 wks prior to calving 8 wks prior to calving 4 wks prior to calving 2 wks prior to calving Annual total
Jersey 11 18 32 42 2,840
J x F 12 21 37 48 3,240
Fresian 13 23 41 54 3,610

Lactating cow liveweight MJ ME/kg Lwt change

(Diet ME required or saved)

  • Lwt gain 50
  • Lwt loss -37

Example: Daily requirements of a 450 kg JXF cow, producing 2.0 kg MS/day and losing 0.5 kg/day Lwt at 12.0 MJ ME/kg DM.

  • Maintenance = 54
  • Walking on flat (3 km a 2 MJ ME/km) = 6
  • Milksolids (2.0 kg MS x 80 MJ) = 160
  • Lwt loss (0.50 kg Lwt x -37 MJ) = -19
  • Total MJ ME at 11.0 ME = 201
  • ME requirements reduced by 4% as 12.0 ME fed = 201 x 96% = 193
  • Total kg DM Eaten (193 divided by 12.0 ME) = 16.1 kg DM

Note: Diet ME required reduced by 19 MJ ME from loss of Lwt

Total daily dry matter requirements lactating cows (kg DM/cow/day); for daily milksolids production

Daily milking cow requirements: kg DM/cow/day at 10.5 MJ ME/kg DM

Breed
kg Lwt 0.8 1.0 1.2 1.4 1.6
J 350 10.4 11.9 13.4 14.9 16.4
J
400
10.9 12.4 13.9 15.4 16.9
J x F
450 11.6 13.1 14.7 16.3 17.8
Fr
500 12.1 13.7 15.3 17.0 18.6
Fr
550
12.6 14.2 15.8 17.4 19.0

Daily milking cow requirements: kg DM/cow/day at 11.0 MJ ME/kg DM

Breed
kg Lwt 1.0 1.2 1.4 1.6 1.8
J 350 11.1 12.5 13.9 15.3 16.7
J
400
11.5 12.9 14.3 15.7 17.2
J x F
450 12.2 13.7 15.2 16.6 18.1
Fr
500 12.8 14.3 15.8 17.3 18.8
Fr
550
13.3 14.8 16.3 17.8 19.3

Note: No walking or Lwt loss or Lwt gain included

Daily milking cow requirements: kg DM/cow/day at 12.0 MJ ME/kg DM

Breed
kg Lwt 1.4 1.6 1.8 2.0 2.2
J 350 12.2 13.5 14.7 15.9 17.2
J
400
12.6 13.9 15.1 16.3 17.6
J x F
450 13.3 14.6 15.9 17.2 18.5
Fr
500 13.9 15.2 16.5 17.8 19.1
Fr
550
14.3 15.6 16.9 18.2 19.5