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Calculating Metabolisable Energy (ME) needs is important for dairy cows. You adjust for feed quality by adding or subtracting 4% per MJ ME/kg DM from the standard 11.0 MJ ME/kg DM. Consider factors like maintenance, milksolids production, walking, weight change, and feed wastage to work out daily requirements. These calculations are important to keep your cows healthy and maximise milk production. Make sure you adapt the guidelines to your farm's specific conditions for best results.
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.
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.
|MJ ME/kg DM||Jersey (kg MS)||J X F (kg MS)||Friesian (kg MS)|
|12 wks prior to calving||8 wks prior to calving||4 wks prior to calving||2 wks prior to calving||Annual total|
(Diet ME required or saved)
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.
Note: Diet ME required reduced by 19 MJ ME from loss of Lwt
|J x F||450||11.6||13.1||14.7||16.3||17.8|
|J x F||450||12.2||13.7||15.2||16.6||18.1|
Note: No walking or Lwt loss or Lwt gain included
|J x F||450||13.3||14.6||15.9||17.2||18.5|