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Rumen8 can be downloaded and used straight away in trial mode but is restricted to 4 diet ingredients until it is registered. Registration is free.

To apply for a registration number please send an email to Richard Morris at with your name (first and surname) and the email you would like to be contacted on. If you don't mind telling us where you are (country and region will do) and your role in the dairy industry it helps us see who is using Rumen8 and better target improvements in the future. Rumen8 emails are very infrequent and your email address will not be shared.

Rumen8 3 can be registered with your Rumen8 2 user name and code so if you still have it just use that. If you have lost it send Richard and email on the address above.


Rumen8 runs on Windows 7, 8.1 and 10 computers and needs a minimum screen resolution of 1024 x 768. Other than that, if your computer can run Windows adequately it should run Rumen8.

Download the installer

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Download the Windows installer for Rumen8 3 (47 MB)

The SAP Crystal Reports Runtime is required to create reports - 32bit and 64bit (97 MB)
These can also be downloaded from the SAP website

Download the Rumen8 User Guide (6 MB - included in the Rumen8 3 installer)

Download the Rumen8 Training Manual (3 MB - included in the Rumen8 3 installer)

Download the Rumen8 Feed Companion (2 MB - included in the Rumen8 3 installer)

If you are having trouble downloading and installing Rumen8, download the User Guide above which includes step by step instructions with screen shots to help you.
If the Windows 'SmartScreen' is preventing you running the installer look in the FAQ for instructions.

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What's new version December 2018

  • Fixed bug that displayed the equivalent milk prices incorrectly for dry cows.
  • Fixed a bug that reset the heifer weight to 40kg occasionally.

What's new version November 2018

  • Fixed a bug that prevented Rumen8 from prompting to save when quitting with unsaved changes.

What's new version November 2018

  • New diet comparison report added.
  • Warnings added to the diet ingredients if the maximum feeding rate is exceeded.
  • A fifth set of recommended levels added along with an off option. Now allows parameter ranges for early, mid & late lactation plus dry and transition herds.
  • Maximum milk price increased to $9999.99.
  • Milk price now changes to cents per kilogram when the milk units are kilograms.
  • Cow live weight change body condition score calculator revised and includes Penn State 1-5 system.
  • Penn State body condition score system added to the live weight change tool tip.
  • Diet ash content/organic matter content tool tip added to the Diet Detail tab.
  • Fixed a bug that prevented some diet costs saving.

What's new version August 2018

  • Fixed a bug in the calculation of the $Milk/$Feed efficiency parameter.
  • Feed costs are no longer displayed if any diet ingredient is missing its cost.

What's new version June 2018

  • Heifer mineral requirement added.
  • Standard cows with 2000, 3000 & 4000 litre lactations added.
  • Restoring a stored diet now has the option to also restore the animal.
  • Maximum feed cost has been increased to $9999999/tonne.
  • The herd margin will now display negative margins.
  • Shift clicking a diet ingredient number will remove that ingredient.
  • Feed editor import cancel button changed to Skip All to make the function clearer.
  • Added tool tips to the Feed editor import CSV buttons.
  • Changed the Import, Diet menu text to make it’s function clearer.
  • Pasted forage:concentrate ratio increased to 2 decimal places and the title is clearer.
  • The report disclaimer entry box style now matches others.
  • Calculated ingredient amount (wet from entered dry matter and vice versa) now rounded to 2 decimal places to prevent rounding inconsistencies.
  • Expanded the explanation for excess protein removal cost tooltip and changed units to KJ/g N.
  • Expanded the excess protein forgone milk explanation in the tool tip.
  • Provided grams of MP/litre of milk table in the tooltip for true protein concentration on the Animal tab.
  • Added MP efficiency coefficients to the MP Detail window.
  • Improved wording of save default animal dialog box.
  • Improved wording in the User Feed Library flag tooltip.
  • Improved wording for menu option to move dry cow into transition herd.
  • Fixed a bug that prevented the eNDF recommended levels traffic light from working.
  • Fixed a bug that prevented the Forage:Concentrate recommended levels traffic light from turning off when no diet was loaded.
  • Fixed a bug that prevented the recommended DCAD levels being updated to the 2017 values.
  • Fixed a bug that prevented restoring the Split Herd diet in some circumstances.
  • Fixed a bug that blanked wet cost when dry matter cost was entered as 0 and vice versa in feed and mix editor.
  • Fixed calculation of the non-entered cost when the dry matter of the mix is changed and the mix is complete.
  • Numerous internal updates to allow easier maintenance and future updates.

What's new version May 2018

  • Improved the heifer protein demand calculation by replacing the default 1.25 adjustment with a correction factor based on liveweight (Tedeschi 2015). This will increase heifer protein demand.
  • Expanded tooltip information in Preferences for MP requirement adjustment and NDF intake as a percent of liveweight.
  • Added the NDF intake as a percent of liveweight to the Max DMI NDF% value on the Diet Detail tab.

What's new version April 2018

  • Bug fixed that prevented ingredient 10 restoring correctly from the Compare tab.
  • Fixed a calculation error on the Diet report for ingredient mineral supply. Thanks to David H. for reporting this.
  • Fixed the calculation of mix mineral absorption rates.

What's new version March 2018

  • The Diet report now allows negative margin over feed costs and larger dollar values.
  • Added dry matter intake as a percentage of cow liveweight to the Diet detail tab.
  • Added tool tips to the Milk price tab headings.
  • The minimise and maximise controls have been restored to the main windows.
  • Fixed a mix cost bug that prevented fresh weight costs being entered. Thanks to Glenys H. for reporting this.
  • Fixed bug where preference validation values were not being read from the file correctly.

What's new version March 2018

  • Fixed occasional bug when importing an old diet file after a failed attempt to import a non-Rumen8 csv file.
  • Improved milk prices database upgrade process.

What's new version March 2018

  • Additional information about the Metabolisable Protein Correction Factor added to the User Guide, Help and Advanced preferences tooltip.
  • Fixed a bug when importing a v2 feed library.
  • Fixed bug when exporting mixes.

What's new version March 2018

  • Diet, Batch and Feeding reports can be printed or saved as PDFs from the File menu (reports require the SAP runtime software to be installed, see Getting Started in the User Guide for details).
  • Easily share feeds and mixes by exporting and importing them from the Feed Editor Selection tab.
  • Combine separate diets for split herds in the new Split herd tab.
  • Define up to 10 milk price sets in the Milk Price tab.
  • Create diets for heifers by selecting a heifer in the Breed & Maturity drop-down menu.
  • Calculate the target growth rate for heifer herds with the calculator on the Animal tab.
  • Suggest cow live weight change with the calculator on the Animal tab.
  • Estimate the additional liveweight change required to increase body condition score in the cow live weight change calculator.
  • Milk fever risk is estimated for transition cow diets on the Diet Detail tab.
  • There is now a warning on the Diet tab if a monitored parameter on the Diet Detail tab is out of the recommended range.
  • Animal parameters can be entered directly on the Animal tab in addition to using the sliders.
  • The updated User Guide is now available from the Help menu, the F1 key or the help button (?) in the window title bar.

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