An animal unit rating is an animal’s energy demand relative to that of the defined standard animal. Energy demand is largely a proxy for dry matter intake, i.e. how much pasture an animal eats.
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Animal units are a way of comparing animals of different classes and species so they can be expressed in a standard format. The most common animal units are an AE (Adult Equivalent) for cattle and DSE (Dry Sheep Equivalent) for sheep.

Animal Units can be used for property valuations, business analysis, enterprise analysis, determining carrying capacity, feed budgeting, etc.

Therefor, they need to be calculated accurately and consistently for them to be useful in establishing accurate information to be used in any of the above situations.

Animal units are also primarily used to record your stocking rates and grazing load on pasture. These unit systems differ around the world. You can pick the most appropriate unit system for your property based on your current location or pick a different unit system.

AgriWebb allows selection between the following Animal Unit Systems for various countries:
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*7.6 MJ ME/day = 1kg

You can update your animal unit selection on either the Mobile App or Web App. The option is set per farm.

On the Menu tab select Settings. 

In the Units of Measurement section, tap Animal Units to select between the available options.

Select Account from the navigation, and then click Farm Management. 

Find your farm in the table, and from the Edit dropdown select Settings. 

A window will pop up allowing you to select from the Animal Units options.

​Sources for definitions