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What is an Animal Unit?
An animal unit rating is an animal’s energy demand relative to that of a 'standard animal'. Energy demand is largely a proxy for dry matter intake, i.e. how much pasture an animal eats.
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.
Therefore, they need to be calculated accurately and consistently updated as the growth of the animal changes across its lifetime.
(Cited from Bush Agribusiness - https://bushagri.com.au/animal-units)
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 Mob Management subscriptions allows the selection between the following Animal Unit Systems for various countries:
Australia
Dry Sheep Equivalent (DSE)
Based on a 2 year old 45 kg Merino sheep (wether or non-lactating, non-pregnant ewe) at maintenance.
1 DSE = 7.6 MJ ME/day
*7.6 MJ ME/day = 1kg
Large Stock Unit (LSU)
Based on a 400 kg steer at maintenance.
1 LSU = 49.4 MJ ME/day
Livestock Unit (LSU)
Based on a 425 kg feeder steer at maintenance.
1 LSU = 52.4 MJ ME/day
Adult Equivalent (AE)
Based on a 450 kg Bos Taurus steer at maintenance, 2.25 years of age, and walking 7 km each day.
1 AE = 72.6 MJ ME/day
New Zealand
Stock Units (SU)
The base ewe was assumed to weigh 55 kg (pre-mating), wean one lamb at 25 kg and consume 550 kg DM per annum.
1 SU = 10.5 MJ ME/day
South Africa
Large Stock Unit (LSU)
An ox with a weight of 450kg and a weight gain of 500g per day on grass pasture with a mean Digestible Energy (DE) concentration of 55%.
1 LSU = 75.0 MJ ME/day
Small Stock Unit (SSU)
The definition of the SSU is relative to the South African LSU where 1 LSU = 6 Small Stock Units.
1 SSU = 12.5 MJ ME/day
UK
Livestock Units (LSU)
Based on a 650 kg dairy cow producing 3000 kg of milk annually.
1 LSU = 124.9 MJ ME/day
USA
Animal Units (AU)
The animal unit is defined as one mature 1,000 pound cow and her suckling calf. It is assumed that such a cow nursing her calf will consume 26 pounds of dry matter (DM) of forage per day (20 lbs for the cow and 6 lbs for the calf).
1 AU = 89.6 MJ ME/day
You can update your animal unit selection on either the Mobile App or Web App. The option is set per farm.
Mobile App
On the Menu tab select Settings.
In the Units of Measurement section, tap Animal Units to select between the available options.
Web App
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.
Updating Animal Unit Ratings
*For the purposes of this article, we are showing DSE as our animal load rating example, but you can use which ever rating you wish (such as AE, LSU , etc) through your farm settings.
Learn more about animal units.
Maintaining accurate animal load ratings is important because they will affect other areas of your operation in terms of stocking rates and grazing intensity.
Keeping these up to date will help you manage your grazing plan.
Mobile App
From the Map tab, select the mob to update its AE / DSE.
Tap & Hold the AE / DSE box and update your AE / DSE figure.
You can update the DSE value for one mob or add in bulk mobs.
Web App
Updating AE / DSE values for multiple mobs can also be done on the web app.
Select the Livestock tab> Add Records> DSE
Choose the appropriate mobs that you would like to update the DSE value for.
Enter the DSE value and press Save.
Sources for definitions
Australia
New Zealand
South Africa
United Kingdom
USA