Use
Livestock grazing comparison units are used for assessing the overall effect on grazing land of different types of animals (or of mixtures of animals), expressed either as a total for a whole field or farm, or as units per hectare (ha) or acre. For example, using UK government Livestock Units (LUs) from the 2003 scheme a particular 10 ha (25-acre) pasture field might be able to support 15 adult cattle or 25 horses or 100 sheep: in that scheme each of these would be regarded as being 15 LUs, or 1.5 LUs per hectare (about 0.6 LUs per acre).
Different species (and breeds) of livestock do not all graze in the same way, and this is also taken into account when deciding the appropriate number of units for grazing land. For example, horses naturally graze unevenly, eating short grass areas first and only grazing longer turf if there is insufficient short grass; cattle graze longer grass preferentially, tending to produce a uniform sward; goats tend to browse shrubs if these are available. As these feeding styles are complementary, a pasture may therefore support slightly more units of mixed species than of each species separately. Another consequence of different grazing styles is variation between species in the number of units that can lead to overgrazing – for example, horses may overgraze the short parts of a pasture even when taller grass is still available.
Livestock grazing comparison units are used by many governments to measure and control the intensity of farming. For example, until 2004 the UK Government had an extensification scheme which paid additional subsidy to farmers who kept their livestock at less than an average of 1.4 LUs per hectare.
Read more about this topic: Livestock Grazing Comparison
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