| http://www.w3.org/ns/prov#value | - Meat cattle, sheep and other livestock - take the average of two other methods: 1. calculate the ratio of the area of irrigated grazing land to the total area of grazing land and multiply this ratio by the total production for the commodity group (this is referred to as the ???area formula???); 2. if the farm has any irrigation of grazing land then assume that all livestock production on the farm
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