Montana Grazing Animal Unit Month (AUM)/Acre Estimator
Range and Pasture Technical Note Number MT-32 (Revision 2)
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and Pasture Technical
Note Number MT-32
(Revision 2)(PDF; 68 KB)
Rangeland and dryland pasture Animal Unit Month (AUM) estimations are needed for
a variety of conservation planning and data applications.
Anticipated Uses of the AUM Estimator
- Montana Department of Revenue - Application for Agricultural
Classification of Lands, AUM calculations calculations (must use the Below
Normal AUM/Acre values for qualifying agricultural land). .
- • Any other uses where having a reasonable estimate of grazing potential
facilitate soil and water conservation activities, especially when weather
doesn’t permit on-site vegetation sampling.
Definition of AUM/Acre Parameters
- Below Normal AUM/Acre values – lower precipitation and possibly cooler
temperatures at a critical time that leads to lower production for the
historic climax or near climax plant community. These AUM/Acre values
should be used for AUM estimation where the plant community is at less than
the historic climax or near climax condition or similarity index.
- Normal AUM/Acre values – precipitation and temperature that allows for
normal plant production for the historic climax or near climax plant
- Above Normal AUM/Acre values – higher than normal precipitation as well
as adequate temperatures that allows higher plant production for the
historic climax or near climax plant community.
If you have any questions, please contact:
Jon Siddoway, Rangeland Management Specialist
Phone: (406) 587-6790
State Resource Conservationist
Phone: (406) 587-6998
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