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Grazing Response Index: How Healthy Are your Grazing Lands?

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Media Relations
Agriculture and Agri-Food Canada

The Grazing Response Index (GRI) is a rangeland assessment tool developed in the United States and adapted to western Canadian rangeland conditions. The Index is a simple method to evaluate whether the current grazing management impacts have beneficial, neutral or harmful effects on plant health and establishes whether or not ranchers might need to adjust their grazing management techniques.

GRI uses three factors to evaluate grazing management impacts on plant health: frequency, intensity of grazing and opportunity for plant recovery. The combination of these factors measures plant responses to defoliation as positive, negative or neutral.

"This short term monitoring tool helps producers and land managers evaluate the effects of their current grazing management on plants and decide how to manage their rangeland the following year."

– Kerry LaForge, Senior Range and Forage Biologist at Agriculture and Agri-Food Canada

How the GRI is Calculated

Find Your GRI

The GRI tool provides a basis to assess the potential impacts of grazing. In combination with other comprehensive rangeland assessment tools, GRI can help ranchers make range management decisions to maintain or improve plant health, structure and vigour.


Photo Gallery

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Steer grazing an AAFC research plot.
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Alfalfa, a forage plant commonly found in grazing lands.
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