NDSU Grazing Calculator

Functionality & Mechanism

Developed by North Dakota State University, the NDSU Grazing Calculator is a computational tool for estimating forage carrying capacity and initial stocking rates. The interface captures inputs related to specific livestock types (e.g., cow-calf pairs, sheep), grazing duration, and land area. It then leverages established agricultural formulas, including Animal Unit Months (AUMs) and harvest efficiency percentages, to generate management recommendations. Sessions provide a structured workflow for land managers to determine sustainable grazing plans.

Evidence & Research Context

• The calculator is presented in an associated research publication as a tool to implement established rangeland management principles for North Dakota.
• Calculations are grounded in the use of standard metrics, including Animal Unit Months (AUMs) and Animal Unit Equivalents (AUEs) for different livestock.
• The methodology incorporates a recommended baseline harvest efficiency of 25% for native rangeland and 30% for tame grass pastures.
• Reference data for calculations are based on ecological site descriptions and forage production estimates specific to regional vegetation types.

Intended Use & Scope

This tool is designed for land managers, producers, and ranchers to facilitate initial grazing management planning. Its primary utility is to generate estimates of carrying capacity and stocking rates based on regional data. The calculations serve as a starting point and are not a substitute for direct forage measurement (e.g., clip-and-weigh method) or ongoing field monitoring. Consultation with local extension services is recommended for site-specific validation.