Integrated Farm System Model (IFSM)

The Integrated Farm System Model (IFSM) is a process-based simulation of dairy, beef, and crop farming systems. This whole farm model provides a tool for evaluating the long-term performance, economics, and environmental implications of production systems over many years of weather.

Further information on the Integrated Farm System Model is available at: https://www.ars.usda.gov/northeast-area/up-pa/pswmru/docs/integrated-farm-system-model/

This software was last updated on July 15, 2026.

Dairy Gas Emissions Model (DairyGEM)

The Dairy Gas Emissions Model (DairyGEM)  uses process level simulation and process related emission factors to predict ammonia, hydrogen sulfide, VOC and carbon emissions along with the fossil energy, blue water and carbon footprints of dairy production systems.

Further information on DairyGEM is available at https://www.ars.usda.gov/northeast-area/up-pa/pswmru/docs/dairy-gas-emissions-model/

The software was last updated on July 17, 2026.

Additional Weather Data for IFSM

Downscaled climate data (1950 to 2100) are available for 78 locations across the United States. Each location includes 18 climate files created using 9 general circulation models and 2 projected emission scenarios. Those files can be accessed at:

Beef Gas Emissions Model (BeefGEM)

The Beef Gas Emissions Model (BeefGEM)  uses process level simulation and process related emission factors to predict ammonia, hydrogen sulfide, VOC and greenhouse gas emissions along with the carbon emissions, and energy and water use intensities of beef cattle farms, ranches and feedlots.

The software was last updated on July 10, 2026.