Grazing with Virtual Fencing

Utah State University Extension is conducting applied grazing research to evaluate whether virtual fencing can be used to intentionally graze Phragmites in wetland and lake-adjacent systems. Virtual fencing uses GPS-enabled livestock collars to control animal movement without physical fence. Extension’s role includes designing grazing trials, managing timing and intensity, monitoring vegetation response, evaluating forage nutrition, and translating results into practical guidance for land managers and agencies. This work is conducted under real-world conditions that reflect how public lands are actually managed.


What the Grazing Trials Show

Targeted grazing supported by virtual fencing:

  • Allows precise livestock control in wetlands
  • Reduces Phragmites biomass while maintaining habitat objectives
  • Adapts to fluctuating water levels and shifting boundaries

Forage analysis indicates Phragmites can provide substantial crude protein, particularly earlier in the growing season. Early-season samples commonly averaged ~16–20% crude protein, comparable to moderate-quality alfalfa hay (~18–22%), with later-season values declining to ~8–14%, similar to grass hay. These results show that, when timing and access are intentionally managed, Phragmites can function as a viable primary forage resource, as well as a strategic feed option during drought and forage shortages.

Virtual Fencing and Grazing Resources