When cows move, they help fight climate change and repair soil. Virtual fencing can help ranchers guide where they graze

October 7, 2021
Rancher Pat Luark checks out the grass growing on his BLM allotment north of Eagle on Sept. 29, 2021.Rancher Pat Luark checks out the grass growing on his BLM allotment north of Eagle on Sept. 29, 2021.Michael Elizabeth Sakas/CPR News
Rancher Pat Luark checks out the grass growing on his BLM allotment north of Eagle on Sept. 29, 2021.

It’s a rainy day on Pat Luark’s ranch, north of Eagle. He drives through the mud to a stretch of public land his cattle graze. He and Kristy Wallner, a rangeland specialist with the U.S. Bureau of Land Management, pull over and examine the ground.

They spot bunches of native grass that dot the soil, a species that’s important to cattle and wild grazers like elk and deer. Luark and Wallner are delighted.

“If we would've got our normal rains, I see the potential of this grass being stirrup-high to the horse,” Luark said.

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Luark and other ranchers’ cattle graze on millions of acres of public land in Colorado. How he and other ranchers manage their cows can affect the health of the land for livestock, wildlife and the climate. 

Despite years of back-to-back drought worsened by a warming climate, the grass here seems to be improving. Luark and Wallner are crediting a new technology that allows them to move cattle without physical fences. 

Under the system, cows are outfitted with shock collars — similar to ones for training dogs — that use GPS and reception towers to form a virtual fence controlled by a computer. The technology from Vence (for “virtual fence”) makes it easier for Luark to move his cattle and determine how long they should spend grazing in a particular spot. 

Courtesy of Kristy Wallner/BLM
Rancher Pat Luark stands with a cow wearing a Vence electric shock collar. the collars use GPS to create virtual fence lines.

He used the technology to keep his cows off 600 acres that needed to rest and regrow, a process that means healthier grass and soil when the cows eventually return. The Bureau of Land Management is funding the virtual fence experiment with a grant.

“Now we can move fences and use ground in a way we never have even thought about,” said Wallner, the bureau’s project manager. 

Wallner sees a lot of benefits to using the Vence technology on BLM land. Without physical fences, wildlife can move freely across the landscape. Virtual fences also mean people recreating on public land won’t accidentally leave a cow gate open. And because the cattle’s location is updated on a digital map, ranchers will know if they’ve wandered into areas that are off-limits.

Moving livestock around improves ecosystem health, but rotational grazing isn’t a new idea. Ranchers use portable electric fences to do the same thing, but that comes with challenges. It’s labor-intensive, wildlife can knock fences down and some pastures — like on the side of a mountain — are hard to access.

Michael Elizabeth Sakas/CPR News
BLM rangeland specialist Kristy Wallner and rancher Pat Luark check out the grass on Luark's BLM grazing allotment on Sept. 29, 2021.

Todd Parker, the director of product and program management for Vence, demonstrated how the software works in a training video. He pulls up a Google Map, which is marked up with different shapes representing pastures on a ranch. In one spot, there are dozens of little dots marking the locations of cows overlaid with orange lines showing the location of the virtual fence.

Parker said the Vence technology frees up ranchers to spend less time chasing cows and fixing fences and more time managing the health of their animals and the land. He said ranchers are worried they’ll be replaced by virtual fences, but he tells them the technology doesn’t eliminate the cowboy — it just changes the job.

Freeing up ranchers to focus on grass and soil health instead of herding cattle can increase profits and reduce the animals’ contributions to climate change, Parker said.

The virtual fences make it easier to move cattle, which means more hooves trampling grass and mixing their urine and manure with the soil, which creates a nutrient-rich layer of mulch that helps store moisture and build healthy soil that stores more atmospheric carbon.

“Grass needs to be grazed,” said Bobby Gill, the director of development and communications for the Savory Institute, a Boulder nonprofit that works around the globe to regenerate grasslands. “It needs to have that stimulation for it to regrow and be an abundant living piece of vegetation.”

Historically, much of that stimulation came from 60 to 75 million bison that once roamed North America and played a vital role in the health and evolution of Western landscapes.

Courtesy of Kristy Wallner/BLM
Rancher Pat Luark, and Vence product and program manager Todd Parker, work to install one of the towers that connect to the cows' shock collars to create a virtual fence line.

Gill said letting livestock graze on their own, without a natural predator to keep them in a herd and chase them around, is doing major damage to the land. To heal grasslands, the Savory Institute wants ranchers to get their cows moving. Gill said virtual fences could help with that. 

“Then what you see is that instead of [livestock] being a polluter to the environment or causing harm, you see the opposite. Livestock end up being this tool for land regeneration,” Gill said.

Gill doesn’t want a virtual fence to mean ranchers spend less time out in the pasture. He said that disconnection has driven much of the recent damage to grasslands. Gill said no tool or technology can replace the intimate knowledge a rancher gets from spending time outside connecting to the land.

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