While farmers can feed additives to cattle to reduce methane production, their effects wear off once cattle stop eating them and they are not approved for use in the United States, Mitloehner said.

The low-methane breeding material is the product of a partnership between Semex and Canada’s milk-recording agency Lactanet and based on research by Canadian scientists.

Lactanet in April released the world’s first national genomic methane evaluation, and has produced results from Holstein cows and heifers on 6,000 farms, representing nearly 60% of Canada’s dairy farms.

BREATH CAPTURE

The registry drew on seven years of research by University of Guelph and University of Alberta scientists to measure the methane of dairy cattle.

The scientists captured the exhalations of cattle to measure them for methane, and then compared the data against genetic information and milk samples.

Methane emissions from Canadian dairy cows vary widely, from 250 to 750 grams per day, said Christine Baes, professor of animal biosciences at University of Guelph, who worked on the project.

Selecting for the low methane trait could lock in lower and lower emissions for successive generations, she said.

“The breakthrough here is linking these different components to have a national breeding value estimation for methane emissions based on real breath of animals,” Baes said.

“We also have genomic information and we match those up and create almost a telephone book to say, ‘this animal has these genes and produces this much methane.'”

Semex is not initially charging extra for the methane trait, said Michael Lohuis, Semex’s vice-president of research and innovation. He declined to provide sales projections but expects sales to remain slow until financial incentives emerge.

The Canadian government currently offers no incentives for low-methane cattle breeding, but the agriculture department said in an email that Ottawa is working to introduce offset credits for reducing methane through better manure management.

Some countries and food companies have begun to encourage farmers to move to lower-emitting cattle.

New Zealand will begin taxing farmers for methane from cattle in 2025.

Nestle NESN.S and Burger King parent Restaurant Brands International QSR.TO are tackling the methane problem in their supply chains by changing what cattle eat.

Mitloehner said he expects companies to eventually recognize low-methane breeding, too.

“Genetic change is permanent and cumulative across future generations so it can add up to substantive reductions,” Lohuis said. “This is certainly not the only tool dairy producers can use to reduce methane on-farm, but it may be the simplest and lowest-cost approach.”

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