The arrival of commercially available genetics to produce dairy cattle that emit less methane could help reduce one of the biggest sources of the potent greenhouse gas, scientists and cattle industry experts say
Burps are the top source of methane emissions from cattle. Semex, the genetics company that sold Loewith the semen, said adoption of the low-methane trait could reduce methane emissions from Canada’s dairy herd by 1.5% annually, and up to 20%-30% by 2050.
Some dairy industry officials remain unconvinced about low-methane breeding, saying it could lead to digestion problems. 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 registry drew on seven years of research by University of Guelph and University of Alberta scientists to measure the methane of dairy cattle. Selecting for the low methane trait could lock in lower and lower emissions for successive generations, she said. 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.
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