

The problem isn’t methane production, it’s excessive soluble proteins producing a thick foam that prevents the methane from being expelled through the esophagus. Any feed produces large amounts of gas in grazing animals. What changes is the animals ability to safely vent the gas.
https://biologyinsights.com/why-does-alfalfa-cause-bloat-in-cattle/
They’ll have a unique Pollock inspired piece in no time.