

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/
I wonder if it would be worthwhile to colocate large greenhouses with datacenters. The exhaust temperatures seem compatible with hothouse growing. The heat would still end up in the atmosphere, but at least it could enable growth of fresh local produce first.