The premise of the studies isn't to actually study cows. The premise of the study is to justify getting rid of them.

That's why they included a certain seaweed in an experimental diet for cows that reduced the methane emissions? That was all cover for eliminating the cows?

SNIP A new study by researchers at the University of California, Davis, found that feeding grazing beef cattle a seaweed supplement in pellet form reduced their methane emissions by almost 40% without affecting their health or weight. SNIP

ucdavis.edu - Feeding grazing cattle seaweed cuts methane emissions almost

So there's work being done on cheap easy ways to reduce cows as a source of methane, and others that claim the methane from the conversion to gas of grass, etc., is natural and would happen anyway if the grass wasn't eaten, and it is taken out of the air in the normal cycle. Some think it degrades quickly.

But all of that is just a cover for getting rid of cows.