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It's the opposite. The reason cows produce more methane is precisely because they eat grass.

When grass naturally, does it produce methane?

EDIT: it must be part of cow digestion. I just remember that cow burbs are bigger methane problems, but cow farts are fine. Still not sure about methane from grass dying normally, and maybe there’s lots extra grass being grown for cows that wouldn’t grow normally?

Aerobic decomposition, exposed to oxygen like dead grass on the ground, produces mostly CO2 and H2O (plus some other O based stuff like SO4, PO4, NO3). Anaerobic decomposition, like in a cow's stomachs, produces mostly CH4 and CO2 (plus some other H based stuff like NH3, H2S, PH3).

When the herd eat grass it stimulates grass growth and grass is a huge carbon sink. there is a cool ted talk about this. https://www.youtube.com/watch?v=vpTHi7O66pI

If you put the grass where nothing grew before, like a desert. The situation in reality is the opposite: people make forests into grassland.

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