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same thing is for protein present in grass but indigestible for humans.

cows can extract "enormous" amounts of protein from foods that humans wouldn't ever.

it's very hard measuring how much digestible protein something has, such as beans, or lentils, or soybeans. it depends if you eat the shell, did you blend the shell like a mad man, even if you blended beans into a homogenous phlegm

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Cows are not extracting protein from grass (well not much), they are converting the cellulose in the grass into microorganisms and then extracting the proteins from the microorganisms. The ruminant digestive system is an amazing system [1].

1. https://en.m.wikipedia.org/wiki/Ruminant

You mean, microorganisms allow better deconstruction of cellulose which then frees the protein and makes it digestable?

Yeah, ruminants are amazing with their cyclic puking and eating :)

Cows actually can't digest cellulose at all - what they can do is harbour the microorganisms that can. These microorganisms are then eaten by the cow and provide most of the protein in a cows diet.

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