A few things to consider. A minority of cows are free range grass fed, a very small minority are 100% grass fed and free range to an extent that matters, even in the case of 100% grass fed there might be fertilizers used. And make no mistake, cows on open pastures are not a good way to feed the human population from an environmental stand point, probably worse than factory farms honestly. Fields are terrible at sequestering carbon and lack a lot of the biodiversity of the forests most of them historically replaced.