One of our neighbours in Cumbria had operated a hugely successful milking herd of Jerseys on a smallholding less than 1/4 the size of dairy farms with the same headcount (and less output per kg of cow), using folding to manage the land use, which I think is similar? Basically grazing strips, moving the electric fencing every day or two. So they always have just enough grass for today, and mostly all the poo lands on what they grazed hard yesterday.