"Every time manure falls onto the ground, an enormous number of rumen microorganisms are carried with it and are incorporated into the soil by the animals trampling hooves"

Because these microorganisms are the same as the soil microbes responsible for plant decomposition,  this flood of rumen microorganisms boosts soil microorganism population at the very instant when passing herds' migration provides a surge of dead plant remains."
(Grass - Fed Cattle , Julius Ruechel)

Cattle can turn unproductive land into productive land because they can go where tractors can't

High density grazing in mid January.  We'll see how long we can go before feeding hay. The goal is to not use any hay.