The animals rotate over pasture improving the soil and pasture each in their own way.
Cattle are moved often within a rotational grazing system that is premised on moving them to new grass before they eat their paddock down to ground level which would begin damaging root systems. Cattle enjoy the pasture in their paddocks while simultaneously dropping fertilizer which is quickly taken up by the recently stimulated grasses.
Laying hens and turkeys free range over the shortened pasture the cattle have recently vacated. They scratch through the cow pies looking for fly larvae, which helps to minimize the fly population and spread the manure over the pasture accelerating its decomposition and reabsorption into the grass sward. The results are pasture and topsoil that get thicker, greener and deeper with each rotation of animals.