This is a farming system in which the farmer rears animals like sheep, cattle etc on a large scale and moves them from place to place in search of food and water.
The farmer can obtain meat or milk from the animals.
The farmer can use the droppings for manures.
Excessive grazing will destroy the vegetation of the land.
Over garzing will cause erosion.
The animals could also be attacked by predators.
There could be easy outbreak of diseases such as anthrax