The most common feature of nomadic agriculture is

Nomadic agriculture (also called nomadic pastoralism or nomadic herding) is a system in which livestock keepers move continuously with their animals from one grazing area to another in search of fresh pasture and water. The defining characteristic is that neither the herder nor the animals are settled in one place.

The phrase "the unsettled husbandry of animals" captures this essential feature: the management of livestock in a non-permanent, continuously moving manner. The word "unsettled" directly reflects the nomadic nature of the practice.

Bush fallowing is associated with shifting cultivation, a crop-based system in which farmland is cultivated for a few years and then left to regenerate. Growing crops and rearing animals together describes mixed farming. The primitive husbandry of crops describes subsistence crop farming, not animal-focused nomadism.

Examination tip: Distinguish between nomadic herding (movement with animals), ley farming (alternating crops and pasture on the same land), and mixed farming (simultaneous crop and livestock production on a settled farm).