[1] Pasture lands in the narrow sense are enclosed tracts of farmland, grazed by domesticated livestock, such as horses, cattle, sheep, or swine.
The vegetation of tended pasture, forage, consists mainly of grasses, with an interspersion of legumes and other forbs (non-grass herbaceous plants).
[2] Pasture in a wider sense additionally includes rangelands, other unenclosed pastoral systems, and land types used by wild animals for grazing or browsing.
Unlike factory farming, which entails in its most intensive form entirely trough-feeding, managed or unmanaged pasture is the main food source for ruminants.
Pasture feeding dominates livestock farming where the land makes crop sowing or harvesting (or both) difficult, such as in arid or mountainous regions, where types of camel, goat, antelope, yak and other ruminants live which are well suited to the more hostile terrain and very rarely factory-farmed.