Grazing Vs Browsing

GRAZING

Grazing generally describes a type of feeding, in which a herbivore feeds on plants (such as grasses), and also on other multicellular autotrophs (such as algae). Grazing differs from true predation because the organism being eaten from is not generally killed, and it differs from parasitism as the two organisms do not live together, nor is the grazer necessarily so limited in what it can eat (see generalist and specialist species). 

Many small selective herbivores follow larger grazers, who skim off the highest, tough growth of plants, exposing tender shoots. For terrestrial animals, grazing is normally distinguished from browsing in that grazing is eating grass or forbs, and browsing is eating woody twigs and leaves from trees and shrubs.

Grazing is important in agriculture, in which domestic livestock are used to convert grass and other forage into meat, milk and other products. The word graze derives from the Old English (OE) grasian, "graze", itself related to OE graes, "grass". Further information: River continuum concept#Grazers Water animals that feed for example on algae on stones are called grazers-scrapers. Grazers-scrapers feed also on microorganism and dead organic matter on various substrates.

GRAZING

Browsing is a type of herbivory in which an herbivore (or, more narrowly defined, a folivore) feeds on leaves, soft shoots, or fruits of high growing, generally woody, plants such as shrubs.

This is contrasted with grazing, usually associated with animals feeding on grass or other low vegetation. An example of this dichotomy are goats (which are browsers) and sheep (which are grazers); these two closely related ruminants utilize dissimilar food sources. 

Browse 

BROWSING

The plant material eaten is known as browse and is naturally taken straight from the plant, though owners of livestock such as goats and deer may cut twigs or branches for feeding to the stock. In temperate regions, owners take browse before leaf fall, then dry and store it as a winter feed supplement. In time of drought, herdsmen may cut branches from beyond the reach of their stock, as forage at ground level. In the tropical regions, where population pressure leads owners to resort to this more often, there is a danger of permanent depletion of the supply. Animals in captivity may be fed browse as a replacement for their wild food sources; in the case of bears, the browse may consist of bunches of banana leaves, bamboo shoots, slender pine, spruce, fir and willow branches, straw and native grasses.

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Wikipedia