E
East Coast Fever: Acute tick-borne disease
of cattle caused by protozoan parasite and it is characterised by high fever,
lymph node enlargement, dyspnea (respiratory distress), weakness, emaciation
and high death rate in susceptible breeds.
Ecological site: Land with a specific potential
natural community and specific physical site characteristics, differing from
other kinds of land in its ability to produce vegetation and to respond to management.
Synonymous with range site.
Ecological status: The present state of vegetation
and soil protection of an ecological site in relation to the potential natural
community for the site. Vegetation status is the expression of the relative
degree to which the kind, proportions, and amounts of plants in a community
resemble that of the potential natural community.
Ecosystem: Organisms that together with their
physical environment form an interacting system and inhabit an identifiable
space.
Ectoparasite: A parasite that lives in the skin or outside of its host e.g.
lice.
EDF: European Development Fund.
Endemic: Confined in its indigenous occurrence
to a particular region.
Endoparasite: Parasite that lives on the inside
of its host e.g. tapeworm.
Environmental assessment (EA): A concise public
document for which a federal agency is responsible. An EA serves (1) to briefly
provide enough evidence and analysis for determining whether to prepare an environmental
impact statement (EIS) or a finding of no significant impact; and to aid an
agencies compliance with the National Environmental Policy Act when no EIS is
needed; and (3) to facilitate preparation of an EIS when one is needed.
Environmental impact statement (EIS):
An analytical document that portrays potential impacts on the human environment
of a particular course of action and its possible alternatives. Required by
the National Environmental Policy Act (NEPA), an EIS is prepared for use by
decision-makers to weight the environmental consequences of a potential decision.
Enzootic: Occurring endemically among animals,
i.e., continuously prevalent among animals in a certain region.
Epidemic: A widespread occurrence of a disease
in one area at a particular time.
Epidemiology: The study of the incidence and
distribution of diseases and other factors relating to health.
Epizootic: Temporarily prevalent and widespread
disease in an animal population.
Etiology: The science or study of the causes
of disease, both direct and predisposing, and the mode of their operation.
Ewe: An adult female sheep.
Extensive grazing management: Grazing management
that utilises relatively large land areas per animal and a relatively low level
of labour, resources, or capital.