Record Details

Fascioloidiasis of cattle, deer and elk in Oregon and southern Washington

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Field Value
Title Fascioloidiasis of cattle, deer and elk in Oregon and southern Washington
Names Dutson, Val J. (creator)
Knapp, Stuart E. (advisor)
Date Issued 1965-03-05 (iso8601)
Note Graduation date: 1965
Abstract The biology, history and synonyms of
reviewed and the known distribution given.
Fascioloides magna were reviewed and the known distribution given. Studies have shown that Cervidae are the natural hosts and domestic
ruminants the accidental hosts. The parasite is reportedly
pathogenic to goats and sheep but causes severe tissue reactions in
cattle. The trematode is unable to reproduce in cattle but may occasionally
in sheep and goats.
During this study 107 Oregon and 19 Washington cattle were
traced from abattoirs to the source of infection. The main source
of cattle infections for Oregon and southern Washington was the
Columbia River area. Other enzootic areas were Wheeler, Klamath,
Douglas and Coos Counties in Oregon and Yakima County in Washington. Survey data showed that F. magna was either rare or did not
occur in deer and elk in the Coastal Mountain Range or in Benton County of the Willamette Valley in Oregon. There was a high incidence
of infected elk in the Cascade Range of Lane County. Reports
indicated the incidence was also high in deer of the Columbia River
area from Portland to Astoria.
On the major study area, Tenasillahae Island in the Columbia
River, 94 percent of the deer and 77 percent of cattle were infected.
Two proven snail hosts, Stagnicola Palustris and Pseudosuccinea
columella were the only Lymnaeidae snails found on the island and it
was concluded that they were intermediate hosts for F. magna in this
area.
Stagnicola palustris, P. columella, Lymnaea auricularia and
Stagnicola bulimoides were found in Oregon and S. palustris in Washington.
No naturally infected snails were found nor were any experimental
infections successful.
Pigmentation of the liver and lymph nodes, omentum and diaphragm
was found in each case of infected deer and elk even when no
closed cysts were present. A massive infection in one Tenasillahae
Island deer resulted in adhesions, hyperplasia, necrosis of the liver
and extensive pigmentation.
The ova from cattle were darker colored, thicker shelled and
shorter than those from deer and elk.
Fluke ova incubated in an "egg bath" hatched by the 12th day.
A theory of the reabsorption of F. magna cysts by the omentum of deer as a means of eliminating the cysts from the liver was presented.
It was concluded that F. magna was of minor importance as a
state-wide problem in Oregon. The Columbia River area was considered
a major local problem and would become increasingly important
as the use of islands and diked areas are more extensively
used for raising livestock.
Genre Thesis/Dissertation
Topic Cattle -- Diseases
Identifier http://hdl.handle.net/1957/48146

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