The main objective of this investigation was to evaluate relationships
between the production and utilization of forage and deer
browsing of hand-planted Douglas-fir seedlings. A secondary purpose
was to study some effects of selected physical and biological
site factors on the survival and growth of fir seedlings.
Field work was...
In 1959, a large scale grazing study in western Oregon was
initiated to compare the value of perennial ryegrass (Lolium perenne
L.) with subclover (Trifolium subterraneum L.) and tall fescue
(Festuca arundinacea Schreb.) with subclover, and to evaluate common
use grazing on them. The present investigation was undertaken
to determine...
The present study was undertaken to evaluate the seasonal
botanical composition of two grass pastures, tall fescue (Festuca
arundinacea Schreb.) and perennial ryegrass (Lolium perenne L.).
Botanical composition was determined by four methods: dry-weight-rank,
weight-estimate, hand separation, and the constituent differential,
with cattle and sheep grazing at two intensities.
The...
One of the problems facing sheepmen on the nonirrigated pastures of western Oregon, particularly in the foothills surrounding the Willamette Valley, is the lack of succulent green pasture growth during
the late summer breeding season. If early spring lambs are being produced, ewes must be bred in August and September...
"Crested wheatgrass, beardless wheatgrass, and big bluegrass were
seeded as overstory grasses. Streambank wheatgrass, canby bluegrass,
bulbous bluegrass, and Ladak alfalfa were seeded as companion species.
Pure and mixed stands were seeded on sagebrush-bunchgrass
range in eastern Oregon to compare yield and competitiveness. The
grasses were planted in 1956, 1957,...
Recent emphasis on range improvement of sagebrush-bunch-grass
types in Oregon has underscored the need for better understanding
of their importance to deer winter range management. The
objectives of this study were to evaluate the impact of various sagebrush
control practices on the composition, production, and utilization
of deer forage plants...
Sheep and cattle dietary preferences were determined on tall fescue-subclover ( Festuca arundinacea-Trifolium subterraneum) and
perennial ryegrass-subclover (Lolium perenne-Trifoliuni subterraneum)
pastures in western Oregon during the spring and summer periods
of 1964 and 1965. Esophageal-fistulated Willamette ewes and
Hereford and Hereford-Angus yearling cattle were grazed separately
on each pasture mixture...
Previous work has shown that diuron (3-(3, 4- dichlorophenyl)-1,
1-dimethylurea) is less toxic to fall-planted wheat than to wheat
planted in the spring. Diuron has been a significant factor in increasing
yields of winter wheat grown in Oregon's Willamette Valley.
The influence of several selected environmental factors on diuron
toxicity...
Published January 1958. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published August 1959. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Western Oregon receives a surplus of rainfall during fall, winter, and early spring months. Temperature and soil fertility are the principal factors limiting growth during this period. If livestock producers are to take full advantage of the forage potential of this area, it is necessary for them to supply plant...
Published November 1955. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Research was conducted in a mixed-coniferous forest stand
that was clearcut, burned, and seeded in order to study early plant
succession, grazing influences on native and introduced species, big
game use, and environmental relationships vegetation, animal,
and environmental research was carried out from 1965 to 1967 in
three, five-acre exclosures...
Animal dietary preferences have been studied by feeding-site
examinations, animal observation, and stomach and esophageal collections.
Analysis of fecal material for undigested plant cuticle is
another means for obtaining the same information.
This study was conducted to: (1) prepare a microscope slide
series depicting the surface features of leaves and...
This investigation was undertaken to characterize and evaluate
the forage production and utilization of the successional vegetation
of the mixed conifer forest.
Field studies were carried out during the summers of 1962
through 1964 at the Eastern Oregon Experiment Station Hall Ranch
which is located 12 miles southeast of Union,...
Published February 1968. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
-------------------------------------------------------------------------------------------- 24
AUTHORS AND ACKNOWLEDGMENT: D. W. Hedrick is Pro-
fessor of Range Management, Oregon State
Forest associations, secondary succession, and relationships
of plant communities to Roosevelt elk were investigated. Stratification
of vegetation into ecological units and an understanding of secondary
succession by habitat-type were a necessary first step in investigations
into browsing of conifers by elk. The study was jointly conducted
by the Oregon State...
Persistent infections with infectious pancreatic necrosis virus
(IPNV) were established in two salmonid cell lines and in live brook
trout. Virus inocula containing high concentrations of defective
interfering IPNV enhanced but were not a requirement for the establishment
of persistent infections in cell lines derived from steelhead
trout (STE-137) and...
Published October 1967. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
------------------------------------------------------------------------ 40
AUTHORS : D. W. Hedrick is professor of range management,
J. A. B. McArthur is associate
As the management of range lands is intensified or as improvement
activity is increased, a critical need is seen to refine the
understanding of the ecology of these lands. If soil surveys on range
lands are to be meaningful and useful, the relationship between the
fundamental ecological units and the...
The study was conducted over approximately 191,000 acres in central Klamath County, Oregon. The research had three objectives: first, to describe and classify the seral and near-climax vegetation by using polyclimax principles; secondly, to determine the southern extension of five plant associations and one plant associes as previously described by...
A study was initiated in 1961 to characterize seral plant
communities in a part of the Cedar Creek drainage in the Tillamook
Burn. Stratification of vegetation into ecological units was a necessary
first step in conifer-animal damage studies supported by the
Oregon State Game Commission.
Reconnaissance information was recorded in...
Published December 1958. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
............................................................................ 14
This bulletin was prep ared by the following : W. A. Sawyer , Super intendent, Squaw
Butte
Published January 1962. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Revised May 1959. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published December 1957. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published May 1966. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
This study was designed to determine instructor performance
appraisal methods being used in community colleges (in Florida, Iowa,
New York, Texas, and Washington) and to identify factors responsible
for variations in performance appraisal procedures. Questions about
instructor performance appraisal which were examined included: who
does it, for what purposes, what...
Type 2 diabetes mellitus (T2DM) is a disease of multi-complications
affecting more than 20 million US adults. Hyperglycemia is the classic clinical feature of diabetes, and uncontrolled hyperglycemia leads to deadly health complications. Thus, control of blood glucose represents a major goal for diabetics. Human and rodent studies revealed another...
In October, 2016, presidential candidate Donald Trump released a document titled “Contract with the American Voter.” This document promised, among many things, that within his first 100 days of his potential presidency, he would repeal and replace Obamacare. When he was unable to fulfill that promise, he employed rhetorical tactics...
Organoleptically, flavored yogurts appear to contain lower
levels of acetaldehyde than plain yogurt. This study was undertaken
to seek the reasons for this phenomenon by focusing on the analyses
of acetaldehyde production by yogurt culture bacteria in yogurt base
containing added sucrose and by performing other analyses such as
the...
Three closely related isolates belonging to the A₁ serotype of infectious pancreatic
necrosis virus (IPNV) were selected for comparison, to provide insight into the nature of
variation in the virulence of IPN viruses. Brook trout fry (Salvelinus fontinalis) were
experimentally infected with the three isolates by immersion. Cumulative mortalities over...
North American bighorn sheep (Ovis canadensis) have experienced significant declines and population extirpations due to novel pathogens such as Mycoplasma ovipneumoniae. This disease continues to limit the population restoration of bighorn sheep. Therefore, understanding the demographic consequences of pathogen presence and the risk of contact between bighorn populations and potential...
Previous work in this laboratory revealed that hormone analysis using fecal samples may predict the number of fetuses carried by pregnant ewes at mid- to late gestation. Reliable lambing number prediction is useful to the producer. Using gas chromatography/mass spectrometry the 5α- and 5β-series of pregnanes and selected 4- and...
Published January 1896. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Unfished populations of cutthroat trout in three small coastal
streams in Oregon were studied from April of 1962 until November
of 1963. Population size, growth rate, and net production were
estimated for study areas in each stream. The nature of seasonal
movement patterns within the study areas and at fish...
Whole blood selenium levels were measured in 207 horses, representing 41 ranches and 11 regions throughout Oregon. Age, sex,
diet, and history of disease were recorded. Diet was divided into
three categories; local feed only, commercial feed, and Se supplemented feed. Region (p<.01), diet type (p<.01), and a region x...
Studies were conducted in order to evaluate the efficacy of the
orally active, synthetic progestagen, altrenogest, for assisting in the
establishment and maintenance of pregnancy in mares. In experiment
I, nine pony mares were bred, and started on altrenogest treatment
on Day 4 after ovulation. On Day 10 after ovulation,...
Urinary steroids have been studied during early and late pregnancy in
domestic horses or sporadic samples at various stages of pregnancy in wild
equidae. In our studies, urinary estrone sulfate (E1S) and pregnanediol
glucuronide (PdG) were monitored throughout pregnancy in six pony mares by
enzyme immunoassay (EIA). Both hormones were...