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Filtering by: Creator Summers, Ed Remove constraint Creator: Summers, Ed Advisor Krueger, William C. Remove constraint Advisor: Krueger, William C.

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  • Spring, summer and fall use by cattle and big game on foothill rangelands

    Creator:
    Miller, Richard F.
    Abstract:
    The objectives of this study were to evaluate environmental factors influencing use of several plant communities by cattle, elk and deer; determine under story production by plant species and the amount utilized by cattle, elk and deer in certain plant communities; evaluate the interactions of range use between cattle, elk...
    Resource Type:
    Masters Thesis
    Full Text:
    Spring, Summer and Fall Use by Cattle and Big Game on

  • A comparison of four methods used in determining the diets of large herbivores

    Creator:
    McInnis, Michael Lindsay
    Abstract:
    Esophageal fistulation, stomach content analysis, fecal analysis, and ocular-estimate-by-plot are four of the most publicized methods of determining the diets of large herbivores. The principal objective of this study was to compare the relative values of each of these methods based upon information collected from bi-fistulated (esophageal and rumen) sheep...
    Resource Type:
    Masters Thesis
    Full Text:
    tall-forb community in early summer and late summer, and from confined sheep fed a hand-mixed diet of

  • Responses of vegetation and sheep to three grazing pressures

    Creator:
    Thetford, Frank Oren
    Abstract:
    A study was conducted over a two year period, 1973 through 1974, on perennial ryegrass-subclover pastures with stocking rates of 7.4 (moderate), 9. 9 (heavy), and 12.4 (overstocked) ewes per hectare to establish guidelines on stocking intensity for dryland improved pastures in western Oregon. Climatic conditions varied annually and caused...
    Resource Type:
    Dissertation
    Full Text:
    summers (1973, 1974) diets of animals from overstocked pastures were deficient in dry matter intake

  • Quality of bluebunch wheatgrass (Agropyron spicatum) as a winter range forage for Rocky Mountain Elk (Cervus elaphus nelsoni) in the Blue Mountains of Oregon

    Creator:
    Bryant, Larry Duane
    Abstract:
    This research was conducted on three study areas on elk winter ranges in Northeast Oregon. One was on the Starkey Experimental Forest and Range and the others were in the same vicinity. Plant appendages, spring and fall defoliation and fall growth of bluebunch wheatgrass were evaluated in terms of quality...
    Resource Type:
    Dissertation
    Full Text:
    pronounced during 1986 when precipitation in late summer initiated fall growth. Growth following spring

  • Growth characteristics and site potentials of perennial grass species

    Creator:
    Borman, Michael M.
    Abstract:
    In this study I assessed the potentials of selected, established perennial grasses to maintain site occupancy in the foothills ecosystem of the Rogue River Valley of southwest Oregon which is currently dominated by a variety of annual plants. The first evaluation compared growth curves of the perennial grasses and contrasted...
    Resource Type:
    Dissertation
    Full Text:
    . In years with an early summer drought, the earlier growing perennial grasses should be able to

  • Nutritional value of several Opuntia species

    Creator:
    Ben-Thlija, Abdellaziz
    Abstract:
    Little is known about cactus nutrients, their proportions in different species and the variability of these proportions with season. In the scant literature available on Opuntia species, no systematic survey has been published to document and compare the nutritional qualities of different species. Also, no studies have been done to...
    Resource Type:
    Masters Thesis
    Full Text:
    general trend of increase in fiber and calcium content from spring to summer. Nearly, these nutrients

  • Modeling riparian zone processes : biomass production and grazing

    Creator:
    Korpela, Edwin J.
    Abstract:
    Seasonal trends in forage production and environmental parameters for five plant community types within a northeastern Oregon riparian zone were described and modeled using correlation and path analysis. Wet meadows produced the greatest amount of herbage biomass, followed by moist bluegrass meadows, gravel bars, forests and dry bluegrass meadows. Trends...
    Resource Type:
    Dissertation
    Full Text:
    three-week grazing period occuring at the end of summer. Concurrent to preference and intake

  • Ecological relationships between cervid herbivory and understory vegetation in old-growth Sitka spruce-western hemlock forests in western Washington

    Creator:
    Happe, Patricia Jenkins
    Abstract:
    The relationships between black-tailed deer (Odocoileus hemionus columbianus) and Roosevelt elk (Cervus elaphus roosevelti) herbivory and understory vegetation in unmanaged forests in Olympic National Park were studied from 1985 - 1989. From 1985 to 1986 I studied the impact of cervid exclusion on shrub, fern, and forb forage quality, tannin...
    Resource Type:
    Dissertation
    Full Text:
    nutrient content such that foraging efficiency was improved during both summer and late winter. In sites

  • Interactions of cattle and chinook salmon

    Creator:
    Ballard, Teena M.
    Abstract:
    Spring chinook salmon spawning occurs in late summer when it is common for cattle to be present in pastures that have streams where fish spawning occurs. This two-year study addressed three main objectives relative to behavioral interactions between cattle and spring chinook salmon during the spawning life history stage. These...
    Resource Type:
    Masters Thesis
    Full Text:
    Spring chinook salmon spawning occurs in late summer when it is common for cattle to be present in

  • Conditioning bunchgrass on elk winter range

    Creator:
    Westenskow, Kathy Jo
    Abstract:
    Research was conducted near the Starkey Experimental Forest and Range in northeastern Oregon. Effects of defoliating bluebunch wheatgrass (Agropyron spicatum (Pursh) Scribn. and Smith) to increase the quality of regrowth available on elk (Cervus elaphus nelsoni) winter range were studied from 1988 through 1990. Clipping treatments were implemented to condition...
    Resource Type:
    Masters Thesis
    Full Text:
    INTRODUC HON The Starkey area of the Blue Mountain range has been utilized for spring and summer range