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Filtering by: Subject Beef cattle--Evaluation--Oregon Remove constraint Subject: Beef cattle--Evaluation--Oregon Academic Affiliation Animal Science Remove constraint Academic Affiliation: Animal Science Resource Type Dissertation Remove constraint Resource Type: Dissertation

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  • Nutrition and management of the beef unit for production of slaughter animals on range and improved pastures in southeastern Oregon

    Creator:
    Daugherty, Dennis A.
    Abstract:
    Studies were conducted over a two year period to evaluate alternative finishing methods for spring and fall-born beef cattle. Management alternatives from birth to slaughter included season of calving, lactating cow nutrition, preweaning calf nutrition, weaning age, calf and yearling winter nutrition, range and irrigated pasture supplementation, grazing practice, range...
    Resource Type:
    Dissertation
    Full Text:
    -born beef cattle. Management alternatives from birth to slaughter included season of calving, lacta

  • Selection applied, response of traits and combining abilities of inbred lines of beef cattle

    Creator:
    Hoornbeek, Frank K. (Frank Kent), 1928-
    Abstract:
    The investigations reported are based on two studies; the first is concerned with the selection practiced for performance in one inbred Angus and three inbred Hereford lines of cattle, the realized responses, levels of inbreeding and associated performance, and heritabilities of the performance traits. Selection differentials for all performance traits...
    Resource Type:
    Dissertation
    Full Text:
    ABILITIES OF INBRED LINES OF BEEF CATTLE by FRANK KENT HOORNBEEK A THESIS submitted to OREGON

  • Computer simulation of beef cattle production systems in the Llanos of Columbia

    Creator:
    Levine, Joel Martin
    Abstract:
    A simulation model capable of execution on a programmable calculator was developed to study voluntary intake, liveweight change, and fertility of grade Zebu cows in the Llanos of Colombia. Organic nitrogen in the diet and meta bolic weight were used to predict intake; age, liveweight, and energy concentration were the...
    Resource Type:
    Dissertation
    Full Text:
    Computer simulation of beef cattle production systems in

  • Alternate methods of fattening steers in Eastern Oregon

    Creator:
    Whittington, David Lynn
    Abstract:
    Studies were conducted at the Squaw Butte Experiment Station during two consecutive years to : (1) compare various internal indicators and chromic oxide to estimate forage intake and fecal production, (2) compare methods of producing slaughter weight steers using maximum quantities of forage and minimum quantities of grain. Actual fecal...
    Resource Type:
    Dissertation
    Full Text:
    evaluation is needed in cattle. The Cr 2 0 3 -paper method has some obvious drawbacks. Administration of

  • Mathematical modeling of selection and crossbreeding in beef cattle

    Creator:
    Clarke, Stephen Emil
    Abstract:
    A mathematical model was developed to simulate alternative selection and crossbreeding strategies for commercial beef production. Biological and economic constraints were selected to represent typical pasture production of calves in the Northwest. The crossbreeding study evaluated the relative economic efficiency of different 1) mating plans when sire breeds of several...
    Resource Type:
    Dissertation
    Full Text:
    Beef Cattle AN ABSTRACT OF THE THESIS OF STEPHEN EMIL CLARKE for the degree of DOCTOR OF PHILOSOPHY

  • The fatty acid composition of certain bovine tissues

    Creator:
    Thompson, Robert Charles, 1927-
    Abstract:
    In this study subcutaneous, inter- and intramuscular fats from 42 Hereford steers were analyzed for their fatty acid composition using gas-liquid chromatography. The same tissues were analyzed from one pair each of identical twins of Angus and Shorthorn breeding. Muscle and liver lipids from these latter four animals were fractionated...
    Resource Type:
    Dissertation
    Full Text:
    BOVINE TISSUES by ROBERT CHARLES THOMPSON A THESIS submitted to OREGON STATE UNIVERSITY in