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Filtering by: Creator Rickman, R. W. Remove constraint Creator: Rickman, R. W. Advisor Bogart, Ralph Remove constraint Advisor: Bogart, Ralph

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  • Estimates of combining abilities, heterotic effects and phenotypic correlations among in-bred lines of beef cattle and their line-crosses

    Creator:
    Humes, Paul Edwin
    Abstract:
    The investigations were based on a complete diallel cross among three inbred lines of Hereford cattle. Records of Angus calves born during the same period were used to obtain more accurate estimates of environmental effects and to determine breed differences among the various traits included in the study. Estimates of...
    Resource Type:
    Dissertation
    Full Text:
    members Dr, Rod V. Frakes, Fredrick L. Hisaw, Jr. and W. R. Furtick for the time and competent advice

  • Effectiveness of index and elite selection methods

    Creator:
    Douglass, Larry W.
    Abstract:
    Mice were used to compare the index and elite selection methods for simultaneous selection of four traits. Selection was for litter size, birth weight, weaning weight and post-weaning gain. Progress was evaluated by examining total phenotypic merit. The standard deviations from the cycle mean for the four traits were summed...
    Resource Type:
    Dissertation

  • Genetics of sheep transferrins as determined by disc electrophoresis

    Creator:
    Nix, Carroll Eugene
    Abstract:
    A total of 902 plasma samples from the Rambouillet, Targhee, Columbia, Lincoln, and Suffolk breeds of sheep were analyzed for transferrin type by disc electrophoresis. Six transferrin types, Tf[superscript A], Tf[superscript B], Tf[superscript C], Tf[superscript p], Tf[superscript E], and Tf[superscript P], were found in the Rambouillet, Targhee, and Columbia breeds...
    Resource Type:
    Dissertation
    Full Text:
    appreciated. Gratitude is expressed to committee members Dr. R. R. Becker, Dr. Paul Roberts, Dr. F. L. Hisaw

  • Genetic and physiological relationships of growth hormone and growth in goats

    Creator:
    Simms, Danny Dale
    Abstract:
    An F₁ population resulting from mating pygmy and normal goats (local commercial breeds) was crossed to give an F₂ population. Analysis of wither height and body weight indicated that the F₂ population was intermediate between the parental types (pygmy and normal) with little overlap of phenotypic values for body size...
    Resource Type:
    Dissertation
    Full Text:
    . Frakes, Donald L. MacDonald, and Morris W. Montgomery are gratefully acknowledged. These men and Drs

  • Effects of radiation on selection progress in mice

    Creator:
    Womack, James Ernest
    Abstract:
    The effects of x-irradiation on quantitative genetic traits was investigated by comparing the response of irradiated mice to selection for litter size and 28-day weight with the response to selection for the same two traits in non-irradiated lines. Irradiated lines were maintained at three levels of x-irradiation, 25 r, 50...
    Resource Type:
    Dissertation
    Full Text:
    . Irradiated lines were maintained at three levels of x- irradiation, 25 r, 50 r and 100 r, administered to

  • Effects of radiation on selection progress in mice

    Creator:
    Womack, James Ernest
    Abstract:
    The effects of x-irradiation on quantitative genetic traits was investigated by comparing the response of irradiated mice to selection for litter size and 28-day weight with the response to selection for the same two traits in non-irradiated lines. Irradiated lines were maintained at three levels of x-irradiation, 25 r, 50...
    Resource Type:
    Dissertation
    Full Text:
    . Irradiated lines were maintained at three levels of x- irradiation, 25 r, 50 r and 100 r, administered to

  • Electrocardiograms and related variables of dwarf beef cattle

    Creator:
    Pinjani, Moti, 1939-
    Abstract:
    Electrocardiograms from 12 compressed male (CM), 16 compressed female (CF), ten synthetic compressed female (SCF), nine brachycephalic female (BF), and 15 dolichocephalic female (DF) dwarfs from Davis, California, taken in the scapular lead S-II (prescapular position positive and right forelimb negative) were analyzed, The data on dwarf electrocardiograms were compared...
    Resource Type:
    Dissertation
    Full Text:
    ) during the W-P-W syndrome. The P-R interval was 0.20 second in the normal period and 0.10 second in the

  • Gonadotropins in pituitaries of inbred and linecross beef bulls and effects of irradiation of mammalian pituitary glands on their ability to induce in vitro ovulation of frog ovaries

    Creator:
    North, Warren Arthur
    Abstract:
    There were two studies involved in the thesis research. In the first study, variation in the amount of adenohypophysis gonadotropins among 22 individual beef bulls were investigated. These bulls represented four inbred lines, and six linecrosses. The bulls were raised in the Oregon State University purebred herd. The bulls were...
    Resource Type:
    Dissertation
    Full Text:
    when the pituitary- treated mice were compared with control mice, r% ¿/ ? / /,ñ /9 When the

  • Morphology of epididymal spermatozoa from inbred and linecross bulls

    Creator:
    Turner, H. A.
    Abstract:
    Data were presented on epididymal spermatozoa from 29 inbred and linecross bulls raised at Oregon State University in connection with the Western Regional Beef Cattle Breeding Project, W-1. The inbred bulls came from four inbred lines. Three of these inbred lines were Herfords and the other line was Angus. The...
    Resource Type:
    Masters Thesis
    Full Text:
    , J. W. , E. W. Hupp and R. L. Murphree. Effect of scrotal insulation on semen of Hereford bulls

  • Ova tranfers in sheep and rabbits : studies on material influences and irradiation damage

    Creator:
    Hunt, William Lynn
    Abstract:
    The first study utilized ova transfer in sheep and involved hormonal treatments for synchronization of estrus and superovulation in an investigation of crossbred maternal influences on inbred and linecross lambs. Synchronization of estrus in ewes was achieved effectively with either oral progestogen, 6 α-methyl-17α-hydroxy-progesterone acetate (60 mg./ewe/day), or intramuscular injections...
    Resource Type:
    Dissertation
    Full Text:
    rnm. A1., distance 37.4 cm., dose 14,5 r, /min. ), Ova were transferred into oviducts of prepared