Search Constraints

Start Over
Filtering by: Creator Griebeler, W. L. Remove constraint Creator: Griebeler, W. L. Advisor Bogart, Ralph Remove constraint Advisor: Bogart, Ralph

Search Results

  • 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

  • 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

  • Influence of chelating agents on cytological exchanges and genetic recombination in Zea mays L.

    Creator:
    Jones, Donald Dean
    Abstract:
    The present investigation with the chromosomes of Zea mays was conducted to determine: (1) the effects of chelating agents on the process of cytological exchange, and (2) the effects of chelating agents on genetic recombination. To ascertain the influence of chelating agents on cytological exchange, four known heterozygolis paracentric inversion...
    Resource Type:
    Dissertation
    Full Text:
    and genetic recombination in Zea mays L. AN ABSTRACT OF THE THESIS OF DONALD DEAN JONES for the

  • 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
    Full Text:
    of Graduate School Date thesis is presented 61 L; Typed by Sammy McMurphey for Larry Wayne Douglass

  • 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:
    based on the following index: 14 I=w -w+LS - L. 6 w crLS I = score. w = 28 -day weight of the

  • 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:
    suggestions throughout, contributed to the successful completion of this study. To Drs. F. L. Hisaw and K. J

  • Estimation of general and specific combining abilities from a diallel cross of three inbred lines of Suffolk sheep

    Creator:
    Schilling, Prentiss E. (Prentiss Edwin), 1941-
    Abstract:
    The investigations were based on a complete diallel cross among three inbred lines of Suffolk sheep. Line of sire effects were assumed to be an estimate of general combining ability effects while sire x dam interaction was assumed to be an estimate of specific combining ability. The line of dam...
    Resource Type:
    Dissertation
    Full Text:
    and advice given by Drs. Rod V. Frakes, Frederick L. Hisaw, Jr. and Lyle Calvin to the content of

  • 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:
    based on the following index: 14 I=w -w+LS - L. 6 w crLS I = score. w = 28 -day weight of the

  • Genetic polymorphism of sheep hemoglobin

    Creator:
    Templeton, Joe Wayne, 1941-
    Abstract:
    Five breeds of sheep (Columbia, Targhee, Rambouillet, Lincoln, and Suffolk) were found to possess two hemoglobin types (Hb. A and Hb. B) when their hemoglobins were examined by disc gel electrophoresis. The hemoglobin alleles proved to be co-dominant. Three of the breeds (Columbia, Targhee, and Rambouillet) were maintained at altitudes...
    Resource Type:
    Dissertation
    Full Text:
    it was inconvenient for them to do so. The author is grateful to Drs. E. J. Dornfeld, D. L

  • Actual and predicted response to selection on maternally influenced traits in the mouse

    Creator:
    Lind, Ronald Egnard
    Abstract:
    An experiment was conducted to determine if selection from standardized litters would be effective in separating lines of mice selected for increased and decreased litter weight at 14 days of age, and if response to selection on this maternally influenced trait could be accurately predicted. Data were collected on litter...
    Resource Type:
    Dissertation
    Full Text:
    committee members, Dr. Ralph Bogart, Dr. Rodney V. Frakes, Dr. F. L. Hisaw, Dr. Roger G. Petersen, Dr