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Filtering by: Alternative title ssim Report no. 1362 Remove constraint Alternative title ssim: Report no. 1362 Advisor Bogart, Ralph Remove constraint Advisor: Bogart, Ralph Language English [eng] Remove constraint Language: English [eng]

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  • Association of genetically determined polymorphic blood components with prolificacies of purebred and crossbred pigs

    Creator:
    Kray, Roger LeRoy
    Abstract:
    Crossmatings were accomplished among three semi-closed lines within a population of pigs, for the purpose of investigating effects of crossbreeding on reproductive traits. Two of the lines were purebred (Berkshire and Yorkshire); the third line ("Composite") consisted of descendants from inter se matings among offspring of crosses of the Berkshire...
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    Dissertation
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    breed (9.33 vs. 8.13). No difference between numbers born dead per litter was found for the two types

  • Serum T₄ and liver NAD and NADP as performance indicators in beef cattle

    Creator:
    Brokaw, Bryan Edward
    Abstract:
    The relationships of serum T₄ (thyroxine) levels and liver nicotinamide nucleotide coenzyme (NAD and NADP) levels with production of traits of beef cattle were investigated at both weaning (182 kg) and following performance testing (363 kg). In addition, the value of these parameters as selection criteria for improved performance was...
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    Dissertation
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    present in excess over NADH and NADP+ respectively. No significant differences in coenzyme concentrations

  • An analysis of the response to selection for high and low rate of gain in the mouse, Mus musculus

    Creator:
    Burrill, Melinda Jane
    Abstract:
    An experiment was conducted to examine the responses to selection for high and low rate of gain in the mouse under a system whereby inbreeding was maximized. Rate of gain was measured by an index designed to include gains in both the pre- and postweaning periods with the gains in...
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    Dissertation
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    , virtually no response to selec- tion for low index occurred. Responses of the component parts of the

  • 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...
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    Dissertation
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    - tively. There were no differences between high, low and control line progeny when they were reared by

  • Hormonal stimulation of breeding activity in different genetic groups of ewe lambs

    Creator:
    West, Dennis Errol, 1942-
    Abstract:
    An investigation of the effects of exogenous gonadotropic treatments on fertility of various genetic groups of ewe lambs were run over a six-year period. Since hormonal treatments varied and the experimental animals were different from one breeding season to the next, each year comprised a separate study. Hormone treatment included...
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    , histological examination of the reproductive tracts of treated and control ewe lambs were made. No differences

  • The relationship between x-ray induced teratogeny and chromosome aberrations in golden hamster embryos

    Creator:
    Jones, William Elvin
    Abstract:
    The relationship between x-ray induced chromosome aberrations and x-ray induced embryonic abnormalities was studied. Golden hamsters were irradiated during four stages of gestation: the blastocyst stage, 4.5 days post-copulation; the primitive streak stage, 6.5 days post-copulation; the organogenesis stage, 9.5 days post-copulation; and the period of fetal growth, 11.5 days...
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    responsible for the embryonic abnormalities but there is no correlation between the numbers of chromosome

  • 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...
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    Dissertation
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    electrocardio- grams were published since 1959. No record of studies involving electrocardiograms of dwarf

  • 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...
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    Dissertation
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    60-day body weight. The report covers 21 genera- tions of selection. By the twenty-first generation

  • 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...
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    Dissertation
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    components of carcass grade, percent drip, tenderness, juiciness and thyroid gland weight. No specific

  • 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...
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    Dissertation
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    are inherited as co-dominant autosomal allelic genes. No evidence was found to support a pre- vious