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  • Genetic and environmental influences upon litter size and variation of birth weights in Berkshire swine

    Creator:
    Chapman, Verne Merrill
    Abstract:
    Litter site and birth weight data compiled from the farrowing records of 275 litters out of 109 purebred Berkshire sows of the Oregon State University swine herd during the years 1953 to 1960 inclusive were used in this study. Genetic and environmental factors influencing four components of reproductive performance, namely,...
    Resource Type:
    Masters Thesis
    Full Text:
    ACKNOWLEDGEMENTS The writer wishes to express his sincere thanks and gratitude to Dr. David C. England

  • Selection for hybrid female reproductive performance in the mouse

    Creator:
    Chapman, Verne Merrill
    Abstract:
    The design of this study was suggested by the following observations: (1) the successful application of recurrent selection techniques in obtaining improvement of hybrid performance in corn and Drosophila, (2) the increased production realized by rotational crossbreeding, and (3) the expression of a relatively large degree of hybrid vigor in...
    Resource Type:
    Dissertation
    Full Text:
    and significant learning experiences and I would like to thank Dr. David C. England for the