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  • Reproductive characteristics of two breeds of swine fed dichlorvos

    Creator:
    Trindade, Roger James
    Abstract:
    Thirty-six gilts were used in an experiment of 2³ factorial design. The experiment consisted of two breeds (Yorkshire- Berkshire and Yorkshire), two feeding regimens (pre-breeding and post-breeding) and two levels of dichlorvos (2, 2-dichlorovinyl dimethyl phosphate, 0 and 800 mg. per gilt per day). Pre-breeding treatment consisted of feeding dichlorvos...
    Resource Type:
    Masters Thesis
    Full Text:
    ovulations. Table 3. Ovarian characteristics (mean a S. E.) Treatment Breed No. of C. L. Total C. L. Wt

  • Sources of influence on passive and active immunoglobulin G responses in swine

    Creator:
    Chitko, Carol G.
    Abstract:
    Thirty-seven Yorkshire sows were bred to one of six boars; 34 of the sows were verified pregnant at 42 d of gestation. These sows were innoculated with ovine serum albumin (OSA) in Freunds' complete adjuvant at 65 d and later given a second injection in Freunds.' incomplete adjuvant 93 d....
    Resource Type:
    Masters Thesis
    Full Text:
    - finement. Females were bred according to a three-way rota- tional within-breed line cross and were hand

  • Genetic components of genetic influence on traits of purebred and crossbred populations of swine of Berkshire and Yorkshire origin

    Creator:
    Bellatty, Paul T.
    Abstract:
    Purebred and crossbred litters of Yorkshire and Berkshire breeds of swine were evaluated for number of piglets born alive per litter, number of piglets weaned per litter, mean piglet birth weight, mean piglet birth weight adjusted for number of piglets born alive per litter and mean piglet weaning weight. The...
    Resource Type:
    Dissertation
    Full Text:
    Whitehill clan, Jim and Pam, Marg and Greg, Doug, and Nathan and Stacey. A special thanks is extended to

  • Management techniques for induction and synchronization of estrus in prepuberal gilts in confinement

    Creator:
    Schiemann, Calvin Aloysius
    Abstract:
    At weights of 81.5-90.5 kg, 187 prepuberal crossbred gilts were subjected to specific environmental stimuli, for up to 17 days, to determine which stimuli or combinations of various ones would initiate onset of estrus in prepuberal gilts. The stimuli used were: movement to new building, mixing or non-mixing of gilts,...
    Resource Type:
    Masters Thesis
    Full Text:
    provides a reliable means of synchronizing breed- ing of the sows for a subsequent synchronized farrowing

  • The influence of heredity and some environmental components on occurrence of puberty in gilts in confinement

    Creator:
    Walker, Calvin
    Abstract:
    In a swine production and breeding experiment, Yorkshire gilts were evaluated for the influences of heredity-and some environmental components on occurrence of puberty in gilts in confinement. In the first experiment, 186 Yorkshire gilts reared and maintained in total confinement were used in a study to assess effects of several...
    Resource Type:
    Dissertation
    Full Text:
    , within a breed population, as a cause variation in per- centage of gilts reaching puberty in a given

  • Cycling and reproductive phenomena in gilts

    Creator:
    Knott, Robert Edward
    Abstract:
    Purebred Yorkshire gilts from a confinement managed herd were reared to test weights away from the sow and boar herd. Thirty-eight gilts weighing between 73 and 80 kilograms constituted group A gilts; 38 gilts weighing between 91 and 100 kilograms constituted group B gilts; and 47 gilts weighing 114 kilograms...
    Resource Type:
    Masters Thesis
    Full Text:
    mated to boars of a third breed had a significantly greater embryo survival (34.4 versus 78.8 percent

  • The relationship of blood glucose levels to ovulation rate and early embryonic mortality in gilts

    Creator:
    Day, Paul E.
    Abstract:
    A study was made of blood glucose levels and their relationship to reproduction in gilts. Twelve blood samples, two in each of three successive weeks, before and after breeding were taken. Half of the samples were obtained from gilts in a fasting state and half after feeding. All samples were...
    Resource Type:
    Masters Thesis
    Full Text:
    MORTALITY IN GILTS c:-Redacted for Privacy Abstract approved: David C. E land A study was made of blood

  • 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:
    rotational cross in which daughters of a cross between two breeds are mated to males of a third breed

  • Reproductive and litter performance of sows mated during lactation

    Creator:
    Walker, Calvin
    Abstract:
    An experiment was conducted with 51 control and 51 experimental confinement- managed purebred Yorkshire sows of various parities to (1) determine whether confinement-managed sows during lactation would exhibit estrus, mate, and conceive as a consequence of a daily regimen of a short period of separation from their litters, mixing sows...
    Resource Type:
    Masters Thesis
    Full Text:
    , and conceive as a consequence of a daily regimen of a short period of separation from their litters

  • Litter productivity at first and second parity by gilts mated at different weights at first or second estrus

    Creator:
    Tachasirinugune, Sommai
    Abstract:
    Purebred Yorkshire gilts with weights ranging from 70 to 105 kilograms were moved from a total-confinement rearing unit to a total-confinement brood stock unit where approximately ten gilts per pen were mixed to provide new penmates. Each gilt was thus exposed to an unfamiliar environment and to foreign penmates along...
    Resource Type:
    Masters Thesis
    Full Text:
    boars of a third breed had a significantly greater embryo survival rate than did purebred gilts mated