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Filtering by: Creator Breed, Greg A. Remove constraint Creator: Breed, Greg A. Advisor Hohenboken, William D. Remove constraint Advisor: Hohenboken, William D.

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  • Sheep breed evaluation : grazing behavior, condition scores and lamb production

    Creator:
    Berggren-Thomas, Bruce
    Abstract:
    I. The Effects of Sire Breed, Forage Availability and Weather on the Grazing Behavior of Crossbred Ewes. Thirty nonpregnant, nonlactating crossbred ewes, six per sire breed (Suffolk, Clun Forest, Dorset, Polypay and Border Leicester), were observed grazing together in a 0.87 ha grass-clover pasture for six days over a two-week...
    Resource Type:
    Masters Thesis
    Full Text:
    0.63 km PM). Sire breed had no effect on either grazing time or distance traveled. Weather had a

  • Evaluation of rabbit breeds and crosses for overall commercial productivity

    Creator:
    Lukefahr, Steven D.
    Abstract:
    In two breeding experiments, straightbred and crossbred rabbits were evaluated for performance characters relating to reproduction, disease resistance, growth and carcass quality. In the first experiment, New Zealand White CNN) and Flemish Giant (FG) straightbreds and FG sire x (Florida White-New Zealand White dam) terminal-crossbreds (TX) were involved. Reproductive performance...
    Resource Type:
    Dissertation

  • Breed and heterosis effects on wool and lamb production of rotationally crossed ewes

    Creator:
    Gallivan, Catherine Agnes
    Abstract:
    One thousand twenty-three lambing records of 351 ewes bred in a rotational crossbreeding system involving Columbia or Targhee, Hampshire and Finnish Landrace breeds were examined. A regression approach was used to determine the effects of breeds and heterosis on wool grade, greasy fleece weight, ewe weight at lambing, lambing date,...
    Resource Type:
    Masters Thesis
    Full Text:
    breed combinations will be the most effective in a given environment, it is necessary to know the

  • Mathematical modeling of selection and crossbreeding in beef cattle

    Creator:
    Clarke, Stephen Emil
    Abstract:
    A mathematical model was developed to simulate alternative selection and crossbreeding strategies for commercial beef production. Biological and economic constraints were selected to represent typical pasture production of calves in the Northwest. The crossbreeding study evaluated the relative economic efficiency of different 1) mating plans when sire breeds of several...
    Resource Type:
    Dissertation
    Full Text:
    decreased economic efficiency. The use of a very large terminal breed in the criss-out-cross or the three

  • Genotype x environment interactions in sheep

    Creator:
    Corum, Kathleen Steele
    Abstract:
    The 865 ewe production records taken from three lamb crops, were analyzed to study breed effects, heterosis, environmental effects and interactions between them, and breed and heterosis x environment interaction effects on ewe production traits. In each of two environments, approximately 144 ewes were mated in a three breed reciprocal...
    Resource Type:
    Masters Thesis
    Full Text:
    . Bibliography VIII. Appendices A. Breed Means for Fertility B. Breed Means for Ewe Production Traits C. Breed

  • Computer simulation of beef cattle production systems in the Llanos of Columbia

    Creator:
    Levine, Joel Martin
    Abstract:
    A simulation model capable of execution on a programmable calculator was developed to study voluntary intake, liveweight change, and fertility of grade Zebu cows in the Llanos of Colombia. Organic nitrogen in the diet and meta bolic weight were used to predict intake; age, liveweight, and energy concentration were the...
    Resource Type:
    Dissertation
    Full Text:
    herd with relatively low maintenance costs. In a more complicated simulation involving two-breed

  • Inheritance of maternal antibody concentration in the bovine neonate

    Creator:
    Muggli, Noelle Elizabeth
    Abstract:
    Serum samples were collected between 24 and 48 h of age from 408 Hereford calves of a selection experiment and from 200 Angus, Hereford and Red Poll calves of another experimental population (Germ Plasm Utilization project). Concentrations of Immunoglobulin G₁ (IgG₁) were determined by single radial immunodiffusion. Breed or selection...
    Resource Type:
    Masters Thesis
    Full Text:
    serum IgG1 concentration, estima- ted from paternal half-sib analysis on a within line or breed basis

  • Population analysis of a commercial beef cattle herd

    Creator:
    Schons, Debra Jo
    Abstract:
    Twenty-four years of records (1958-1981) from a commercial Angus ranch were utilized in a population analysis to characterize the herd as a biological unit. The herd averaged 632±129 cows and 123±6 replacement heifers with all replacement heifers and many bulls from within the herd. Life tables were calculated for seven...
    Resource Type:
    Masters Thesis
    Full Text:
    to characterize a breed for the purpose of organizing breeding schemes (Wiener, 1961; Lauvergne et

  • Genetic and environmental differences in age at first estrus and in wool and lamb production of crossbred ewe lambs

    Creator:
    Cedillo, Rose Mary
    Abstract:
    Genetic and environmental factors affecting age of first estrus, wool production, reproduction and lamb production were examined in eight groups of crossbred ewe lambs from two birth years. The 399 ewe lambs whose first year production was analyzed were from eight crossbred groups resulting from mating North Country Cheviot, Dorset,...
    Resource Type:
    Masters Thesis
    Full Text:
    and Laster (1975) reported that the breed of a 5 crossbred ewe's dam but not the age of her dam

  • Sheep selection in retrospect

    Creator:
    Saoud, Nabeel B.
    Abstract:
    A total of 399 crossbred ewes from two birth years were raised under two management systems, irrigated vs. dryland hill pastures. The crossbred ewes were sired by North Country Cheviot, Dorset, Finnsheep and Romney rams that were mated to Suffolk and Columbia-type ewes. Hampshire rams were the terminal sire breed...
    Resource Type:
    Dissertation
    Full Text:
    in 1973, approximately 80% from each breed group were retained (a total of 194 ewes) for mating