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The effects of inbreeding in a flock of Hampshire sheep

Creator:: Lamberson, William Russell
Abstract:: A registered flock of Hampshire sheep that had been predominantly closed for approximately 30 years was utilized to study the effects of inbreeding on productivity of the 1980 and 1981 lamb crops. Five generation pedigrees for ewes and rams were used to calculate inbreeding coefficients. The median inbreeding coefficient of...
Resource Type:: Masters Thesis
Full Text:: period and for his continuing friendship. I thank my committee members, Drs. William D. Hohenboken and

Quantitative and molecular genetics of larval susceptibility to Vibrio tubiashii in Pacific oysters (Crassostrea gigas)

Creator:: Chen, Chao
Abstract:: Vibriosis caused by the bacterial pathogen Vibrio tubiashii is one of several factors contributing to mass larval mortalities of the Pacific oyster (Crassostrea gigas) in Pacific Northwest shellfish hatcheries in recent years. Genetically improved strains of the Pacific oyster resistant to V. tubiashii would be highly desirable. This study investigates...
Resource Type:: Dissertation
Full Text:: Oysters (Crassostrea gigas) Abstract approved: John Killefer, William D. Hohenboken

Methods of evaluation, effects of intermating and results of one cycle of S₁ family recurrent selection in barley

Creator:: Mareck, James
Abstract:: The focus of this study was to determine if S₁ family recurrent selection might be successfully used for barley improvement. Objectives were: 1) to identify suitable methods of evaluating grain yield in small plots, 2) to study the effects of intermating on mean values and variances of selected agronomic characters,...
Resource Type:: Dissertation
Full Text:: to thank my graduate committee: Drs. William D. Hohenboken, Willis L. McCuistion, David L. Willis

Nature of inheritance, genotype-environment interaction and association of selected agronomic characters in crosses of winter X spring wheats (triticum aestivum L. em Thell)

Creator:: Brajcich, P.
Abstract:: This investigation was motivated by the apparent increase in genetic variability resulting from the systematic combining of gene pools represented by winter and spring types of wheats. It was the objective of this study to provide information regarding the nature of this genetic variability for nine agronomic characters in populations...
Resource Type:: Dissertation
Full Text:: preparation of this thesis. Appreciation is extended to Drs. Fred A. Cholick, Robert L. Powelson, William D

Single gene effects in chickens (Gallus gallus domesticus)

Creator:: Sadjadi, Morteza
Resource Type:: Dissertation
Full Text:: due to my graduate committee mem- bers, Drs. George H. Arscott, William D. Hohenboken, Kenneth E

Influence of competition on combining ability estimates and subsequent prediction of progeny performance in wheat (Triticum aestivum L. em Thell.)

Creator:: Corral, Leonardo R.
Resource Type:: Dissertation
Full Text:: also want to express my appreciation to Drs. William D. Hohenboken, Willis L. McCuistion, Dallice I

Factors affecting semen quality and their effects on the fertilizing ability of broiler breeder spermatozoa using a fluorometric assay

Creator:: Bootwalla, Salim Mohsin
Abstract:: Three distinct studies using an ethidium bromidedigitonin fluorometric assay were conducted to determine if the fertilizing ability of individually caged broiler breeder males (BBM) could be enchanced by nutrition, breeding and semen extender viscosity. The first study evaluated the effects on the spermatozoal quality of BBM by feeding corn-soybean meal...
Resource Type:: Dissertation
Full Text:: extended to Drs. George H. Arscott, Harry S. Nakaue, William D. Hohenboken, and David R. Thomas for their

Genetic considerations in cloning western hemlock

Creator:: Foster, George Samuel
Abstract:: Using clones to regenerate a species new to clonal reforestation presents the forest manager with many problems. A number of interrelated and interdependent research and development activites are needed to answer these technical questions. Network diagraming was used for scheduling research activities and for indicating interdependencies among activities. The resultant...
Resource Type:: Dissertation

Patterns of genetic variation within and among breeding zones of Douglas-fir in southwest Oregon

Creator:: Loopstra, Carol Anne
Abstract:: Three hundred fifty families from 11 breeding zones in southwest Oregon were grown in a common garden in Corvallis, Oregon, and patterns of genetic variation for seed weight and six first-year seedling characteristics were described. For most characteristics, large differences among breeding zones were found along an east-west transect, with...
Resource Type:: Masters Thesis

Perinatal mortality and preweaning growth of progeny of ewe lambs

Creator:: Gendron, Eric
Abstract:: Half Polypay ewe lambs were bred to Suffolk, North Country Cheviot and Hampshire rams to lamb at about one year of age. Type of birth-rearing significantly affected mortality by 70 days of age and all weights of lambs from birth to weaning. The mortality rate at 70 days of age...
Resource Type:: Masters Thesis
Full Text:: , whose encour- agement and friendship are most appreciated. Dr. William Hohenboken, Dr. Warren Kronstad

ScholarsArchive@OSU

The effects of inbreeding in a flock of Hampshire sheep

Quantitative and molecular genetics of larval susceptibility to Vibrio tubiashii in Pacific oysters (Crassostrea gigas)

Methods of evaluation, effects of intermating and results of one cycle of S₁ family recurrent selection in barley

Nature of inheritance, genotype-environment interaction and association of selected agronomic characters in crosses of winter X spring wheats (triticum aestivum L. em Thell)

Single gene effects in chickens (Gallus gallus domesticus)

Influence of competition on combining ability estimates and subsequent prediction of progeny performance in wheat (Triticum aestivum L. em Thell.)

Factors affecting semen quality and their effects on the fertilizing ability of broiler breeder spermatozoa using a fluorometric assay

Genetic considerations in cloning western hemlock

Patterns of genetic variation within and among breeding zones of Douglas-fir in southwest Oregon

Perinatal mortality and preweaning growth of progeny of ewe lambs

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