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The effect of levels of inbreeding of dam and offspring upon performance of purebred suffolk lambs

Creator:: England, Noah Clinton
Resource Type:: Masters Thesis
Full Text:: transmitted with a high degree of predictability--some combination of closed herd breeding and selection

Some genetic and environmental factors affecting weaning weights of lambs

Creator:: Dahmen, J. J. (Jerome John), 1919-
Abstract:: Eight purebred rams (four Suffolk and four Panama) previously selected as high and low on the basis of post-weaning performance feed test of 84 days were used each of three years. Each of the rams was mated to approximately 25 grade Panama ewes each year. One ram and 25 ewes...
Resource Type:: Dissertation
Full Text:: produce these in quantity and quality have economic value in breeding for sheep im- provement. Weaning

Some hormonal factors associated with the regulation of ewe reproductive patterns

Creator:: Reeves, Jerry John
Abstract:: Twenty-eight Columbia ewes were made available for study during their breeding and anestrous seasons. After the regularity of the estrous cycles had been established, eight of the ewes were sacrificed in pairs at four different stages of the estrous cycle. Eight additional ewes were sacrificed during anestrus. Pituitary glands, ovaries,...
Resource Type:: Masters Thesis
Full Text:: approximately the midpoint of the breeding season for the ewe. The domestic sheep is a seasonally

Crossbred lamb production from Columbia and Suffolk ewes

Creator:: Levine, Joel Martin
Resource Type:: Masters Thesis
Full Text:: . Ewe Production and Lamb Traits II. Simulation of the Sheep Flock: Net Income Per Ewe AN ABSTRACT OF

Regulation of ovine pituitary function with estrogen alone and in combination with progresterone

Creator:: Osland, Robert Birger
Abstract:: Five experiments were conducted to study the activity of the pituitary gland in sheep as influenced by estrogen administered alone or in combination with progesterone. Particular emphasis was given to the study of gonadotropic activity. Mature wethers (experiments I, III, IV and V) or ewes (experiment II) were utilized as...
Resource Type:: Masters Thesis
Full Text:: study the activity of the pituitary gland in sheep as influenced by estrogen administered alone or in

Genetic polymorphism of sheep hemoglobin

Creator:: Templeton, Joe Wayne, 1941-
Abstract:: Five breeds of sheep (Columbia, Targhee, Rambouillet, Lincoln, and Suffolk) were found to possess two hemoglobin types (Hb. A and Hb. B) when their hemoglobins were examined by disc gel electrophoresis. The hemoglobin alleles proved to be co-dominant. Three of the breeds (Columbia, Targhee, and Rambouillet) were maintained at altitudes...
Resource Type:: Dissertation
Full Text:: Columbia breeds were developed at the U. S. Sheep Breeding Station from crosses of Lincoln X Rambouillet

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...
Resource Type:: Dissertation
Full Text:: breeding sys- tem used at the U. S. Sheep Experiment Station as this involves a major part of the study

Effects of sire breed on growth, feed efficiency, and carcass traits of cross-bred lambs slaughtered at three weights

Creator:: Collins, Debora Ann
Abstract:: This study examined the effects of sire breed and weight on the performance of 117 crossbred wether lambs born at the Oregon State University Agricultural Experiment Station, Corvallis. Lambs were produced by mating Clun Forest,Polypay, Dorset, Border Leicester, and Suffolk sires to Columbia-type ewes. After weaning at approximately 90 days...
Resource Type:: Masters Thesis
Full Text:: review of sheep crossbreeding studies by Nitter (1978) indicated that crossbreeding systems generally

Genetic and environmental variation in production components of purebred and crossbred ewes

Creator:: Nawaz, Mohammad, 1957-
Abstract:: Coopworth sheep, a newly available genotype, were compared with other genotypes in two trials to assess cumulative lamb and wool production and contributing components related to survival, reproduction and growth, and for the effects of ewe body weight on reproductive traits. In a third trial, various genotypes generated in the...
Resource Type:: Dissertation
Full Text:: approved: Howard IV Meyer Coopworth sheep, a newly available genotype, were compared with other

The inheritance of medullation in wool

Creator:: Young, Sing Sze
Resource Type:: Masters Thesis
Full Text:: Blaokface sheep. That the hereditary factor Is the cause of medullated. fibers is partially vers fled by

ScholarsArchive@OSU

The effect of levels of inbreeding of dam and offspring upon performance of purebred suffolk lambs

Some genetic and environmental factors affecting weaning weights of lambs

Some hormonal factors associated with the regulation of ewe reproductive patterns

Crossbred lamb production from Columbia and Suffolk ewes

Regulation of ovine pituitary function with estrogen alone and in combination with progresterone

Genetic polymorphism of sheep hemoglobin

Genetics of sheep transferrins as determined by disc electrophoresis

Effects of sire breed on growth, feed efficiency, and carcass traits of cross-bred lambs slaughtered at three weights

Genetic and environmental variation in production components of purebred and crossbred ewes

The inheritance of medullation in wool

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