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Filtering by: Academic Affiliation Animal Science Remove constraint Academic Affiliation: Animal Science Subject Sheep -- Breeding Remove constraint Subject: Sheep -- Breeding

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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
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
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
Crossbred lamb production from Columbia and Suffolk ewes

Creator:

Levine, Joel Martin

Resource Type:

Masters Thesis
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

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Academic Affiliation

Animal Science[remove]5

Advisor

Ellington, Earl F.2
Bogart, Ralph1
Hohenboken, William D.1
Thomas, David L.1

Commencement Year

Commencement Year range begin – Commencement Year range end

Current results range from 1966 to 1983

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Creator

Collins, Debora Ann1
Dahmen, J. J. (Jerome John), 1919 1
Levine, Joel Martin1
Osland, Robert Birger1
Reeves, Jerry John1

Date

Date range begin – Date range end

Current results range from 1965 to 1982

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Decade

1980-19891
1970-19791
1960-19693

Degree Field

Animal Science5

Degree Level

Master's4
Doctoral1

Degree Name

Master of Science (M.S.)4
Doctor of Philosophy (Ph.D.)1

Language

English [eng]5

Non-Academic Affiliation

Oregon State University. Graduate School5

Peer Reviewed

No5

Resource Type

Masters Thesis4
Dissertation1

Rights Statement

Copyright Not Evaluated5

Subject

Sheep -- Breeding[remove]5
Estrogen1
Lambs1
Progesterone1

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