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dc.contributor.advisorHarms, Paul
dc.creatorOwens, Robert Ellis
dc.date.accessioned2020-01-08T17:40:58Z
dc.date.available2020-01-08T17:40:58Z
dc.date.created1981
dc.date.issued1981
dc.identifier.urihttp://hdl.handle.net/1969.1/DISSERTATIONS-83384
dc.descriptionIncludes bibliographical references (leaves 52-58)en
dc.description.abstractA study was designed to evaluate the pulsatile patterns of plasma LH in five mature Jersey cows on day 3 of two consecutive estrous cycles, and at different time intervals following ovariectomy (4, 42 and >59 days postovariectomy). The patterns of LH from these bleeding periods were compared to determine if individual animals have inherent patterns of LH release from the pituitary when ovarian steroid feedback is minimal or absent. Additionally, these bleeding periods served as a time study of the effect of ovariectomy on the pulsatile patterns of LH. The animals were also used to study the feedback effects of progesterone on the patterns of plasma LH in short-term (11 days postovariectomy) and long-term (49 days post-ovariectomy) ovariectomized cows. A final study was performed to determine if a combination of estrogen with progesterone might enhance any feedback effect of progesterone. Ovarian steroids were administered with a Progesterone Releasing Intravaginal Device (PRID) which was inserted one week before the scheduled bleeding periods. Blood samples were collected from an indwelling jugular cannula at 10-min intervals during each of the bleeding periods. Concentrations of plasma LH and progesterone were quantitated by validated radioimmunoassays. No apparent inherent pattern of plasma LH was observed within individual cows when ovarian steroid feedback was minimal or absent, suggesting that the mechanism controlling pulsatile LH release is more complex than simple addition or removal of ovarian steroids. ...en
dc.format.extentxii, 105 leaves : illustrationsen
dc.format.mediumelectronicen
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectPhysiology of Reproductionen
dc.subject.classification1981 Dissertation O75
dc.subject.lcshEndocrinologyen
dc.subject.lcshCattle--Reproductionen
dc.subject.lcshOvariesen
dc.subject.lcshGonadotropinen
dc.subject.lcshPhysiology of Reproductionen
dc.titleEffect of ovariectomy and ovarian steroid replacement of patterns of plasma LH in the bovineen
dc.typeThesisen
thesis.degree.grantorTexas A&M Universityen
thesis.degree.nameDoctor of Philosophyen
thesis.degree.levelDoctoralen
thesis.degree.levelDoctorialen
dc.contributor.committeeMemberFleeger, J. L.
dc.contributor.committeeMemberMcArthur, N. H.
dc.contributor.committeeMemberTsutsui, E. A.
dc.type.genredissertationsen
dc.type.materialtexten
dc.format.digitalOriginreformatted digitalen
dc.publisher.digitalTexas A&M University. Libraries


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