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dc.contributor.advisorSmith, Michael Fieldingeng
dc.contributor.authorAtkins, Jacqueline Anneeng
dc.date.issued2009eng
dc.date.submitted2009 Falleng
dc.descriptionThe entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract, appears in the public.pdf file.eng
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on January 25, 2011).eng
dc.descriptionThesis advisor: Dr. Michael F. Smith.eng
dc.descriptionVita.eng
dc.descriptionPh. D. University of Missouri--Columbia, 2009.eng
dc.description.abstractPrevious reports indicate that ovulation of small dominant follicles resulted in reduced pregnancy rates compared ovulation of large follicles in cattle. A reciprocal embryo transfer approach was used to differentiate between oocyte competence and uterine environment factors that affect establishment of pregnancy following induced single ovulations of small follicles. Embryos from donor cows that ovulated a small follicle ( [less than] 12.5 mm) were transferred into recipient cows that ovulated a large follicle ([equal to] 12.5 mm) and vice versa resulting in the following treatment groups: small to large (S-L; primary effects of oocyte quality; n = 111), large to small (L-S; primary effects of uterine environment; n = 122), small to small (S-S; negative control; n = 71), and large to large (L-L; positive control; n = 50). The probability of recovering a fertilized and live embryo 7 d after breeding increased as the diameter of the ovulatory follicle increased (p = 0.01). As ovulatory follicle diameter and serum concentrations of progesterone at embryo transfer increased in the recipient cow, the probability of pregnancy increased (p = 0.05 and [less than] 0.001, respectively); however neither follicle size nor progesterone at ET in the donor cow was significant (p [greater than] 0.3). In summary, ovulatory diameter at GnRH2 was positively associated with recovery of a live embryo (possibly indicating improved oocyte competence and (or) an early uterine environment that was more conducive to embryonic/fetal development in cows that ovulated a large follicle). Pregnancy establishment following embryo transfer was related to the uterine environment established by the ovulatory follicle independent of oocyte quality.eng
dc.description.bibrefIncludes bibliographical referenceseng
dc.format.extentxvi, 187 pageseng
dc.identifier.oclc698221034eng
dc.identifier.urihttps://doi.org/10.32469/10355/9885eng
dc.identifier.urihttps://hdl.handle.net/10355/9885
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.rightsOpenAccess.eng
dc.rights.licenseThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
dc.subject.lcshBeef cattle -- Pregnancyeng
dc.subject.lcshLuteal phaseeng
dc.subject.lcshBeef cattle -- Fetuses -- Mortalityeng
dc.titleEffect of ovulatory follicle size on luteal function, pregnancy rate, and late embryonic/fetal mortality in beef cattleeng
dc.typeThesiseng
thesis.degree.disciplineAnimal sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelDoctoraleng
thesis.degree.namePh. D.eng


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