dc.contributor.advisor | Smith, Michael Fielding | eng |
dc.contributor.author | Johnson, Cia L. | eng |
dc.date.issued | 2010 | eng |
dc.date.submitted | 2010 Spring | eng |
dc.description | Title from PDF of title page (University of Missouri--Columbia, viewed on June 14, 2010). | eng |
dc.description | The 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.description | Thesis advisor: Dr. Michael F. Smith. | eng |
dc.description | M.S. University of Missouri--Columbia 2010. | eng |
dc.description.abstract | The GnRH-induced ovulation of small dominant follicles was associated with reduced pregnancy rates and late embryonic/fetal survival around the time of embryo-uterine attachment. PAGs are secreted by binucleated trophoblast cells into the maternal circulation and have been used to monitor placental function and embryo/fetal mortality. The overall objective was to examine the relationship between ovulatory follicle size and circulating concentrations of bPAG. Postpartum cows were treated with the CO-Synch protocol and timed artificial insemination and classified into one of four groups based on the size of the follicle induced to ovulate at GnRH-2. There was an effect of treatment on pregnancy rates at d 30 post insemination with pregnancy rate being higher following GnRH-induced ovulation of 14 to 15 mm compared to 12 to 13 mm follicles. The first increase in bPAG occurred on d 24. There was an effect of day on bPAG but no effect of ovulatory follicle size or ovulatory follicle size by day interaction from d 20 to 60. Furthermore, there was an effect of month on bPAG but no effect of treatment or treatment by month interaction from 3 months of gestation to calving. In summary, there was no effect of ovulatory follicle size on serum concentrations of bPAG in pregnant cows. | eng |
dc.description.bibref | Includes bibliographical references. | eng |
dc.format.extent | xii, 88 pages | eng |
dc.identifier.merlin | b79329512 | eng |
dc.identifier.oclc | 648256665 | eng |
dc.identifier.uri | http://hdl.handle.net/10355/8069 | |
dc.identifier.uri | https://doi.org/10.32469/10355/8069 | eng |
dc.language | English | eng |
dc.publisher | University of Missouri--Columbia | eng |
dc.relation.ispartofcommunity | University of Missouri--Columbia. Graduate School. Theses and Dissertations | eng |
dc.rights | OpenAccess. | eng |
dc.rights.license | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License. | |
dc.subject.lcsh | Beef cattle -- Reproduction | eng |
dc.subject.lcsh | Luteinizing hormone releasing hormone | eng |
dc.subject.lcsh | Glycoproteins | eng |
dc.subject.lcsh | Ovulation | eng |
dc.title | Effect of ovulatory follicle size on bovine pregnancy associated glycoproteins in beef cattle | eng |
dc.type | Thesis | eng |
thesis.degree.discipline | Animal sciences (MU) | eng |
thesis.degree.grantor | University of Missouri--Columbia | eng |
thesis.degree.level | Masters | eng |
thesis.degree.name | M.S. | eng |