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dc.contributor.authorCrawford, Janet L.
dc.date.accessioned2011-08-29T00:36:55Z
dc.date.available2011-08-29T00:36:55Z
dc.date.issued1993
dc.identifier.urihttps://hdl.handle.net/10182/3816
dc.description.abstractThis experiment was conducted to investigate the effect oestrogens have upon thyroid and pituitary responsiveness to stimulation by thyrothropin-releasing hormone (TRH) in the red deer (Cervus elaphus) hind. The first group of hinds, consisting of three ovariectomized and three entire hinds, were subjected to a TRH challenge (5 µl TRH in 2 ml saline solution) at 0800 h on 17 March 1993. Blood samples were collected at -60, -30, -15, 0, 5, 10, 15, 30, 45, 60, 90 and 120 minutes after the TRH injection. This procedure was repeated on a second group of hinds, consisting of three ovariectomized and three entire hinds, at 0810 h the following day. The entire group of hinds (n=6) exhibited a significantly higher mean plasma T₃ response to the TRH challenge compared with that of the ovariectomized group of hinds (peak values = 2.86 ± 0.55 ng.ml⁻¹ and 2.61 ± 0.55 ng.ml⁻¹ respectively). The ovariectomized hinds had a non-significantly higher mean basal T₃ concentration compared with that of the entire hinds before the TRH challenge (2.32 ± 0.63 ng.ml⁻¹ and 2.18 ± 0.40 ng.ml⁻¹ respectively). The entire hinds also exhibited a significantly higher mean plasma prolactin response compared with that of the ovariectomized hinds (42.70 ± 65.62 ng.ml⁻¹ and 7.33 ± 17.82 ng.ml⁻¹ respectively), however there was no significant difference between the mean plasma basal prolactin concentrations between the two groups before the TRH challenge. There was no significant response of mean plasma LH concentrations in either the ovariectomized or entire group of hinds after the TRH challenge. However there was a small non-significant rise in mean plasma LH concentrations immediately following the TRH injection in both the ovariectomized and entire group of hinds. In conclusion, results from this study demonstrate that oestrogens enhance the thyroid glands and pituitary gland respo~siveness to TRH with respect to T₃ and prolactin release respectively in the red deer hind.en
dc.language.isoenen
dc.publisherLincoln Universityen
dc.rights.urihttps://researcharchive.lincoln.ac.nz/page/rights
dc.subjectred deeren
dc.subjectCervus elaphusen
dc.subjecthindsen
dc.subjectovariectomizeden
dc.subjectoestrogensen
dc.subjectTRHen
dc.subjectT3en
dc.subjectprolactinen
dc.subjectLHen
dc.titleReproduction and thyroid function in red deer (Cervus elaphus) hindsen
dc.typeDissertationen
thesis.degree.grantorLincoln Universityen
thesis.degree.levelOtheren
thesis.degree.nameBachelor of Scienceen
lu.thesis.supervisorBarrell, Graham
lu.contributor.unitDepartment of Agricultural Sciencesen
dc.rights.accessRightsDigital thesis can be viewed only by current staff and students of Lincoln University.en
dc.subject.anzsrc070206 Animal Reproductionen


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