Regulation of LH and GnRH secretion during prepubertal development in the bull calf

Persistent Link:
http://hdl.handle.net/10150/277009
Title:
Regulation of LH and GnRH secretion during prepubertal development in the bull calf
Author:
Rodriguez, Rafael Eduardo, 1963-
Issue Date:
1989
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
A series of experiments were conducted to investigate the regulatory mechanisms governing the absence of and the initiation of pulsatile pituitary LH secretion during the infantile and prepubertal periods of development in the bull calf. In the first experiment, patterns of hypothalamic GnRH secretion into hypophyseal portal vessels were measured in sixteen Holstein bull calves at 2, 5, 8 and 12 weeks of age. The results of this study correlated the attainment of an hourly rate of pulsatile GnRH release to the onset of prepubertal LH secretion. In the second experiment, nine Holstein bull calves were infused with exogenous GnRH (200 ng) on an hourly basis from 1 to 6 weeks of age. From this experiment, we were able to demonstrate that an hourly rate of pulsatile GnRH release stimulates the age-associated changes in the hypothalamic-pituitary axis necessary for initiating pituitary LH secretion during the transition from the infantile to prepubertal period of development.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Calves -- Development.; Cattle -- Fertility.; Luteinizing hormone.; Luteinizing hormone releasing hormone.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Animal Sciences
Degree Grantor:
University of Arizona
Advisor:
Wise, Mark E.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleRegulation of LH and GnRH secretion during prepubertal development in the bull calfen_US
dc.creatorRodriguez, Rafael Eduardo, 1963-en_US
dc.contributor.authorRodriguez, Rafael Eduardo, 1963-en_US
dc.date.issued1989en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractA series of experiments were conducted to investigate the regulatory mechanisms governing the absence of and the initiation of pulsatile pituitary LH secretion during the infantile and prepubertal periods of development in the bull calf. In the first experiment, patterns of hypothalamic GnRH secretion into hypophyseal portal vessels were measured in sixteen Holstein bull calves at 2, 5, 8 and 12 weeks of age. The results of this study correlated the attainment of an hourly rate of pulsatile GnRH release to the onset of prepubertal LH secretion. In the second experiment, nine Holstein bull calves were infused with exogenous GnRH (200 ng) on an hourly basis from 1 to 6 weeks of age. From this experiment, we were able to demonstrate that an hourly rate of pulsatile GnRH release stimulates the age-associated changes in the hypothalamic-pituitary axis necessary for initiating pituitary LH secretion during the transition from the infantile to prepubertal period of development.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectCalves -- Development.en_US
dc.subjectCattle -- Fertility.en_US
dc.subjectLuteinizing hormone.en_US
dc.subjectLuteinizing hormone releasing hormone.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineAnimal Sciencesen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorWise, Mark E.en_US
dc.identifier.proquest1336896en_US
dc.identifier.oclc22806581en_US
dc.identifier.bibrecord.b17504351en_US
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