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Dissertations / Theses on the topic 'Sheep – Reproduction – Endocrine aspects'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

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1

Ferasyi, Teuku Reza. "Mathematical model of the reproductive endocrine system in male sheep." University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0080.

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[Truncated abstract] The activity of the reproductive endocrine axis is the result of interactions among many organs and tissues, particularly the hypothalamus, pituitary gland and gonad. However, it depends on more than the communication between anatomical structures because it is also affected by genotype, internal factors (e.g., metabolic inputs) and external factors (e.g., photoperiod, socio-sexual cues, stress, nutrition). This multifactorial complexity makes it difficult to use animal experimentation to investigate the pathways and mechanisms involved. Therefore, in this study, I have tu

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2

Melnyk, Peter M. (Peter Michael). "Estrogen regulation of testicular function in the adult ram." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59414.

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During the nonbreeding season (July), three groups of five Dorset x Leicester x Suffolk rams were assessed over a period of 5 days. One group of rams (control) was implanted (sc) with five 5cm empty Silastic capsules (i.d. 3.4mm, o.d. 4.6mm); two other groups, designated as Low-E$ sb2$ and High-E$ sb2$, received five estradiol filled capsules of either 5cm or 10cm, respectively for 4 days. Estradiol treatment elevated serum estradiol concentration about 150% in the Low-E$ sb2$ groups (15.7 $ pm$ 1.3 pg/ml) and 300% in the High-E$ sb2$ groups (26.6 $ pm$ 2.4 pg/ml) compared with controls (6.3 $

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3

Zhang, Song. "Peripheral and central pathways linking metabolic status and reproduction in male sheep." University of Western Australia. School of Animal Biology, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0037.

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[Truncated abstract] Reproductive activity is affected by external factors such as photoperiod, social cues, stress and nutrition, all of which can alter the pulsatile activity of the GnRH neurons, which is the major neuroendocrine system used by the brain to control gonadal function. In the male Merino sheep, nutrition is one of the most powerful factors that affect pulsatile LH secretion, used commonly to bioassay GnRH neuronal activity. More accurately, the reproductive system responds to “metabolic status”, rather than “nutrition”, and the three factors that contribute to metabolic status

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4

Earl, Colin R. "The regulation of the timing of melatonin secretion in the sheep." Title page, summary and table of contents only, 1989. http://web4.library.adelaide.edu.au/theses/09PH/09phe12.pdf.

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Includes bibliographical references (leaves 166-195) Addresses the nature of the central mechanisms involved in the regulation of the circadian pattern of secretion of the pineal hormone melatonin in the highly seasonal Suffolk breed of sheep. Provides new information on the behaviour of the onset and offset of melatonin secretion under different photoperiodic conditions.

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5

Archer, Zoe Anne. "Neuroendocrine control of appetite and reproduction in sheep." Thesis, University of Aberdeen, 2001. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602029.

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Reproductive neuroendocrine activity and appetite are modulated at the hypothalamus by both nutritional status and photoperiod in the seasonal animal. The objectives of this work were (1) to measure circulating hormones and/or metabolites that relay information about peripheral nutritional status to the hypothalamus, (2) to identify which hypothalamic neuropeptides and receptors that are responsive to photoperiodic and nutritional feedback and (3) to establish which changes in peripheral signals and/or hypothalamic neuropeptides are associated with alterations in the activity of the reproducti

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6

Nassiri, Mohammad Taghi Beigi. "Aspects of prolificacy in Cambridge sheep." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321435.

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7

Pryor, Andrew William. "Reproduction and Endocrine Aspects of Early and Mid Lactation Holstein Cows." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/32486.

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This study was designed to determine the effects of stage of lactation and subsequent energy status on metabolic and endocrine measures, follicular development, and the quality of oocytes obtained from Holstein cows. Holstein cows were selected prior to calving and assigned to the early lactation (EL) group (n=8) while, cows at d 90 postpartum were selected for the mid-lactation (ML) group (n=7). Blood samples were taken twice weekly from 4 wk prior to the start of follicular aspirations and then on through the aspiration periods for metabolite and hormone determination. Ultrasound-guided tr

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8

Hamudikuwanda, Humphrey. "Endocrine and metabolic mediators of dietary energy status and reproduction in dairy cows." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28770.

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Five experiments were undertaken to identify metabolites and hormones that could mediate the effect of dietary energy status on reproduction, particularly pulsatile secretion of luteinizing hormone (LH) postpartum dairy cows.<br>In the first two experiments, the concentration of progesterone (P4) in tailhead adipose tissue and plasma in 12 cows at different stages of pregnancy and lactation was determined as was P4 produced in vitro by explants of tailhead adipose tissue. Concentration of P4 in adipose tissue was correlated with that of plasma P4 near estrus and during the luteal phase of the

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9

Cassidy, Carrie. "Further evidence that prostaglandin F2-alpha is the obligatory eicosanoid in porcine ovulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0004/MQ44139.pdf.

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10

Cote, Fabienne. "Induction of prostaglandin endoperoxide synthase 2 in the follicles of equine chorionic gonadotropinhuman chorionic gonadotropin treated prepubertal gilts." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33741.

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Prostaglandin G/H synthase-2 (PGHS-2) is a key rate limiting enzyme in the prostaglandin (PG) biosynthetic pathway, and PG synthesis is required for ovulation in pigs. The objective of this study was to characterize the expression and regulation of PGHS-2 in porcine follicles prior to ovulation. The combination of equine chorionic gonadotropin (eCG; 750 IU) followed by human chorionic gonadotropin (hCG; 500 IU) 72 h later was used to induce ovulation in prepubertal gilts. Previous studies have shown that ovulation is generally induced between 40 and 44 h post-hCG in this model. Ovariectomies w

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11

Algire, James Edgar. "Prostaglandins in follicular development and ovulation in cattle." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61849.

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12

Mootoo, Judy E. (Judy Elizabeth). "Lipoxygenase metabolites of arachidonic acid in the porcine ovulatory process." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22779.

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It is widely accepted that prostaglandins (PGs), produced via the cyclooxygenase pathway from arachidonic acid, are essential to the ovulatory process in the pig. In support of this, ovulation is preceded by an increase in follicular fluid (FF) PG concentration, indomethacin (INDO) suppresses both the PG increase and ovulation, and ovulation can be restored by administration of exogenous PGs (Downey and Ainsworth, 1980; Prostaglandins 19: 17-22). Recent studies in the rat have shown that ovulation is also preceded by a rise in ovarian concentrations of 15-hydroxyeicosatetraenoic acid (15-HETE)

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13

Grant, Gerald F. "The association between prostaglandins and the plasminogen activator/plasmin system in the porcine ovulatory process /." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69759.

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The objectives were: (1) to determine the pre-ovulatory changes in plasminogen activator (PA) and (PA) inhibitor (PAI) activities in the porcine follicle, and, (2) to determine if changes in the PA/plasmin system associated with ovulation were prostaglandin (PG)-dependent. PA activity (change in absorbance/h/mg wet tissue weight, three gilts per treatment group) was elevated in both granulosa cells (GC) and theca interna cells (TIC) prior to human chorionic gonadotropin (hCG) administration (0.582 $ pm$ 0.171 and 0.718 $ pm$ 0.221, respectively) but returned to basal levels in these two compar

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14

Kwan, Ivy. "The effect of ACTH and steroidal antiinflammatory agents on prostaglandin F2a levels in vivo and in vitro using a spontaneously established porcine granulosa cell line /." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61233.

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In vivo experiments were conducted to determine if elevated plasma glucocorticoid concentrations would suppress intrafollicular prostaglandin F2$ alpha$ (PGF2$ alpha$) synthesis and, thereby, inhibit ovulation in the pig. Following ACTH administration, PGF2$ alpha$ concentrations in FF tended to be lower than in controls. Injections of betamethasone partially suppressed the preovulatory rise of PGF2$ alpha$ in FF at 40h, although the effect was less marked than that produced by indomethacin. While no ovulations occurred in the indomethacin-treated group at any time, betamethasone resulted in a

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15

Krown, Kevin Alan. "Pituitary changes in force-molted hens." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185205.

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The effect of forced molt on pituitary function and other endocrine parameters was investigated in three year old hens subjected to a dietary forced molting procedure. In addition to molting, fasting caused cessation of egg production, body and organ weight loss, alterations in hormone secretion and morphological changes in some endocrine glands. Body and ovary weights decreased but returned to normal with ad libitum feeding. Pituitary, thyroid and adrenal weights were not affected but serum hormone levels measured by RIA revealed a decrease in LH, FSH and PRL and increases in TSH, T₃ and GH a

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16

Spaulding, Benjamin W. "Endocrine Disruption in Atlantic Salmon (Salmo salar) Exposed to Pesticides." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/SpauldingBW2005.pdf.

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17

Fernandes, Herman A. "Vitellogenesis in the teleost Brachydanio rerio (Zebra fish) /." Title page, abstract and table of contents only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phF363.pdf.

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18

Stackpole, Catherine Amelia. "The effects of isolation and restraint stress, and cortisol, on the responsiveness of the anterior pituitary to gonadotrophin-releasing hormone in rams and ewes." Monash University, Dept. of Physiology, 2004. http://arrow.monash.edu.au/hdl/1959.1/9585.

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19

Abdo, Michael A. "Tumour necrosis factor : alpha signal transduction in rat corpus luteum apoptosis." University of Western Australia. School of Anatomy and Human Biology, 2002. http://theses.library.uwa.edu.au/adt-WU2003.0024.

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[Formulae and special characters can only be approximated here. Please see the pdf version of the abstract for an accurate reproduction.] Apoptosis is a morphologically distinct form of cell death that is involved in the regulation of normal and aberrant cell systems. The complexities of the apoptotic cell death pathway arise from variation in both the cellular specialisation and initial stimulus. The corpus luteum (CL) is an endocrine gland that whilst critical to the maintenance of pregnancy in the rat, regresses at the completion of each oestrous cycle and pregnancy. This regression is fa

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20

Kahwa, David. "Gametogenesis, gonadal recrudescence, restraint and spawning patterns in Nile perch, Lates niloticus (Linnaeus, 1758)." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001834.

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The Nile perch, Lates niloticus (Linnaeus, 1758), is a predacious freshwater fish widely distributed throughout the Afro-tropic eco-zone. The species was introduced to Lake Victoria in the early 1950s and by 1980 it had dominated the fisheries of Lake Victoria. This was followed by a dramatic decrease in the Nile perch fisheries production due to uncontrolled exploitation. The purpose of this thesis is to provide fundamental knowledge that can be applied in aquaculture and fisheries management through the study of the reproductive biology of L. niloticus. The research was aimed at the studying

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21

Kromrey, Natalie A., and University of Lethbridge Faculty of Arts and Science. "The effects of wastewater treatment plant effluent and agricultural runoff on the reproductive systems of fathead minnow, Pimephales promelas." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Biological Sciences, c2009, 2009. http://hdl.handle.net/10133/2519.

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Endocrine disrupting compounds and pesticides have been detected in rivers and irrigation canals of Southern Alberta, a semiarid region with irrigation-dependent crop production, intensive livestock operations, and a growing human population. However, little is known about the effects of agricultural runoff or wastewater treatment plant (WWTP) effluent in Southern Alberta on fish. Reproductive effects of WWTP effluents from the cities of Lethbridge and Medicine Hat, as well as agricultural runoff in the Lethbridge Northern Irrigation District canals, were investigated in a field study with wil

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22

Corbel, Tanguy. "Mécanismes toxicocinétiques impliqués dans l'exposition foetale au Bisphénol A." Thesis, Toulouse, INSA, 2013. http://www.theses.fr/2013ISAT0034/document.

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Le Bisphénol A (BPA) est un perturbateur endocrinien dont les effets développementaux observés chez les rongeurs soulèvent la question du risque pour la santé humaine relatif à une exposition fœtale au BPA. L’objectif de cette thèse est de déterminer les mécanismes toxicocinétiques impliqués dans l’exposition fœtale au BPA. La caractérisation in vivo dans un modèle intégratif ovin des expositions maternelles et fœtales au BPA et à ses métabolites ont permis d’identifier le transfert placentaire et le métabolisme fœto-placentaire comme les déterminants majeurs de l’exposition fœtale au BPA. Le

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23

Dunlap, Kathrin Anson. "Nongenomic inhibition of oxytocin binding by progesterone in ovine uteri." Thesis, 2002. http://hdl.handle.net/1957/31586.

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24

Earl, Colin R. "The regulation of the timing of melatonin secretion in the sheep." Thesis, 1989. http://hdl.handle.net/2440/19577.

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Includes bibliographical references (leaves 166-195)<br>xxi, 195 leaves : ill. ; 30 cm.<br>Addresses the nature of the central mechanisms involved in the regulation of the circadian pattern of secretion of the pineal hormone melatonin in the highly seasonal Suffolk breed of sheep. Provides new information on the behaviour of the onset and offset of melatonin secretion under different photoperiodic conditions.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Animal Sciences, 1989

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25

Papachristoforou, Christakis. "Androgenic and oestrogenic effects on the endrocrinology of reproductive development in male and female sheep (Ovis aries L.) / by Christakis Papachristoforou." 1988. http://hdl.handle.net/2440/18634.

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Typescript.<br>"April 1987."<br>Includes bibliograpical references (leaves 160-194).<br>xii, 194 leaves : ill. ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Presents direct comparative information on growth and endocrinological aspects of reproductive development in intact and gonadectomized male and female Merino lambs born in autumn and treated prepubertally with either a non-aromatizable androgen (trenbolone acetate) with higher androgenic potency than testosterone, oestradiol -17beta(oestradiol), or a comb

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26

Papachristoforou, Christakis. "Androgenic and oestrogenic effects on the endrocrinology of reproductive development in male and female sheep (Ovis aries L.) / by Christakis Papachristoforou." Thesis, 1988. http://hdl.handle.net/2440/18634.

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Typescript.<br>"April 1987."<br>Includes bibliograpical references (leaves 160-194).<br>xii, 194 leaves : ill. ; 30 cm.<br>Presents direct comparative information on growth and endocrinological aspects of reproductive development in intact and gonadectomized male and female Merino lambs born in autumn and treated prepubertally with either a non-aromatizable androgen (trenbolone acetate) with higher androgenic potency than testosterone, oestradiol -17beta(oestradiol), or a combination of these two steroid hormones.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Animal Sciences, 1988

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27

Slayden, Ov Daniel. "Endocrine regulation of uterine physiology in mink." Thesis, 1990. http://hdl.handle.net/1957/37449.

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28

Fitzpatrick, Martin S. "Endocrine regulation of final oocyte maturation and sex differentiation in salmonids." Thesis, 1990. http://hdl.handle.net/1957/37097.

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Sexual maturation and sex differentiation comprise facets of a common theme: reproduction. The endocrine system regulates many of the critical physiological processes necessary for reproduction and offers a framework within which technologies can be developed for controlling sexual maturation and sex differentiation. The studies described in this thesis were undertaken to improve the understanding of the endocrine control of these critical stages of development in salmonids. Final ovarian maturation in salmon is accompanied by dynamic changes in plasma hormone levels. Ovulation can be accelera

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29

Fouché, Chris Henri. "Endokrinologie en histomorfologie van die gonades van Cyprinus carpio L." Thesis, 2014. http://hdl.handle.net/10210/10618.

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M.Sc. (Zoology)<br>The histomorphology of the ovaries of Cyprinus carpio L., as well as the histomorphological changes that occur in these ovaries during the breeding cycle, were investigated. Concurrently, the blood plasma and ovarian cytosol were analized for the presence of gonadotropin (GtH), FSH, LH, Oestriol, Cortisol and Progesterone, with the aid of Test Kits which are commonly used for determining the levels of these hormones in human blood plasma. C. carpio possesses cystovaria which are continuous with the oviducts which unite before opening to the exterior via a gonopore. The resul

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30

Von, Deneen Karen M. "Plasma and fecal progestins during placentation in the mare." Thesis, 2002. http://hdl.handle.net/1957/32378.

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31

Putluru, Ravi K. "Differential expression of superoxide dismutases (SODS) in bovine corpus luteum during estrous cycle and pregnancy." Thesis, 2006. http://hdl.handle.net/10125/20395.

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32

Reed, Pamela J. "Studies on luteinizing hormone and gonadal steroids in male and female llamas (Lama glama)." Thesis, 1996. http://hdl.handle.net/1957/34576.

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33

Cortell, Anna Katherine. "Cyclopropenoid fatty acid-induced suppression of ovine corpus luteum function." Thesis, 1990. http://hdl.handle.net/1957/38222.

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34

Lynch, Kathleen Sheila. "Hormonal mechanisms for variation in female mate choice." Thesis, 2005. http://hdl.handle.net/2152/1619.

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35

Abu, Hasan Abu Dalya. "Human sperm diagnostic tests : a sequential approach during assisted reproduction management." 2011. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000160.

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D. Tech. Biomedical Sciences.<br>Discusses despite significant advances in andrological techniques, the execution of semen analysis is currently not performed in a sequential manner. As such, it is important that reproductive biology laboratories establish an optimal diagnostic scheme that will assist reproductive health workers to direct patients to a specific therapeutic intervention and procedure.

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36

Luna, Gonzalo. "Endocrine changes associated with the effect of nutrition on the timing of reconception and puberty in dairy cattle." Diss., 2000. http://hdl.handle.net/2263/22854.

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37

Sucheta, Susan Leers. "Secretion of luteinizing hormone in response to exogenous melatonin in postpartum beef cows and ovariectomized beef heifers." Thesis, 1993. http://hdl.handle.net/1957/35696.

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38

Widmann, Andrea A. "Development of an enzyme immunoassay using whole plasma to determine progesterone concentrations during early pregnancy in the mare." Thesis, 1991. http://hdl.handle.net/1957/37384.

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39

Ramsey, Mary Elizabeth 1965. "Molecular mechanisms underlying steroid hormone action during sex determination in the red-eared slider turtle, Trachemys scripta elegans." Thesis, 2007. http://hdl.handle.net/2152/3148.

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Many reptiles, including the red-eared slider turtle (Trachemys scripta elegans), exhibit temperature-dependent sex determination (TSD). Temperature determines sex during a temperature sensitive period (TSP), when gonadal sex is labile to both temperature and hormones -- particularly estrogen. Estrogen production is a key step in ovarian differentiation for many vertebrates, including TSD reptiles, and temperaturebased differences in aromatase expression during the TSP may be a critical step in ovarian determination. Steroidogenic factor-1 (Sf1) is a key gene in vertebrate sex determination an

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40

Wilson, Colleen Gay. "Metabolism of progestins in the pregnant equine." Thesis, 1992. http://hdl.handle.net/1957/37058.

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41

Riad, Mohamed Tarek. "Urinary estrogens and progestins in pregnant pony mares." Thesis, 1993. http://hdl.handle.net/1957/36880.

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Urinary steroids have been studied during early and late pregnancy in domestic horses or sporadic samples at various stages of pregnancy in wild equidae. In our studies, urinary estrone sulfate (E1S) and pregnanediol glucuronide (PdG) were monitored throughout pregnancy in six pony mares by enzyme immunoassay (EIA). Both hormones were corrected by creatinine (Cr) index to compensate for the variation in specific gravity. The mean concentration for ElS, (μg/mg Cr), was .38 ± .03 at d 0, decreased to .17 ± .04 at d 1, and maintained at less than .5 μg/mg Cr until d 30. Although, there was an app

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42

Orchinik, Miles. "Biochemical and behavioral characterization of steroid receptors in neuronal membranes." Thesis, 1992. http://hdl.handle.net/1957/36531.

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43

Fernandes, Herman A. "Vitellogenesis in the teleost Brachydanio rerio (Zebra fish) / Herman A. Fernandes." Thesis, 1994. http://hdl.handle.net/2440/22503.

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Bibliography: leaves 129-158.<br>xvii, 159, [11] leaves, [24] leaves of plates : ill. (some col.) ; 35 cm.<br>The major estrogen inducible protein in zebra fish liver has been purified to homogeneity by FPLC using anion exchange chromatography (Mono-Q Pharmacia) with purification being monitored by SDS-PAGE electrophoresis.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Obstetrics and Gynaecology, 1995?

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44

Maffucci, Jacqueline Ann. "The role of the N-methyl-D-aspartate receptor (NMDAR)--NR2b subunit in female reproductive aging." 2008. http://hdl.handle.net/2152/18180.

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Reproductive senescence in females is a natural part of the aging process. However, the process by which it occurs, and the relative role of each level of the hypothalamic-pituitary-gonadal axis, remains largely unknown. The neural circuitry regulating the hypothalamic axis, including glutamate acting through N-Methyl-D-Aspartate receptors (NMDARs) on GnRH neurons, appears to be key to this process. The NMDAR is tetrameric and composed of an obligatory NR1 subunit together with NR2 subunits. The subunit composition determines the channel kinetics of the receptor and changes through the life sp

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45

Al-Matubsi, Hisham Y. "Regulation of ovarian oxytocin and prostaglandin F2[alpha] release in the ovine oestrous cycle." Thesis, 1998. https://vuir.vu.edu.au/15557/.

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This thesis addresses the regulation of ovarian oxytocin and prostaglandin F2a (PGF2a) release in the ovine oestrous cycle, their role in luteolysis and a possible mechanism by which the oxytocin secretory pathway is controlled in ovarian tissue.

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46

Deshpande, Shayu. "Insights Into The Hormonal Regualtion Of Epididymal Function : A Role For Estrogen." Thesis, 2005. http://etd.iisc.ernet.in/handle/2005/1374.

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47

Maswanganye, Kgaogelo Amanda. "The effect of temperature and photoperiod on selected male reproductive characteristics in two seanonally breeding ( Cryptomys hottentotus hottentotus and Cryptomys hottentotus pretoriae ) and one aseasonally breeding mole-rat species ( Cryptomys damarensis )." Diss., 2003. http://hdl.handle.net/2263/27822.

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