Tesis sobre el tema "Sheep – Reproduction – Endocrine aspects"
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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.
Texto completoMelnyk, 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.
Texto completoZhang, 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.
Texto completoEarl, 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.
Texto completoArcher, 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.
Texto completoNassiri, Mohammad Taghi Beigi. "Aspects of prolificacy in Cambridge sheep". Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321435.
Texto completoPryor, Andrew William. "Reproduction and Endocrine Aspects of Early and Mid Lactation Holstein Cows". Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/32486.
Texto completoMaster of Science
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.
Texto completoIn 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 estrous cycle, and P4 was released in vitro by fat mobilization.
In the third and fourth experiments, blood was collected continuously for 16 h from four ovariectomized cows offered maintenance or restricted energy diets after priming with P4 or estradiol (E2) using a crossover experimental design. The results indicated that P4 released during body fat mobilization is minor and is not related to LH secretion. Dietary energy restriction influenced plasma LH concentration and pulse amplitude but the effect was modulated by P4 and E2 priming. Dietary energy restriction decreased glucose concentration but did not influence plasma non-esterified fatty acids (NEFA), cortisol, P4 and insulin levels. Cortisol was negatively related to LH pulse frequency. Glucose and insulin were positively and negatively correlated with LH pulse amplitude, respectively. Cortisol, NEFA and glucose jointly had a negative correlation with LH concentration.
In the fifth experiment, blood samples were collected daily for 60 d and every 10 min for 8 h on 18, 36 and 54 d postpartum from 24 cows (12 ovariectomized) fed low (1.4 Mcal/kg DM) (L) or high (1.7 Mcal/kg DM) (H) energy in a 2 x 2 factorial treatment design. LH pulse frequency was reduced at 18 d postpartum in ovariectomized cows, but not in intact cows, fed L. First postpartum ovulation occurred later in intact cows fed L compared to those fed H. Energy balance and plasma glucose concentration were lower, but plasma NEFA, $ beta$-hydroxybutyrate (BHB) and E2 concentrations higher, in cows fed L compared to those fed H. E2 concentration in intact cows fed L was elevated for a prolonged period prior to first ovulation. Diet had no influence on plasma P4 and insulin concentrations. Plasma E2 and BHB concentrations were positively correlated with LH pulse frequency in intact cows across diets and ovariectomized cows fed L, respectively. NEFA were negatively correlated with LH pulse amplitude in ovariectomized cows fed L. Glucose, NEFA and P4 were negatively, but BHB, E2 and insulin positively correlated, individually or in association, with LH concentration.
Overall, the results suggest that the effect of dietary energy status on LH patterns and timing of onset of postpartum ovulation is modulated by priming with or presence of ovarian steroids. The relationships of metabolites and hormones with LH patterns appear to change with dietary energy level, ovarian status and mutual associations among the metabolites and hormones. These parameters, especially glucose and BHB, may be potential mediators of the effect of dietary energy status on LH patterns. (Abstract shortened by UMI.)
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.
Texto completoCote, 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.
Texto completoAlgire, 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.
Texto completoMootoo, 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.
Texto completoGrant, 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.
Texto completoKwan, 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.
Texto completoIn vitro studies were conducted with a spontaneously established cell line developed through continuous culturing of primary granulosa cells collected from prepuberal gilts six hours after they had received PMSG. Characterization of these cells revealed that aromatase and steroidogenesis were functional but gonadotropin receptors were not present. When extracellular PGF2$ alpha$ levels were measured, dexamethasone was able to significantly suppress PGF$ sb{2 alpha}$ concentrations, but not as effectively as with indomethacin. (Abstract shortened by UMI.)
Krown, Kevin Alan. "Pituitary changes in force-molted hens". Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185205.
Texto completoSpaulding, 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.
Texto completoFernandes, 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.
Texto completoStackpole, 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.
Texto completoAbdo, 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.
Texto completoKahwa, 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.
Texto completoKromrey, Natalie A. y 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.
Texto completoxi, 104 leaves : ill. (some col.), maps ; 29 cm
Corbel, Tanguy. "Mécanismes toxicocinétiques impliqués dans l'exposition foetale au Bisphénol A". Thesis, Toulouse, INSA, 2013. http://www.theses.fr/2013ISAT0034/document.
Texto completoBisphenol A (BPA) an endocrine disruptor interfering with developmental processes in rodents, raises the question of risk for human health related to fetal exposure to BPA. The goal of this work was to determine the toxicokinetic mechanisms involved in fetal exposure to BPA. The disposition of BPA and its metabolites in the maternal-placental-fetal unit in an in vivo ovine model enabled us to identify the placental transfer and the fetal-placental metabolism as the major determining factors of fetal exposure to BPA. Bidirectional placental transfer of BPA occurs by passive diffusion leading to a ratio of free BPA between the fetal and maternal plasma concentrations of about 1. By contrast, the permeability of BPA-G is very limited, particularly in materno-to-fetal direction. The hepatic conjugation activities were very low in ovine fetus at an early stage of development and increased throughout pregnancy. Hydrolysis of BPA conjugates observed ex vivo into fetal ovine gonads could lead to local exposure to native BPA. Altogether, these results suggest that the early stage of pregnancy is a critical window of exposure for the developing fetus
Dunlap, Kathrin Anson. "Nongenomic inhibition of oxytocin binding by progesterone in ovine uteri". Thesis, 2002. http://hdl.handle.net/1957/31586.
Texto completoEarl, Colin R. "The regulation of the timing of melatonin secretion in the sheep". Thesis, 1989. http://hdl.handle.net/2440/19577.
Texto completoxxi, 195 leaves : ill. ; 30 cm.
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.
Thesis (Ph.D.)--University of Adelaide, Dept. of Animal Sciences, 1989
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.
Texto completo"April 1987."
Includes bibliograpical references (leaves 160-194).
xii, 194 leaves : ill. ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
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.
Thesis (Ph.D.)--University of Adelaide, Dept. of Animal Sciences, 1988
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.
Texto completo"April 1987."
Includes bibliograpical references (leaves 160-194).
xii, 194 leaves : ill. ; 30 cm.
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.
Thesis (Ph.D.)--University of Adelaide, Dept. of Animal Sciences, 1988
Slayden, Ov Daniel. "Endocrine regulation of uterine physiology in mink". Thesis, 1990. http://hdl.handle.net/1957/37449.
Texto completoFitzpatrick, Martin S. "Endocrine regulation of final oocyte maturation and sex differentiation in salmonids". Thesis, 1990. http://hdl.handle.net/1957/37097.
Texto completoGraduation date: 1991
Fouché, Chris Henri. "Endokrinologie en histomorfologie van die gonades van Cyprinus carpio L". Thesis, 2014. http://hdl.handle.net/10210/10618.
Texto completoThe 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 results clearly show that C. carpio has a four season breeding cycle and that egg laying occurs during Spring and Summer. Furthermore morphological changes of the ovary (which occurred during the breeding cycle) as well as the oocyte developmental stages, closely resemble those respectively described for teleosts in general by Kesteven (1960) and Malhotra et al., (1978). The endocrinological tests clearly indicated the presence of GtH, FSH, LH, Oestriol and Cortisol, while all the tests for Progesterone were negative. A comparison between the presence of the abovementioned hormones and the histomorphological development of the ovaries during the breeding cycle indicate that the endocrinological control mechanisms are similar to those which have been described for other teleosts. However, a clear distinction was found between FSH and LH which is a possible indication that C. carpio does not possess a single gonadotropin, but rather that FSH and LH have evolved in this species.
Von, Deneen Karen M. "Plasma and fecal progestins during placentation in the mare". Thesis, 2002. http://hdl.handle.net/1957/32378.
Texto completoPutluru, 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.
Texto completoReed, Pamela J. "Studies on luteinizing hormone and gonadal steroids in male and female llamas (Lama glama)". Thesis, 1996. http://hdl.handle.net/1957/34576.
Texto completoCortell, Anna Katherine. "Cyclopropenoid fatty acid-induced suppression of ovine corpus luteum function". Thesis, 1990. http://hdl.handle.net/1957/38222.
Texto completoLynch, Kathleen Sheila. "Hormonal mechanisms for variation in female mate choice". Thesis, 2005. http://hdl.handle.net/2152/1619.
Texto completoAbu, 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.
Texto completoDiscusses 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.
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.
Texto completoSucheta, 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.
Texto completoWidmann, 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.
Texto completoRamsey, 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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Wilson, Colleen Gay. "Metabolism of progestins in the pregnant equine". Thesis, 1992. http://hdl.handle.net/1957/37058.
Texto completoRiad, Mohamed Tarek. "Urinary estrogens and progestins in pregnant pony mares". Thesis, 1993. http://hdl.handle.net/1957/36880.
Texto completoGraduation date: 1993
Orchinik, Miles. "Biochemical and behavioral characterization of steroid receptors in neuronal membranes". Thesis, 1992. http://hdl.handle.net/1957/36531.
Texto completoFernandes, Herman A. "Vitellogenesis in the teleost Brachydanio rerio (Zebra fish) / Herman A. Fernandes". Thesis, 1994. http://hdl.handle.net/2440/22503.
Texto completoxvii, 159, [11] leaves, [24] leaves of plates : ill. (some col.) ; 35 cm.
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.
Thesis (Ph.D.)--University of Adelaide, Dept. of Obstetrics and Gynaecology, 1995?
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.
Texto completotext
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/.
Texto completoDeshpande, Shayu. "Insights Into The Hormonal Regualtion Of Epididymal Function : A Role For Estrogen". Thesis, 2005. http://etd.iisc.ernet.in/handle/2005/1374.
Texto completoMaswanganye, 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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