Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Sperm Storage"”.
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The Evolution of Fitness After Prolonged Sperm Storage
… exposure will ultimately be detrimental due to sperm-depletion and infertility. Females are therefore expected to balance mating opportunities and sperm storage capacity to maximize lifetime reproductive success. I introduced extended mating deprivation as a selective pressure to experimentally …
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Role of the oviduct environment in sperm storage
… SDS-PAGE and immunoblotting to detect SLC6A8 in sperm protein lysates and determined that it is present. To further characterize the distribution of SLC6A8 in sperm, we used immunofluorescence. Our findings demonstrated that the creatine transport channel co-localizes in the acrosomal region of …
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Ultrastructural analyses of uterovaginal sperm storage glands of turkey breeder hens
The ultrastructure of the uterovaginal sperm storage glands of turkey hens was characterized. The ultrastructural morphology of these cells was monitored over an entire egg laying season. In addition, comparisons were made between glands from fertile and infertile hens. Based on ultrastructural …
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Studies of insemination and sperm storage in intra- and inter-strain crosses of Drosophila melanogaster
Thesis (M.S.)--Michigan State University of Agriculture and Applied Science. Dept. of Zoology, 1962
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Reproductive Biology of the Bonnethead (Sphyrna tiburo) from the Southeastern U.S. Atlantic Coast
… periods in the reproductive cycle, such as sperm storage in females. Overall, Atlantic coast bonnetheads were found to exhibit reproductive patterns similar to those reported in the Gulf with slight temporal shifts in the time of mating and ovulation and slightly lower fecundity ranging …
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The relationship between humoral and local anti-sperm antibody production and infertility in turkey breeder hens
… had no effect upon hen fertility, or serum anti-sperm antibody titers. No differences in fertility were found between hens showing a positive or negative anti-sperm antibody response. Experiment II demonstrated that only relatively infertile turkey hens had antibody positive cells within the …
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Stealing, scavenging, or storing? Breeding behaviors of unisexual Ambystoma salamanders
… kleptogenesis. Kleptogenesis requires sperm from male salamanders of co-occurring sexual species, potentially putting unisexual and sexual females in breeding competition. We investigated if unisexual salamanders require courtship from sexual males or if they can use sperm left over …
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Sablefish (Anoplopoma fimbria) sperm: The physiology of activation and the development of a cryopreservation protocol
… about male reproductive development and sperm physiology in sablefish or how to optimize fertilization and sperm storage in this species for aquaculture. In the present study the conditions required for sablefish sperm activation were investigated and an optimized regime for …
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Molecular ecology of hawksbill turtles Eretmochelys imbricata in the Seychelles
… by a single male each, and that they used stored sperm to fertilise all of their multiple clutches across a nesting season. There was no evidence of females biasing paternity towards males with particular genetic properties (variability, dissimilarity), suggesting that females are not using sperm …
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IDENTIFYING THE INFLUENCE OF SELECTIVE EPISODES AND MECHANISMS ON REPRODUCTIVE SUCCESS IN TRIBOLIUM CASTANEUM AND DROSOPHILA MELANOGASTER
… reproductive success. After copulation occurs, sperm from multiple males compete within the female reproductive tract to fertilize eggs, while females morphologically or behaviorally bias fertilization to preferred males, further shaping reproductive success. Additionally, the act of mating …
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Function and evolution of seminal fluid components in Drosophila
… conflicts such as male-female sexual conflict, sperm competition, and cryptic female choice. These forces have driven rapid diversification of reproductive molecules across species, with lineage-specific gains, losses, and gene duplications shaping the complement of reproductive fluids. Despite …
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The biology, ecology and population trends of jacopever Helicolenus dactylopterus in South Africa
… delay between insemination and fertilisation. Sperm storage was found in histologically analysed ovaries. The diet investigation indicated a selective benthic predator with an ontogenetic shift in diet from crustaceans to teleosts. To assess habitat preference, generalised linear models were …
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Analyzing the Longevity of Sperm Within the Female Japanese Quail by Assessing Sperm Penetration of the Perivitelline Layer Under Optimal and Suboptimal Conditions.
… semen within the female reproductive tract. The sperm storage tubules will store and subsequently release semen to travel up the oviduct. Sperm cells that make the trek up the oviduct have a chance to fertilize the ovum. These sperm cells will bind to the perivitelline layer of the ovum and …
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Reproductive ecology of Vestimentifera (Polychaeta: Siboglinidae) from hydrothermal vents and cold seeps
… exchange have been widely discussed. Direct sperm transfer from males to females has been documented in two species, Ridgeia piscesae and Tevniajerichonana, but others were believed to spawn primary oocytes. Brooding of embryos have never been observed in any species. These observations have …
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Channeled Whelk (Busycotypus canaliculatus) Ecology in Relation to the Fishery in Vineyard and Nantucket Sounds, Massachusetts
… move or feed throughout the egg laying process. Sperm storage capabilities > 1 year were observed, indicating female channeled whelks can delay spawning periods, perhaps to coincide with favorable conditions. While egg strings and embryos varied in length and number, more research is needed to …
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Cryopreservation of Domestic Cat Epididymal Spermatozoa
… still effectively freeze domestic cat epididymal spermatozoa, for the purpose to sort spermatozoa into X and Y, using flow cytometry. In the first experiment we compared a TesT (Tes + Tris) 20% egg yolk extender (control) to a modified human sperm preservation medium (HSPM) and a Tris citrate …
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Spatial ecology, habitat use, genetic diversity, and reproductive success: measures of connectivity of a sympatric freshwater turtle assemblage in a fragmented landscape
… one confirmed instance of across-season sperm storage. I also only detected 8% multiple paternity in 28 clutches. High variation in reproductive success and low levels of multiple paternity may be attributed to small population size. During this study, I detected differences among species …
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La riproduzione dei condroitti come elemento chiave per la loro conservazione e gestione nel Mediterraneo centro-occidentale
… gland micro-architecture, with a 'long-term storage' of sperms (about two years) in special compartments called Sperm Storage Tubules (SST). This observation would lead to hypothesize a reproductive strategy that would benefit them in survival in deep environments, where the chances of mating …