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 19 of 19 for “"motile sperm"”.
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Effect of seminal plasma on cryopreservation and function of bovine spermatozoa
… determine the effect of seminal plasma (SP) on sperm viability parameters (estimated percent motile sperm, computer-aided percent motile sperm and percent intact acrosomes) and motion characteristics (average path velocity, VAP; curvilinear velocity, VCL; and straight line velocity, VSL) of …
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Factors affecting fertility in frozen-thawed boar sperm
Frozen-thawed boar sperm holds the potential to have an impact on the future of the swine industry. Utilization of this technology could improve a swine producer’s ability to access top-tier genetics from around the world, to improve efficiency, profitability, and the quality of product to meet …
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Predictive role of fresh and post-selection total motile sperm count in the success of autologous and oocyte-donor ICSI cycles [Ruolo predittivo del numero totale di spermatozoi mobili su campione fresco e post-selezione nel successo dei cicli ICSI autologhi e con ovodonazione]
… più sensibili. In questo contesto, il Total Motile Sperm Count (TMSC), che integra volume seminale, concentrazione e motilità, è stato proposto come predittore più affidabile della potenzialità riproduttiva maschile rispetto ai singoli parametri convenzionali. Questo studio multicentrico, …
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Factors causing anterior acrosomal swelling on motile bovine sperm
… of the apical ridge and anterior acrosome of motile bovine sperm was observed using differential interference contrast optics. Transmission electron microscopy indicated that the acrosomal matrix was extended into complex folds and/or projections. Outer acrosomal and plasma membrane integrity …
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THE ROLE OF AURORA KINASE IN THE DEVELOPING MALE GAMETOPHYTE OF MARSILEA VESTITA
… events, which result in the formation of 32 motile sperm. The blepharoplast is a subcellular structure that arises de novo at ~3.5 hours following microspore hydration and functions as a microtubule organizing center during the final mitotic division. I investigated the roles of aurora …
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The Kallikrein-Related Peptidases hK2 and PSA with Emphasis on Genetic Variation, Secretion, and Sperm Motility
… the semenogelins in semen, which releases motile sperm, and low levels of PSA have been associated with low sperm motility. The present objective was to evaluate factors that might influence release of hK2 and PSA, and to study those two proteins with regard to their levels in seminal …
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Investigating a novel in vitro embryo culture system – The Walking Egg Affordable Assisted Reproductive Technology
… by the addition of decreasing numbers of spermatozoa to non-fertilized bisected oocytes. The experiment was repeated with a selected sperm insemination number in 1 ml or 50 μl culture media to compare the tested culture system with conventional culture. Spermatozoa bound to the hemi-zonae …
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Strategies to improve artificial insemination by donor
Artificial insemination with donor sperm is a widely accepted form of treatment for severe male factor infertility. The introduction of quarantined, cryopreserved semen and the associated reduction in cycle fecundity when compared to fresh semen necessitated the development of strategies to improve …
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Relationships between in vivo and in vitro heterospermic ranking, embryo development, and sperm characteristics of Holstein and Jersey bulls
Heterospermic competition among bulls has been used in the past to establish relative fertility rankings in vivo and may be a more accurate fertility assessment and require fewer inseminations than binomial measures of fertility. The objectives of these experiments were to determine the …
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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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Determination of the effects of caffeine C1, 3. 7- trimethylxanthine in Tris-based egg yolk extender and different incubation intervals on the quality of cryopreserved bull semen
… structural and functional damage to bovine spermatozoa, resulting in reduced post-thaw fertility potential. Caffeine's ability to modify intracellular signaling pathways and mitigate the adverse effects of cryopreservation stress on spermatozoa makes it a promising supplement for improving …
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The Effects of Prostaglandin F2a, Oxytocin and Gonadotropin Releasing Hormone on Ejaculate Characteristics in the Dog
… rams, boars, stallions or rodents to increase sperm numbers in the ejaculate. Improving sperm quantity in the canine ejaculate would benefit all assisted reproductive techniques used in this species. The purpose of the present study was to evaluate the effects of PGF2a, oxytocin and GnRH on …
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THE SPECIAL WALLS AROUND GAMETES IN CERATOPTERIS RICHARDII AND AULACOMNIUM PALUSTRE: USING IMMUNOCYTOCHEMISTRY TO EXPOSE STRUCTURE, FUNCTION, AND DEVELOPMENT
… in land plants is the production of small motile sperm cells and larger non-motile eggs. Unique walls or cell matrices are formed during the development of these highly specialized cells, and are integral to their proper development and maturation. Yet, the polysaccharide composition, …
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Development and Characterization of Monoclonal Antisperm Antibodies: Potential for Contraception
… in developing countries. Immunization against spermatozoa might be such a method as judged by the accumulated evidence from studies on human females and in a number of female animal species.</p> <p>Two extraction techniques were used for sperm membrane antigen isolation. The first technique …
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Reproductive Success is Secured by a Rapidly-Evolving Short Peptide in Female Aedes Aegypti Mosquitoes
… reproduce and produce offspring. Healthy, motile sperm from a conspecific male and a complete blood meal from a human host are required for females to develop viable eggs, and thus ensure species survival. What are the internal mechanisms that coordinate the acquisition of these key …
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Effect of high and low dosage of fresh and frozen semen on accessory sperm number, fertility and embryo quality in artificially inseminated cattle
… frozen semen at a high inseminate dosage (lOOxl06sperm) contrasted to their effects at a conventional dosage (20xl06 sperm) on accessory sperm per ovum and 2) Evaluate the relationship between accessory sperm number per embry%vum and fertilization status/embryo quality if accessory sperm number …
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The combinative effect of soluble suLeA glycan and specialized bovine semen extender, FSRD4+, on bull sperm quality
… the U.S. as the preferred method to store bovine sperm due to convenience despite damage to sperm during processing and thawing. For this reason, one of our objectives was to determine if a liquid extender, FSRD4+, could extend the lifespan of sperm by days. Since longevity with minimal sperm …
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Controlled cultivation techniques for the recovery of threatened fishes in Virginia
… in most captive female margined madtoms. Sperm production in mature male madtoms was enigmatic; motile sperm were observed only once. Plasma testosterone concentrations in males peaked just prior to the spawning season at 6.5 ng/mL, but levels were not correlated with male gonadosomatic …
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New methods for cryopreserving rooster spermatozoa
Rooster spermatozoa sustain permanent membrane damage during cooling, thawing and dilution due to inappropriate changes during the phase transition and osmotic intolerance. Glycerol is a common cryoprotectant used to protect cells during freezing, but its relatively large molecular weight and …