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172 results for “ejaculate”
Sperm competition risk affects ejaculate strategy in terms of sperm number but not sperm size in squid
<p><span><span><span><span><span><span><span><span><span><span><span>In polygamous species, the mode of sperm storage in females influences evolution of sperm quantitative and qualitative traits because it provides the arena for sperm competition, cryptic female choice and fertilization processes. In this study, we compared ejaculate traits of two squid species, <i>Heterololigo bleekeri </i>and <i>Loligo reynaudii</i>. Both species show dimorphic sperm traits associated with alternative reproductive tactics where consort and sneaker males transfer sperm to different storage sites within a female (on the oviduct and near the mouth, respectively). Due to differences in reproductive behaviours and sperm placement, sperm competition risk is expected to be higher in sneakers than in consorts of both species, and higher overall in <i>L. reynaudii</i>. Our results demonstrate that the instantaneous number of released sperm is adjusted to the expected sperm competition risk via an elaborate sperm package. Consort sperm are similar in size, however, sneaker sperm have a significantly longer flagellum in <i>H. bleekeri </i>than in <i>L. reynaudii</i>, most likely due to intra-tactic conflicts associated with sperm storage conditions. From consideration of the different mating tactics, we suggest that while levels of sperm competition determine quantitative traits, sperm quality traits are determined more by the mode of sperm storage and fertilization.</span></span></span></span></span></span></span></span></span></span></span></p>
Comparative Evaluation of Safety and Efficacy of Dapoxetine, Silodosin, and Citalopram in the Management of Premature Ejaculation
ClinicalTrials.gov study NCT07113145. IPD Sharing: NO. Countries: 1. Publications: 1.
Split Cohort Trial Comparing IVF Outcomes After the Use of Testicular vs. Ejaculated Sperm for ICSI
ClinicalTrials.gov study NCT03483298. IPD Sharing: NO. Countries: 1. Publications: 6.
Study to Evaluate Efficacy and Safety in Males Subjects With Premature Ejaculation
ClinicalTrials.gov study NCT00983151. IPD Sharing: Not stated. Countries: 7. Publications: 1.
The Prevalence of Erectile Dysfunction (ED) and Premature Ejaculation (PE) in Poland
ClinicalTrials.gov study NCT05462171. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Effect of Exercise on Premature Ejaculation
ClinicalTrials.gov study NCT02984592. IPD Sharing: YES. Countries: 1. Publications: 2.
The Study on the Effectiveness and Safety of Electroacupuncture at ST36 in Treating Primary Premature Ejaculation
ClinicalTrials.gov study NCT06172855. IPD Sharing: Not stated. Countries: 1. Publications: 7.
Effect of Respiratory Exercises On The Intravaginal Ejaculation Latency Time
ClinicalTrials.gov study NCT05517694. IPD Sharing: Not stated. Countries: 1. Publications: 6.
Chronotype and Premature Ejaculation
ClinicalTrials.gov study NCT04841395. IPD Sharing: NO. Countries: 1. Publications: 3.
The Impact and Benefit of Physical Activity on Premature Ejaculation
ClinicalTrials.gov study NCT02844998. IPD Sharing: YES. Countries: 0. Publications: 3.
Retrograde Ejaculation and Sexual Dysfunction in Men With Diabetes Mellitus
ClinicalTrials.gov study NCT01743599. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Comparison of the Efficacy and Safety of Dapoxetine, Kegel Exercises, and Acupuncture in the Treatment of Premature Ejaculation: A Randomized, Double-Blind, Placebo-Controlled Trial
ClinicalTrials.gov study NCT07067970. IPD Sharing: UNDECIDED. Countries: 1. Publications: 4.
Efficacy and Safety of Paroxetine Daily Doses of 15 mg and 20 mg in the Treatment of Premature Ejaculation
ClinicalTrials.gov study NCT01024491. IPD Sharing: Not stated. Countries: 1. Publications: 8.
Ejaculation Abstinence Time and Assisted Reproductive Technology Outcomes
ClinicalTrials.gov study NCT06410417. IPD Sharing: Not stated. Countries: 1. Publications: 19.
Vagus Nerve Stimulation in Premature Ejaculation
ClinicalTrials.gov study NCT07300774. IPD Sharing: UNDECIDED. Countries: 1. Publications: 3.
Primary Premature Ejaculation Genetics
ClinicalTrials.gov study NCT02109302. IPD Sharing: NO. Countries: 1. Publications: 1.
Study to Evaluate Efficacy and Safety in Male Subjects With Premature Ejaculation
ClinicalTrials.gov study NCT00983736. IPD Sharing: Not stated. Countries: 5. Publications: 1.
Is Ejaculation Preservation TURis the Natural Evolution of the "Gold Standard".
ClinicalTrials.gov study NCT06263049. IPD Sharing: NO. Countries: 1. Publications: 1.
Research and Clinical Value of New Classification for Premature Ejaculation: Multi-Center Research
ClinicalTrials.gov study NCT02572037. IPD Sharing: Not stated. Countries: 1. Publications: 11.
Ejaculation Frequency and Semen Parameters
ClinicalTrials.gov study NCT06172504. IPD Sharing: NO. Countries: 1. Publications: 6.
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