Results 41 to 50 of about 216,508 (311)
Environment International, 2020 Semen quality is a vital determinant for male fertility. The process of spermatogenesis is highly sensitive to fluctuations in temperature. However, the impact of ambient temperature on semen quality remains unclear. We aimed to quantitatively assess the
Yun Zhou +12 more
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Factors affecting sperm quality before and after mating of calopterygid damselflies. [PDF]
PLoS ONE, 2010 Damselflies (Odonata: Zygoptera) have a more complex sperm transfer system than other internally ejaculating insects. Males translocate sperm from the internal reproductive organs to the specific sperm vesicles, a small cavity on the body surface, and ...
Kaori Tsuchiya, Fumio Hayashi
doaj +1 more source
Decline of semen quality among Chinese sperm bank donors within 7 years (2008-2014)
Asian Journal of Andrology, 2017 Semen from 5210 sperm bank donors was analyzed and trends in semen quality were evaluated at Shandong Human Sperm Bank between 2008 and 2014. After 2-7 days of abstinence, semen samples were collected.
Li Wang +5 more
doaj +1 more source
Low-Cost QCM Sensor System for Screening Semen Samples [PDF]
, 2010 Artificial insemination is a well-established part of modern agricultural practice. A viable semen sample is judged by the total number of spermatozoa (sperm) in the sample and the motility of the sperm.
Atherton, Shaun +6 more
core +2 more sources
Sperm mobility phenotype not determined by sperm quality index
Poultry Science, 2003 We tested the capacity of the AviMate sperm quality analyzer to predict sperm mobility phenotype. A preliminary experiment was performed to determine a sperm concentration that afforded maximal sperm quality index (SQI) values with sperm from males with high sperm mobility.
D P, Froman, E R, Bowling, J L, Wilsont
openaire +2 more sources
Cryopreservation and quality assessment of boar semen collected from bulk samples
Veterinární Medicína, 2019 The purpose of this study was to examine sperm quality after cryopreservation of ejaculates collected as a bulk sample, which is routinely part of semen collection, and to compare this quality with the sperm-rich fraction in boars.
Ruthaiporn Ratchamak +3 more
doaj +1 more source
Effects of temperature anomaly on sperm quality: A multi-center study of 33,234 men
HeliyonBackgrounds: Global fertility rates continue to decline and sperm quality is a prime factor affecting male fertility. Both extreme cold and heat have been demonstrated to be associated with decreased sperm quality, but no epidemiological studies have ...
Lina Xiao +15 more
doaj +1 more source
Sperm design and variation in the New World blackbirds (Icteridae) [PDF]
, 2009 Post-copulatory sexual selection (PCSS) is thought to be one of the evolutionary forces responsible for the rapid and divergent evolution of sperm design. However, whereas in some taxa particular sperm traits are positively associated with PCSS, in other
AF Malo +81 more
core +2 more sources
Effects of L-carnitine and L-acetyl-carnitine on testicular sperm motility and chromatin quality [PDF]
Iranian Journal of Reproductive Medicine, 2012 Background: Sperm cells extracted from testes (TESE) have poor chromatin quality and motility. Various substances are used in the laboratory to increase sperm motility and improve the ART outcomes; however, there are few research which considered ...
Elham Aliabadi +5 more
doaj
Frontiers in Ecology and Evolution, 2017 Sperm viability (SV), the proportion of live sperm in a sample, is a widely applied measure of sperm quality but few studies test its robustness. At least three reasons make SV problematic as a surrogate for sperm quality. First, reviewing the ecological
Barbara A. Eckel +2 more
doaj +1 more source