Results 211 to 220 of about 40,908 (256)
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Reexamination of “normal” sperm count
Urology, 1974A males ejaculated semen can vary up to 40% in volume sperm count and sperm motivility 100 vasectomized men were studied before vasectomy for sperm counts of single specimens; 15% of these men (all fathers of 2 or more children) had sperm counts considered by accepted standards to be infertile (below 60 million).
F C, Derrick, J, Johnson
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2017
Selection of the best ejaculate from the donor species depends greatly on precise calculation of the concentration of the live sperm cells. Different laboratories engaged in the semen biology work employ variety of instruments and procedures. These, coupled with the variability of the result induced by the objective assessment (inter-technician ...
P. Perumal +3 more
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Selection of the best ejaculate from the donor species depends greatly on precise calculation of the concentration of the live sperm cells. Different laboratories engaged in the semen biology work employ variety of instruments and procedures. These, coupled with the variability of the result induced by the objective assessment (inter-technician ...
P. Perumal +3 more
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Worldwide variations in sperm counts
Urology, 1996Based on the premise that various human disease processes manifest differently depending on geography, we set out to determine whether sperm counts vary from different nations and different regions within the United States.We reviewed the literature of all significant population-based studies that evaluated sperm counts from fertile or presumably ...
H, Fisch, E F, Ikeguchi, E T, Goluboff
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Evaluation of Sperm Counts and Total Sperm Counts in 2543 Men Requesting Vasectomy
Andrologia, 2009Semen analyses were performed on semen specimens from 2543 men requesting vasectomy at Planned Parenthood of Houston and the results were compared to earlier reports of semen analyses in allegedly fertile men. The comparisons suggest that mean sperm counts and mean total sperm counts are significantly lower than those reported in 1951.
K D, Smith +3 more
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Estrogens and falling sperm counts
Reproduction, Fertility and Development, 2001Extravagant claims have been made repeatedly in recent years that human sperm counts are falling and that global exposure to environmental estrogens are responsible. The basis for these two distinct claims is reviewed. The claims of falling human sperm output, reviving an old debate, are prompted by a paper by Carlsen et al . (1992). This meta-analysis,
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Sperm count and sperm motility decrease in old rats
Physiology & Behavior, 2013Sexual behavior declines with age in male rats. The rate and magnitude of this decline may depend on the amount of prior sexual experience and a number of other, unidentified factors. Age-dependent changes in the characteristics of ejaculate quality in rats have not been described earlier, and the relationship between such changes and modifications of ...
Rosa Angélica, Lucio +3 more
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Experience with Sperm Counts Following Vasectomy
British Journal of Urology, 1991Summary The records of Aberdeen men requesting vasectomy between 1978 and 1981 were studied and a sample of men were interviewed about 3 years after the operation; 85% completed the standard requirements for seminal analysis and were given the “all clear”; two‐thirds were cleared after sending 2 samples and ...
B, Thompson +3 more
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Low Sperm Counts May Be Preventable
Science, 2011In the News & Analysis article “Danish sperm counts spark data dispute” (G. Vogel, 17 June, p. [1369][1]), the Danish National Board of Health implies that it is normal for many young Danes to have a sperm count low enough to impair fertility. I disagree. Two recent U.S.
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Secular Trend in Reported Sperm Counts
Andrologia, 2009Claims that there has been a recent secular decline in splerm counts have been disputed. Protaglonists on both sides of the discussion have based their arguments on data from a few large samples at different times and (mostly) in different places. It is not disputed that the differences between the mean counts in the various samples are statistically ...
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