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Are changing semen parameters a universal phenomenon?

D N Osegbe, E O Amaku, S N Nnatu

    European Urology
    |January 1, 1986
    PubMed
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    Semen analysis in fertile Black men shows sperm density comparable to recent Caucasian studies, suggesting a potential decline in male fertility over the past 30 years.

    Area of Science:

    • Reproductive biology
    • Andrology
    • Human fertility studies

    Background:

    • Semen quality is a key indicator of male reproductive health.
    • Previous studies suggested varying semen parameters across different populations and time periods.

    Purpose of the Study:

    • To assess the semen characteristics of fertile indigenous Black men.
    • To compare current findings with historical and recent data in other populations.

    Main Methods:

    • Analysis of semen parameters from 100 fertile indigenous Black males.
    • Statistical comparison with existing literature.

    Main Results:

    • Mean semen volume: 2.6 ml
    • Mean sperm density: 55 million/ml

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  • Mean sperm motility: 61%
  • Mean well-formed sperm: 71%

    • Conclusions:

    • Current semen parameters in fertile Black men align with recent Caucasian studies.
    • Findings support a potential decline in sperm density in fertile males over the last three decades.
    • Established historical standards for sperm concentration may require re-evaluation.