Motility and morphology of human spermatozoa in split ejaculates

Area of Science:

• Reproductive Biology
• Andrology
• Spermatozoa Analysis

Background:

• Semen analysis is crucial for male fertility evaluation.
• Understanding ejaculate fraction variability is important for accurate assessment.
• Sperm parameters can be influenced by collection methods and sample handling.

Purpose of the Study:

• To investigate sperm characteristics across different fractions of split human ejaculates.
• To determine if sperm motility and concentration vary between ejaculate fractions.
• To explore potential reasons for observed differences in sperm parameters.

Main Methods:

• Sperm concentration and motility parameters were analyzed in three fractions of split ejaculates from healthy volunteers.
• A semi-automatic analysis technique using multiple exposure photographs (MEP) was employed.
• Sperm morphology was assessed to correlate with motility differences.

Main Results:

• Sperm concentration and percentage motility were significantly higher in the first fraction compared to the third.
• Average spermatozoal velocity, speed constancy, and straight-line approach did not differ significantly between fractions.
• A higher proportion of normal spermatozoa was observed in the first fraction versus the last fraction.

Conclusions:

• The first fraction of a split ejaculate contains higher sperm concentration and motility.
• Differences in sperm morphology between fractions may explain variations in motility after collection.
• These findings have implications for standardized semen analysis and fertility diagnostics.