Penetration of sperm from teratospermic men into zona‐free hamster eggs

Ruth Shalgi*, Jehoshua Dor, Edwina Rudak, Ayala Lusky, Boleslaw Goldman, Shlomo Mashiach, Laslo Nebel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The ability of sperm samples from male partners of infertile couples, with isolated teratospermia (ITS), to penetrate zona‐free hamster eggs was examined. The ITS patients had a significantly lower proportion of normal spermatozoa than did a control group of men of proven fertility (23.6% and 47.8%, respectively; P < 0.001), while the mean total sperm count and the % motility did not differ between the two groups. The mean hamster egg penetration rate of sperm from ITS patients was 2.64% compared to 31.1% in the control group. A significant negative correlation was found in the ITS group between the proportion of a) abnormal forms and the ability to penetrate zona‐free hamster eggs, and b) pyriform‐shaped sperm and the penetration rate. Of the sperm parameters which were examined, only the morphology could be correlated with the rate of penetration.

Original languageEnglish
Pages (from-to)285-294
Number of pages10
JournalInternational Journal of Andrology
Issue number4
StatePublished - Aug 1985


  • penetration
  • teratospermia
  • zona free hamster egg penetration‐test


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