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Zinc effects on mouse spermatozoa and in-vitro fertilization

Summary. The fertilizing ability of mouse epididymal and capacitated spermatozoa was tested by mixing with normal or zona-free ova. In the presence of Zn²⁺, the epididymal spermatozoa failed not only to penetrate the zona pellucida but also to fuse with zone-free ova, while no effect was observed on capacitated spermatozoa.

Zn²⁺ also inhibited fertilization with spermatozoa preincubated in Ca²⁺-free medium. However, shortly after the addition of Ca²⁺ to the preincubated spermatozoa, Zn²⁺ lost its fertilization inhibitory activity.

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