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Assays based on sperm zona pellucida binding have been developed as diagnostic tests to predict the fertilisation potential of human spermatozoa. The aim of this study was to establish a similar assay for bull sperm. The results showed differences between established fertile bulls in the relative numbers of sperm cells bound to the zona pellucida of a batch of oocytes. These differences suggest that there may be a relationship between the sperm zona pellucida binding capacity and the fertility of bulls.

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