In this work the influence of the breed and age of boars on selected defects of sperm is estimated. It is shown that the breed and the variant of the crossing from which the boar comes, as well as his age, have a significant impact on the percentage of occurrence of the basis morphological defects of sperm in semen. It has been proved that Polish Large White breed boars are characterised by the best sperm. The highest percentage of sperm with defects characterised Pietrain boars aged 24–36 months, followed by Polish Landrace boars aged 24–36 months, and those over 36 months.

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