The experimental material consisted of 75 ejaculates collected form 8 Duroc boars. The ejaculates
were divided into three groups according to sperm concentration in an ejaculate. An ejaculate
was obtained from each boar monthly and it was used to make microscopic preparations to examine
spermatozoa morphology. In each preparation morphometric measurements were taken of fifteen
randomly selected spermatozoa characterized by normal morphology. The following measurements of
spermatozoa were taken: length and width of the spermatozoa head, head area, length of the flagellum,
perimeter of the spermatozoon head and total spermatozoon length. The results were used to
calculate indicators of spermatozoa morphology. Moreover, assessments were made of frequency of
morphological defects to isolate spermatozoa with primary and secondary abnormalities following the
Blom classification system. It was found that the concentration of spermatozoa in the ejaculate
influenced the morphometric characteristics of spermatozoa. Ejaculates with low sperm concentrations
are characterized by larger spermatozoa as compared to ejaculates with high sperm concentrations.
However, sperm concentration in the ejaculate does not much influence the shape of spermatozoa.
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