An attempt to evaluate the effect of spermatozoa concentration in one ejaculate on their measurements, shape, frequency of occurrence of morphological abnormalities in spermatozoa and physical traits of boar ejaculates in Pietrain breed was made.
It was concluded that there was a slight dependence between the content of spermatozoa in one ejaculate and morphometrical traits of spermatozoa. In semen with lower content of spermatozoa (I and II group), the spermatozoa had slightly longer heads (by about 0.18 μm) than in semen with large spermatozoa concentration (III group).
Spermatozoa in ejaculates with the lowest spermatozoa concentration were characterized by the longest flagellum
and the largest total length. The total length of spermatozoa was decreasing in groups of larger concentration, which was caused by both lower length of heads and flagella. Some differences in spermatozoa shape in relation to their concentration in one ejaculate were found. Spermatozoa in ejaculates, which were classified into II group, seemed to have less prolate shape than spermatozoa in ejaculates of I and III groups. It was stated that the content of spermatozoa in one ejaculate affected the frequency of spermatozoa with morphological changes. Semen assigned to II group was
distinguished by the best quality.
