The aim of this research was to investigate the influence of the
bull i.e. genotype on the observed traits of semen quality and to determine whether
there are significant differences between bulls in terms of semen production. The
study included 9 bulls of the Holstein-Friesian breed from the Livestock Center of
PKB Corporation. The effect of the bull on certain semen properties (ejaculate
volume, sperm concentration, sperm motility in the native ejaculate, sperm
dilution, number of doses per ejaculate, sperm motility after thawing) was analyzed
and data were collected during 2014. During this period, a total of 326 ejaculates
from 9 bulls were collected and average values for the tested properties were
determined and the effect of the bull on those properties was analyzed. The results
showed that there was a very significant effect of the bull (p<0.001) on the degree
of sperm dilution and the number of doses per ejaculate. Significant influence
(p<0.01) was found in ejaculate volume traits, sperm concentration, sperm motility
in the native ejaculate, while in sperm motility after thawing no significant effect
(p> 0.05) of the bull was determined. The LSD test (Least Significant Difference)
was used to compare the bulls and the results of this test showed in most cases
significant differences between the bulls
