The aim of this thesis was to evaluate the quantitative and qualitative parameters of boar semen for insemination center Radouňka. There were 74 breeding boars of Czech Large White, Czech Landrace and line L48 monitored at the station. Basic quantitative and qualitative parameters of semen were monitored (volume in ml, sperm concentration in 1mm3. motility in % and the percentage of pathological sperms) which were assessed according to breed, age of boar, influence of season and sperm production. The individual parameters of breeding boar?s semen were monitored from January 2009 to December 2011.