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The study aimed to investigate changes in semen parameters of insemination boars of selected breeds with reference to seasonal changes in the properties of ejaculates in the European boar (Sus scrofa L.). The material for the study covered 88000 ejaculates obtained from boars of the following breeds: Polish Large White, Polish Landrace, Duroc, Hampshire, Pietrain, Duroc×Pietrain, Pietrain×Duroc. The results of the research indicate that seasonal changes in the quality of the produced ejaculates, similar to those occurring in the males of the wild boar, still occur in insemination boars. The observed changes concern above all the volume of the ejaculates, the total number and concentration of spermatozoa. Seasonal variation in the quality of the produced ejaculates is fixed and has not decreased in the recent years despite the conducted breeding activities, selection and the limitation of the influence of environmental factors.

RESULTS OF BREEDING USE OF INSEMINATION BOARS OF SELECTED BREEDS IN THE SEASONS OF THE REPRODUCTIVE CYCLE OF THE EUROPEAN WILD BOAR (SUS SCROFA L.)