The aim of the observations was to assess the influence of specific bacteriophages on the properties of sperm of boars infected by the blue pus bacterium. The study covered 15 boar reproducers: 5 of them had experimentally been infected with Pseudomonas aeruginosa, whereas the remaining 10 were males exploited at the Pigs Insemination Station in whose preputial sac or sperm the microorganism concerned had been discovered. The therapy was pursued for three weeks. Before and after the treatment, sexual responses, sperm (quantity, concentration of spermatozoa, percentage of sperm cells having correct movement, their morphology and survival rate), peripheral blood and the capacity of blood cells to produce cytokines were examined. No essential differences between the studied sexual responses before and after the therapy were found. In the sperm properties, the only statistically significant differences were recorded for sperm cells survivability in the BTS dilutor, which increased after the treatment by 230–242%. After the therapy with bacteriophages a decline was found in the level of IL-10 in blood serum and supernatants of cell cultures stimulated with LPS and ones unstimulated. The results obtained (improvement of the survivability of spermatozoa) wholly justify the need to employ the bacteriophage therapy in the treatment of reproductive boars infected by the blue pus bacterium.

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