EN
295 ejaculates of 150 stallions of various breeds (full English, Great Polish, Hannower and Polish ponny) used for mating in 17 horse breeding centres in Poland were examined bacteriologically. More than 23% of ejaculates were contaminated with facultative pathogenic bacteria, mostly by Pseudomonas aeruginosa (10% of samples) sensitive to streptomycin (100%) and neomycin (8%). Sir. zooepidemicus was also isolated (9.5%), sensitive mostly to chloramphenicol (73%), penicillin (64%) and oxytetra- cycline (50% of strains).