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The most important infectious diseases that aff ect fertility of the bull via semen are reviewed in this article. Th e article describes the results of astudy of cryopreserved semen samples from diff erent regions of Ukraine for the period 2013 to 2016. Th e strategy of regular testing of semen donors under offi cial veterinary supervision has been adopted by governments worldwide as a means of avoiding the spread of pathogens and reducing excessive contamination of semen by ubiquitous bacteriadoi:10.46784/e-avm.v9i2.90 fatcat:2hjzwhqbczhopb6dlyr2on444u