Recovery from severe dysspermatogenesis in a bull: A case report

An 18-month-old Holstein bull with a history of producing ejaculates of freezable quality was presented with marked oligozoospermia, teratozoospermia and akinozoospermia. Ejaculates also contained many spheroids and medusa forms. The severe dysspermatogenesis was associated with Haemophilus somnus infection based upon positive semen cultures and serology. The bull was treated systemically with the antibiotic, ceftiofur, for 15 days. Approximately 3 months after initial presentation, the bull was again producing semen of freezable quality. The case presented provides one example in which severe dysspermatogenesis resolved to the point of apparently normal spermatogenesis.