Small groups of bulls were exposed to natural infection with arboviruses. The bulls were bled and ejaculated regularly and the blood and semen were processed for virus isolation. Over a 5-year observation period, virus isolation and serology indicated that the 29 exposed bulls had experienced 79 viraemic episodes with the viruses of the bluetongue, epizootic haemorrhagic disease, Palyam and Simbu serogroups and an incompletely characterised rhabdovirus. In no instance was there unequivocal evidence of bluetongue virus contamination of semen, despite 18 infections in the study period.
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