Even a switch in bull breeding to AI for 6 months will greatly reduce the effects of trich. Vibrio is a venereal, bacterial disease spread by infected bulls during breeding of cows. There are usually no clinical signs of disease in infected cows. The primary sign is early embryonic death resulting in repeat breedings. Occasional mid-ter m abortions are seen.
Diagnosis is by examination of preputial washing from suspected infected bulls.
Repeated cultures are often needed for a certain diagnosis. Three cultures can be assured to diagnose one infected bull from a group of 1,000 bulls. When aborted calves ar e found, a diagnosis can sometimes be made from culture of abomasal fluids. Control is through AI breeding and vaccination. To be effective, vaccinations should be given prior to breeding each year.