Have an accredited veterinarian vaccinate these heifers when they are between the ages of four and 12 months. If you purchase replacements, do so from a reputable producer. Be certain that cattle you purchase come from clean herds and that the females were vaccinated as calves and are negative to the Bang's test. Leptospirosis may be a widespread problem, especially in unvaccinated herds. It causes repeat breeders, low-grade uterine infections, abortions, mastitis and occasionally systemic infection.
Leptospirosis can build up unrecognized in a herd.
To prevent the disease, vaccinate cattle with proper bacterins every six months. Because these diseases are so complex, be careful when using IBR and BVD vaccines, which can be purchased as either killed or modified-live vaccines. Consult a veterinarian for advice on the vaccination procedure for a particular herd. Vibriosis is a venereal disease causing infertility and occasionally, abortion. It is spread from an infected bull to a cow during the breeding act.