Do not keep these females. Alternatively, these open cows could be culled. Additionally, in some herd situations, artificial insemination can be used to clear up an infected herd and heat synchronization can be helpful in this regard. Many studies have confirmed that younger bulls are less able to carry and transmit the disease. Keep fences in good repair.
Good fences make good neighbors.
Culture new bulls and old bulls prior to the breeding season, at the semen exam time. Be very suspicious of new cows or bulls, especially somebody else's cull. Do not loan, rent, or borrow bulls. Trichomoniasis is a complex disease problem and your veterinarian should always be consulted regarding decisions about preventing, controlling, or diagnosing this disease. Dr. Bob BonDurant School of Vet Medicine, Univ.