Is an extremely common virus in Australian herds. It is a disease that can manifest in many different ways including abortions, dummy calves, deformed calves and illthrifty calves that may suffer from pneumonia and diarrhoea. it is estimated that 80% of australian herds have this disease on it. It often becomes endemic on a herd. Whether to institute a vaccination protocol is a difficult question to answer. It depends on your individual circumstances.
The initial step requires blood testing of your herd to find out whether you have pestivirus on it. Then it depends on whether you have an open or closed or herd and just how many animals you have in your herd that are exposed. If you have any questions you are best to talk with a vet about whether you should be starting a program.