Bovilis BVD is used for vaccination of cows and heifers to protect their foetuses against infection with Bovine Viral Diarrhoea (BVD) virus inside the cow’s womb. Bovilis BVD has been proven to prevent unborn calves from becoming persistently infected (PI). This is most important as PI calves either die soon after birth or act as a source of infection for the rest of the herd. Infecting the rest of the herd may lead to abortions, reduced milk yield and increased return to service, poorer pregnancy rates, mastitis, coughing and other problems in cows and the creation of more PI calves.