[Economic importance of parasitism in the cattle breeding]

anthelminthique anthelmintics antielmintici bovin bovini cattle control de plagas controllo dei parassiti fasciolasi fasciolasis fasciolose fasciolosis ganado bovino infecciones por nematodos infezioni da nematodi losses lutte antiravageur nematode infections perdite perte pest control servicios veterinarios servizi veterinari strongylus veterinary services