For administration to cattle weighing between 100 kg and 400 kg at the time the bolus is given. Designed for dosing prior to turnout of cattle in their second grazing season. In grazing cattle, the device will deliver five doses of oxfendazole for the treatment of both adult and immature gastro-intestinal roundworms, lungworms and tapeworms at regular intervals of approximately three weeks during a period of approximately fifteen weeks, the first dose being released around three weeks after administration. The device thus delivers a programmed therapeutic anthelmintic dosing regime over a period of approximately fifteen weeks. Oxfendazole is an established treatment for: Gastro-intestinal roundworms: Ostertagia, Haemonchus, Trichostrongylus, Nematodirus, Cooperia, Capillaria, Oesophagostomum, Chabertia, Trichuris. Lungworms: Dictyocaulus viviparus. Tapeworms: Moniezia, heads and segments. At the recommended dose rate in cattle, oxfendazole is effective against inhibited/arrested larvae of Cooperia and usually effective against inhibited/arrested larvae of Ostertagia. It is also ovicidal against nematode eggs. Cattle (meat): 6 months Milk: not for use in cattle producing milk for human consumption, nor for cattle within six months of an expected calving date which precedes the production of milk for human consumption.