In new born Calves: Prevention of diarrhoea due to diagnosed Cryptosporidium parvum, In farms with history of cryptosporidiosis.Administration should start in the first 24 to 48 hours of age. Reduction of diarrhoea due to diagnosed Cryptosporidium parvum. Administration should start within 24 hours after the onset of diarrhoea.In both cases, the reduction of ocysts excretion has been demonstrated.