Calf diarrhoea is one of the most important causes of calf mortality in pre-weaned calves. Early days of calf life are very important, when morbidity and mortality are the greatest. In young calves mortality varies from 8.7 to 64 per cent throughout the world. There are many diseases that can affect the calf during its infancy however; calf diarrhoea is the most important disease problem in dairy calves that causes more economic losses to the calf producer than any other problem. Calf diarrhoea causes 75 per cent of mortality of dairy calves having age of less than three weeks. The prevalence...