EN
Clinical examinations of 12 calves, infected experimentally with dictiocaulosis and of 70 calves - bearers of natural infection as well as the biochemical studies of blood showed: 1. that the course of experimental dictiocaulosis related to the number of larvae used for infection (the doses exceeding 100 larvae per l kg of body weight give rise to severe form of the disease, leading occasionally to death); 2. changes in the content of sugar, inorganic phosphorus, acid-soluble phosphorus and lactic acid in the blood of animals appeared concurrently with the first clinical symptoms of dictiocaulosis and were related to the course of the disease. It has been demonstrated that in the course of dictiocaulosis in calves, sue both to experimental and natural infection, important disturbances in the carbohydrate-phosphate metabolism make their appearance in the body of disease bearer.