The protein spectrum of blood serum was studied in healthy cows and those suffering from leucosis. The total amount of protein at the early stages of the disease is established to be unchanged. But with lympholeucosis the content of the globulin fraction increases with a simultaneous decrease in the amount of albumins within 20%. The globulin fraction content rises due to immunoglobulin G. The albumin: globulins coefficient is 0.56 for animals with leucosis and 0.84 for the healthy ones. A problem on possible qualitative changes in this fraction similar to those occurring with other forms of malignant growth is under discussion.
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