摘要:The paper presents the results of determining the level of molecules of medium mass (MMM) in the blood serum of poultry with experimental mycotoxicosis. The study revealed a relationship between the concentration of MMM in the blood serum and the severity of the pathological process in poultry with different types of mycotoxicosis. The most pronounced changes occur in mycotoxicosis due to the combined intake of T-2 toxin and aflatoxin B1 into the poultry body, even when their concentration individually does not exceed the maximum permissible level. In this case, a significant increase in the concentration of MMM in the blood serum is recorded – in 1.8 times (λ = 254 nm) and in 2.2 times (λ = 280 nm), with an increase in the MMM distribution index. Next, according to the severity of endogenous intoxication, follows mycotoxicosis caused by aflatoxin B1, and the lowest values were recorded with T-2 toxicosis.