Dynamics of amino acid profile in milk of BIV- and BLV-BIV-infected cows during storage

Leukemia and viral immunodeficiency of cattle rank to the number of difficult diagnosed infections of farm animals which increases the probability of virus carrying. At present time there are no legislative approved standards for bovine immunodeficiency diagnosis so the milk from sick cows can infect bulk milk obtained from healthy animals. Frequently bovine immunodeficiency virus (BIV) is detected in animals infected by bovine leukemia virus (BLV). The present work reveals that milk of cows infected by retroviruses has an altered amino acid balance of the casein fraction, as well as lower protein stability when stored in a refrigerator. The aim of our research was to assay the amino acid composition and evaluate its stability in milk of BIV-infected and BLV-BIV-co-infected cows, as compared to milk of healthy animals. A total of 6 samples of pure cow milk obtained from 2.8-6.7-year old black-and-white dairy cows infected by bovine immunodeficiency virus ( n = 3) and cows with BLV-BIV coinfection ( n = 3) were tested...