Hematological and immunological parameters of BLV-infected lactating mastitis cows

The studies were conducted to examine morphology and biochemistry of blood in BLV-infected lactating mastitis cows. The object of the research is Holsteinized lactating cows aged from four to six years from a livestock farm in the Amur region that respond positively in the immunodiffusion reaction (RID). The research was carried out in summer. The cows were divided into five groups, with 5 cows in each group: control - clinically healthy, BLV-free cows; first - infected with BLV without clinical signs of enzootic leukemia and other diseases; the second group is infected with BLV with subclinical mastitis. Milk analysis for mastitis was made at the end of milking from each quarter using a fast mastitis test (BMT) "Masttest". Hematological examinations were performed using usual routine method. Hematological studies showed that the studied BLV-infected lactating cows had an initial, aleukemic stage of the leukemic process, in which the concentration of leukocytes in blood was within the physiological norm, and number of lymphocytes was 80.8±4.31% (p