Hematological status of cows with different stress tolerance
O.O. Borshch, O.V. Borshch, O.I. Sobolev, B.V. Gutyj*, S.V. Sobolievа, L.M. Kachan, Yu.O. Mashkin, V.V. Bilkevich, L.S. Stovbetska, O.A. Kochuk-Yashchenko, S.H. Shalovylo, N. Cherniy, T.V. Matryshuk, Z.A. Guta and P.V. Bodnar
This study aimed to compare the hematological status of cows of different stress levels during the period of increasing milk yield (on the 60th-70th day of lactation) under the conditions of intensive maintenance technology with voluntary milking in a robotic installation. Genetic factors (breed, line) and paratypes (age, stage of lactation, type of feeding, time of year, climatic conditions) influence the hematological profile of high-yielding cows and tolerance to stress. According to the results of our research, the content of total protein and its fractions in the serum of cows' blood with different tolerances for stress levels corresponds to the recommended values, indicating the balance of metabolic processes in the body. The ratio of animal feeding was deficit-free in crude protein, as evidenced by a sufficient level of albumin in cow serum of cows (33.59-33.87 g/L) of all types of resistance to stress. Cows with a high tolerance to stress are characterized by values closer to the recommended values according to biochemical and mineral parameters of blood than animals with medium and low resistance to stress. The hematocrit content in the blood of cows with a high tolerance for stress is 1.74 and 5.08% higher than that of analogs with resistance to medium and low stress resistance, which indicates their more minor adaptation to intensive milk production technology and voluntary milking system.