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2022, № 96

UDC: 619:636.034: 616.15
GSNTI: 68.41.41

Changes in the parameters of the blood system of highly productive cattle under the influence of heat stress

One of the problems of industrial dairy farming in summer is heat stress. The article assesses changes in the blood system of cattle under the influence of heat stress. It was found that the temperature-humidity index (THI) in the room in which the control animals were kept (spring period) was registered at a level less than 64 c.u. In the room where the animals of the experimental group were kept (summer period), the THI was 79 c.u. - the boundary between moderate and severe heat stress. Animals showed clinical symptoms of heat stress. Rectal temperature, respiratory rate and heart rate were outside the normal range and averaged 39,42оC, 86,45 d/d and 127,65 beats/min, respectively. Cows were depressed, lethargic, reduced feed intake and increased water intake. In the blood parameters of experimental cattle, a decrease in hemoglobin (83,2±9,24 g/l), a shift in the absolute number of erythrocytes (6,10±0,88 109/l) and hematocrit (26,51±2,97%) to the lower limit of the standard value were established. In the composition of the white blood germ, an increase in the relative content of segmented neutrophils (42.20±6.30%), a decrease in monocytes (1.90±0.54%) and lymphocytes (46.30±8.41%) to the lower limit of the standard value ere found. The body of experimental animals was affected by moderate heat stress. This was characterized by rearrangements in the cellular composition of the blood and led to a decrease in the work of the adaptive mechanisms of the animal organism.
Keywords: Heat stress, blood, hematological parameters, highly productive cattle, temperature-humidity index.
DOI: 10.21515/1999-1703-96-284-289

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Authors:

1. Oparina Olga Yurievna, PhD in Veterinary, senior researcher, Federal state budgetary scientific institution "Ural Federal Agrarian Scientific Research Centre, Ural Branch of the Russian Academy of Science".
2. Krasnoperov Alexander Sergeevich, PhD in Veterinary, senior researcher, Federal state budgetary scientific institution "Ural Federal Agrarian Scientific Research Centre, Ural Branch of the Russian Academy of Science".
3. Malkov Sergey Vitalievich, PhD in Veterinary, senior researcher, Federal state budgetary scientific institution "Ural Federal Agrarian Scientific Research Centre, Ural Branch of the Russian Academy of Science".
4. Vereshchak Natalya Aleksandrovna, DSc in Veterinary, leading researcher, Federal state budgetary scientific institution "Ural Federal Agrarian Scientific Research Centre, Ural Branch of the Russian Academy of Science".