Pathophysiological features of heat stress in cows with hepatobiliary disorders

УДК 619:616.36;636.2.034
DOI 10.33861/2071-8020-2022-3-21-23

Kuzminova E.V., Rud E.N., Semenenko M.P., Abramov A.A., Rogaleva E.V.

Summary. Results of the study of the pathophysiological features of heat stress in cows with hepatobiliary disorders are shown in the article. Based on the temperature and humidity index calculated from the indicators of the average daily temperature and humidity of the environment, it is shown that in the summer period in the conditions of the Krasnodar region dairy cattle are under heat stress, with a predominance in severity of moderate heat stress. Two groups of cows 30 animals each were formed to conduct studies with THI less than 68 on the principle of paired analogues: the first group - healthy livestock; the second - with hepatobiliary disorders. Blood samples were taken from 10 cows from each group at the beginning of the experiment (THI comfort zone) and at its end (heat stress). It was determined that with heat stress in cows their milk productivity decreases by 17.8-18.6%. Correlation analysis showed an inverse relationship for such characteristics as daily milk yield, the number of somatic cells, the mass fraction of fat, protein and lactose in milk with THI, and a direct relationship for the number of somatic cells. An increase in the concentration of cortisol in the blood serum by 27.5-33.3% indicates the strain of the adaptive potential of the cows’ body under heat stress, while the background level of this hormone in cows with hepatobiliary disorders was 1.6 times higher than in healthy animals. The concentration of adrenocorticotropic hormone did not significantly change. With heat stress cows have an increase in the content of triiodothyronine in the blood, which is able to mobilize the reserves of the body and thereby participate in the elimination of homeostasis disorders caused by the stress factor. The reported study was funded by RFBR according to the research project № 20-316-90009.

Keywords: heat stress, large horned cattle, cows, hepatobiliary disorders, milk productivity, hormones, cortisol, adaptation, triiodothyronine, homeostasis, temperature humidity index.

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Author affiliation:

Kuzminova Elena V., D.Sc. in Veterinary Medicine, docent, chief scientific researcher of the Department of Pharmacology of the Krasnodar Research Centre for Animal Husbandry and Veterinary Medicine; 1, 1-ya Liniya st., Krasnodar, 350004; phone: 8-918-4198369; e-mail: niva1430@mail.ru.

Semenenko Marina P., D.Sc. in Veterinary Medicine, docent, Head of the Department of Pharmacology of the Krasnodar Research Centre for Animal Husbandry and Veterinary Medicine; 1, 1-ya Liniya st., Krasnodar, 350004; phone: 8-918-4612663; е-mail: sever291@mail.ru.

Abramov Andrey A., Ph.D. in Veterinary Medicine, senior scientific researcher of the Department of Pharmacology of the Krasnodar Research Centre for Animal Husbandry and Veterinary Medicine; 1, 1-ya Liniya st., Krasnodar, 350004; phone: 8-902-4061527; e-mail: abramov1527@mail.ru.

Rogaleva Evgeniya V., D.Sc. in Veterinary Medicine, leading scientific researcher of the Department of Pharmacology of the Krasnodar Research Centre for Animal Husbandry and Veterinary Medicine; 1, 1-ya Liniya st., Krasnodar, 350004; phone: 8-952-8287972; е-mail: jane-tyapkina@yandex.ru.

Responsible for correspondence with the editorial board: Rud Ekaterina N., postgraduate student of the Department of Pharmacology of the Krasnodar Research Centre for Animal Husbandry and Veterinary Medicine; 1, 1-ya Liniya st., Krasnodar, 350004; phone: 8-918-9590349; e-mail: rudkaterina@bk.ru.