The article presents original research and for the first time conducted analysis of variation pulsograms by the method of mathematical analysis of heart rate variability of electrocardiogram and correlation analysis. On this basis, breed characteristics of Evenki reindeer of the Republic of Sakha (Yakutia) were established. For analysis and recording of ECG in the Evenki reindeer under study, the program "CONAN-4.5" was used in the system of frontal leads according to the method of M. P. Roshchevsky. Clinical research were carried out according to the methods of clinical examination of animals by B. V. Usha and included examination, palpation, percussion and auscultation of the cardiac region. Based on the conducted studies during the analysis of electrocardiograms of Evenki reindeer, the following features of the primary indicators of variational pulsometry were established: mode – 1.01±0.048 sec; mode amplitude – 28.00±2.84%; variation range – 0.683±0.07 sec; index of stress of the body's regulatory systems – 21.75±2.34 conventional units; heart rate – 56.13±2.37 beats/min. Secondary indicators of variation pulsometry are determined and analyzed: square root of the sum of differences in a consecutive series of cardiointervals – 180.81±29.88 ms; the number of pairs of cardiointervals with a difference of more than 50 ms in percent of the total number of cardiointervals in the array – 63.29±4.83%; autonomic equilibrium index – 43.25±5.58 conventional units; autonomic rhythm indicator – 1.75±0.16 conventional units; regulatory process adequacy index – 27.88±2.64 conventional units. A. Ya. Kaplan’s indices were evaluated: respiratory modulation index – 8.21±1.16; sympathoadrenal tone index – 40.88±9.11; slow-wave arrhythmia index – 9.78±3.04; cardiac stress index – 10.30±1.72% and cardiac arrhythmia index – 2.81±0.69%.

Stepura Evgeniy E., Fedorov Valery I., Dmitrieva Tuyara I.

1. Emelyanova A. S., Nikitov S. V. Analysis of the relationship between primary indicators of variational pulsograms of cows and milk productivity when using the Vitartil supplement. Izvestiya Orenburgskogo gosudarstvennogo agrarnogo universiteta, 2012;3:250–251. EDN PBPEOF (in Russ.).
2. Stepura E. E. Analysis of the dynamic range of secondary indicators of variational pulsograms of Jersey cows. Estestvennye i tekhnicheskie nauki, 2017;6(108):28–31. EDN YTVWDF (in Russ.).
3. Stepura E. E. Analysis of heart rate variability in Jersey cows. Vestnik Orenburgskogo gosudarstvennogo universiteta, 2017;11(211):110–114. EDN YLQIEY (in Russ.).
4. Emelyanova A. S., Stepura E. E. Initial vegetative tone of Jersey cows based on stress index and its analysis. Estestvennye nauki, 2017;4(61):128–133. EDN YOOVCW (in Russ.).
5. Emelyanova A. S. Assessment of the initial vegetative tone of cows with different milk productivity according to the stress index of the regulatory systems of the body. Estestvennye i tekhnicheskie nauki, 2009;6(44):148–149 (in Russ.).
6. Specific and climatic adaptations of the animal organism. Physiological and genetic research, Novosibirsk, 1967, 298 p. (in Russ.).
7. Roshchevsky M. P., Tumakova N. M. Electrocardiograms and gas exchange in domestic reindeer in winter. Proceedings from 4-ya Vsesoyuznaya konferentsiya po fiziologicheskim i biokhimicheskim osnovam povysheniya produktivnosti sel'skokhozyaistvennykh zhivotnykh. (PP. 276–278), Borovsk, 1966 (in Russ.).
8. Gonzalez-Jassi H. A., Leblan N., Alcantar B. E., Torres R. S. G. Using smartphonebased electrocardiography and chest X-ray to assess heart function and morphology in geriatric spotted deer (Cervus nippon). American Journal of Veterinary Research, 2021;83;2:127–132. doi: 10.2460/ajvr.21.08.0128.
9. Baevsky R. M., Ivanov G. G. Heart rate variability: theoretical aspects and possibilities of clinical application. Ul'trazvukovaya i funktsional'naya diagnostika, 2015;2:108–127. EDN VWTHLT (in Russ.).