Effect of agro-climatic conditions on the incidence of brucellosis of reindeer in the arctic regions of Yakutia

The spread of brucellosis in reindeer depending on agroclimatic conditions of their housing was studied. The experiment was conducted in Momsky, Nizhnekolymsky and Eveno-Bytantaysky districts of Yakutia in 2012–2019. It was shown that the annual air temperature for the studied period in all districts was higher than the norm by 1.1 ... 1.9 °С due to its more significant increase in the cold period (by 1.5 ... 2.8 °С) compared to the warm period (by 0.5 ... 0.6 °С). The highest temperature increase was registered in April (by 2.8 ... 4.4 °C) and November (by 2.2 ... 4.1 °C), in spring-summer period - in May (by 0.9 ... 1.7 °C), in July it was 0.2 ... 1.0 °С below the norm. The annual precipitation on the territory of the Eveno-Bytantaysky district changed slightly, and on the territory of the Momsky and Nizhnekolymsky districts increased by 40 and 70 mm, respectively. The incidence of brucellosis of reindeer, depending on the place (area) where reindeer are kept and weather conditions, ranged from 0 to 3.86% (coefficient of variation of 131%), fewer sick animals were in the Nizhnekolymsky district (0.20%), more – in Eveno-Bytantaysky (1.15%). There was a negative correlation (r = –0,19...–0,42) between the incidence of brucellosis in reindeer and the temperature during the cold months and the annual temperature, with the temperature of the spring-summer months - medium positive (r = 0,30...0,53) with a reliable level in July. In general, temperature had a greater effect on morbidity (r2 = 0.115) than precipitation (r2 = 0.092), but a significant inverse relationship (r = –0.48; r2 = 0.23) was found between annual precipitation sum and animal morbidity. In all months there was also a negative correlation between these indicators (r = –0.13...–0.41), except for April and August (r = 0.10 and 0.11, respectively). In winter months, this dependence was more significant (r = –0.30...–0.40) than in summer (r = –0.13...–0.27).

1. Khoch A.A., Sleptsov E.S. Brucellosis of reindeer in Yakutia. Yakutsk, 2001, 216 р. (In Russian).

2. Fedorov A.I., Iskandarov M.I., Iskandarova S.S. Properties of brucella cultures isolated from reindeer. Veterinariya = Veterinary medicine, 2022, no. 5, pp. 20–27. (In Russian).

3. Pappas G., Akritidis N., Bosilkovski M., Tsianos E. Brucellosis. The New Ingland Journal of Medicine, 2005, no. 352, pp. 2325–2336.

4. Hurtado R. Brucellosis – new and old issues regarding diagnosis and management. Harvard education online (31 октября 2001 г.): http:/ www.mgh.harvard.edu / id / images / brucellosis.pdf.

5. Sleptsov E.S., Vinokurov N.V., Fedorov V.I., Grigoriev I.I., Zakharova O.I. Epizootic state of brucellosis of reindeer in the Republic of Sakha (Yakutia). Agrarnyi vestnik Urala = Agrarian Bulletin of the Urals, 2018, no. 8 (175), pp. 57–61. (In Russian).

6. Zabrodin V.A., Laishev K.A., Gulyukin M.I., Gulyukin A.M., Iskandarov M.I., Sleptsov E.S., Vinokurov N.V., Fedorov V.I., Bochkarev I.I., Zakharova O.I. Brucellosis of deer and some wild animals in the Yenisei North. Novosibirsk: Publishing house of ANS "SibAK", 2018, 290 p. (In Russian).

7. Sleptsov E.S., Iskandarov M.I., Vinokurov N.V., Plemyashov K.V., Pavlova A.I. Analysis of materials on the effectiveness of the use of vaccine strains and systems for the prevention and elimination of brucellosis of animals in the territory of the Russian Federation. Veterinariya i kormlenie = Veterinaria i kormlenie, 2020, no. 5, pp. 45–48. (In Russian). DOI: 10.30917/ATTVK-1814-9588-2020.

8. Krasikov A.P., Zuev A.V., Ermakova T.V. Epizootological analysis of the main bacterial and viral infectious diseases of cattle in the Omsk region. Veterinarno–sanitarnye meropriyatiya po preduprezhdeniyu antropozoonozov i nezaraznykh boleznei zhivotnykh = Veterinary and sanitary measures to prevent anthropozoonosis and non– infectious animal diseases, 2018, pp. 39–47. (In Russian).

9. Panin G.N., Vyruchalkina T.Yu., Solomonova V.I. Regional klimatic change in the Northern Hemisphere and their relationship with circulation indices. Problemy ekologicheskogo monitoringa i modelirovaniya ekosistem = Problems of ecological monitoring and modeling of ecosystem, 2010, Vol. 23, pp. 92–108. (In Russian).

10. Kirillina K.S. Trends in climate change in the Republic of Sakha (Yakutia). Voprosy geografii Yakutii = Questions of the geography of Yakutia. Yakutsk, 2013, is. 11, pp. 115–121. (In Russian).

11. Global climate change and risk forecast in Russian agriculture / edited by acad. A.L. Ivanova, V.I. Kiryushina M.: Rosselkhozakademiya, 2009, pp. 331–342. (In Russian).

12. Abidzhanov M.S., Grinko V.K., Nazarova S.A. Rozbengal test in the diagnosis of animal brucelleosis. Trudy UzbNIVI = Proceedings of UzbNIVI, 1980. is. 30. pp. 8–12. (In Russian).

13. Vinokurov N.V. Study of the diagnostic efficiency of the reaction of indirect hemagglutination in brucellosis. Yakutskii meditsinskii zhurnal = Yаkut Medical Journal, 2008, no. 4, pp. 72–73. (In Russian).