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The spread of the bovine leukemia virus impedes the development of livestock production and causes considerable losses. Despite the measures implemented, the problem of bovine leukosis eradication remains relevant in different regions of Russia. The article presents data on distribution of enzootic bovine leukosis in the Republic of Dagestan. Over the past five years, the lowest level (1.02%) of leukemia virus infection in cattle in the Republic was recorded in 2020. Laboratory tests for bovine leukosis were carried out in 41 raions and 7 municipal districts: no disease was diagnosed in 12 raions and 4 municipal districts, and the animal seropositivity index in the rest of areas was less than 1%. A high level of animal infection with the leukemia virus was recorded in the following raions: Dakhadaevsky (10.3%), Shamilsky (7.9%), Tarumovsky (3.1%), Kizlyarsky (2.3%), Babayurtovsky (2.2%), as well as in the town of Yuzhno-Sukhokumsk (3.8%). In other districts, the parameter’s values ranged from 1 to 2%. In total, 524,930 animal sera samples were serologically tested using the immunodiffusion method, out of which 5,362 samples were seropositive in 2020. 1,265 sera samples from animals infected with the leukemia virus were tested using the hematological method, 251 animals (19.8%) with persistent leukocytosis were identified, which is the average for the past years. Comparative analysis of the morbidity rate for bovine leukemia virus in farms of different categories showed that in public farms of the republic the percentage of infection level was higher (3.3%) than in the individual sector (0.7%). Thus, bovine leukemia infection level in the republic tends to decrease. Nevertheless, the infection and morbidity rates in cattle remain high in some raions and municipal districts, in particular, in the public sector.

Êëþ÷åâûå ñëîâà: ëåéêîç êðóïíîãî ðîãàòîãî ñêîòà, âèðóñ ëåéêîçà êðóïíîãî ðîãàòîãî ñêîòà (ÂËÊÐÑ), ãåìàòîëîãè-÷åñêèå è ñåðîëîãè÷åñêèå èññëåäîâàíèÿ, ðåàêöèÿ èììóíîäèôôóçèîííîé ïðåöèïèòàöèè (ÐÈÄ), Ðåñïóáëèêà Äàãåñòàí. Key words: leucosis of cattle, bovine leukemia virus (BLV), hematologic and serologic studies, immunoprecipitation test (AGID), Dagestan Republic. Ðåçþìå. Ëåéêîç êðóïíîãî ðîãàòîãî ñêîòà ñ 1988 ïî 2017 ãã. ðåãèñòðèðóåòñÿ ïðîäîëaeèòåëüíîå âðåìÿ â áîëüøèíñòâå õîçÿéñòâ Ðåñïóáëèêè Äàãåñòàí ñðåäè âñåõ ïîëîâîçðàñòíûõ è ïðîèçâîäñòâåííûõ ãðóïï ñ òåíäåíöèåé ê øèðîêîìó ðàñïðîñòðàíåíèþ. Ïîëó÷åííûå äàííûå ñâèäåòåëüñòâóþò îá îñîáåííîñòÿõ è çàêîíîìåðíîñòÿõ ðàçâèòèÿ è ïðîÿâëåíèÿ èíôåêöèîííîãî è ýïèçîîòè÷åñêîãî ïðîöåññîâ èíôåêöèè âèðóñà ëåéêîçà êðóïíîãî ðîãàòîãî ñêîòà (ÂËÊÐÑ), ÷òî îáóñëàâëèâàåò ñïåöèôèêó ïðîâåäåíèÿ ïðîòèâîëåéêîçíûõ ìåðîïðèÿòèé â ðåñïóáëèêå. Òàê, çà ïîñëåäíèå 9 ëåò îáñëåäîâàíèÿ â ÐÈÄ 8,9 (6,7-12,2) òûñ. ãîëîâ êðóïíîãî ðîãàòîãî ñêîòà åaeåãîäíî âûÿâëÿþò 1,2 (0,4-2,4) òûñ. ïîëîaeèòåëüíî ðåàãèðóþùèõ aeèâîòíûõ, ÷òî ñîñòàâëÿåò 13,5% îò ÷èñëà èññëåäîâàííûõ. Ïîêàçàòåëü èíôèöèðîâàííîñòè åaeåãîäíî ïîääåðaeèâàëñÿ íà óðîâíå 6,5-23,6%. Ãåìàòîëîãè÷åñêèì ìåòîäîì èññëåäîâàëè 246,2 aeèâîòíûõ è ñðåäè íèõ åaeåãîäíî âûÿâëÿëè 78,9 (32,1%) áîëüíûõ. Ëåéêîç êðóïíîãî ðîãàòîãî ñêîòà íàíîñèò ñóùåñòâåííûé ýêîíîìè÷åñêèé óùåðá îòðàñëè è òðåáóåò áîëåå àêòèâíîé è ïåðñïåêòèâíîé áîðüáû ñ ýòèì çàáîëåâàíèåì. Äëÿ ýôôåêòèâíîé ðàáîòû ñ ëåéêîçîì êðóïíîãî ðîãàòîãî ñêîòà íåîáõîäèìî ðàçðàáîòàòü Ðåñïóáëèêàíñêóþ öåëåâóþ ïðîãðàììó. Summary. Leucosis of cattle from 1988 till2017 is registered for a long time in the majority of farms of Dagestan Republic among all age and production groups with a tendency to wide distribution. These results indicate that the features and patterns of development and manifestation of infectious and epizootic processes of virus infection of bovine leukemia (BLV), which determines the specifics of the anti-leukemic activities in the republic. So, during last 9 years of study in AGID 8,9(6,7-12,2) thousands of heads of cattle annually show 1,2 (0,4-2,4) thousands of positively reacting animals, which amounts to 13,5% of the surveyed. The infection rate was maintained on6,5-23,6% each

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