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Aim. To conduct studies on the content of radionuclides 90 Sr, 137 Cs, 210 Pb and determine the total beta-activity in objects (samples) of the external environment, as well as to investigate the effect of radioactive isotopes on the spread of bovine leukemia in the Republic of Dagestan. Materials and Methods. Samples (haylage, natural grass, silage, compound feed, milk, etc.) that were obtained from various locations of the Republic of Dagestan were used for radiological research. The method of research was radiochemical analysis using the universal spectrometric complex "Gamma Plus", etc. For bovine leukemia the principal material was the reporting data of the Republican Veterinary Laboratory, supplemented by our own research from 1988 to 2008. The research was carried out by generally recognized methods in serology and hematology. Results. After the studies were conducted, a high content of radionuclides 90 Sr and 137 Cs was found in environmental objects from 1986-198, and the activity of nuclide 210 Pb in the ecosystem of the republic increased tenfold compared to 1985. An important indicator such as the total beta-activity in the republic also increased in the period (from 1986-1988) after the accident at the Chernobyl nuclear power station. In 1988, we recorded the maximum number (32.2%) of infected animals with the bovine leukemia virus and in subsequent years the percentage of hemo-diseased heads of cattle in the farms of the republic increased. Conclusion. Thus, there is a causal relationship between the activity of radionuclides and the decrease in the immune status of animals, which may lead to the increase in the spread of bovine leukemia in the republic.
Aim. To conduct studies on the content of radionuclides 90 Sr, 137 Cs, 210 Pb and determine the total beta-activity in objects (samples) of the external environment, as well as to investigate the effect of radioactive isotopes on the spread of bovine leukemia in the Republic of Dagestan. Materials and Methods. Samples (haylage, natural grass, silage, compound feed, milk, etc.) that were obtained from various locations of the Republic of Dagestan were used for radiological research. The method of research was radiochemical analysis using the universal spectrometric complex "Gamma Plus", etc. For bovine leukemia the principal material was the reporting data of the Republican Veterinary Laboratory, supplemented by our own research from 1988 to 2008. The research was carried out by generally recognized methods in serology and hematology. Results. After the studies were conducted, a high content of radionuclides 90 Sr and 137 Cs was found in environmental objects from 1986-198, and the activity of nuclide 210 Pb in the ecosystem of the republic increased tenfold compared to 1985. An important indicator such as the total beta-activity in the republic also increased in the period (from 1986-1988) after the accident at the Chernobyl nuclear power station. In 1988, we recorded the maximum number (32.2%) of infected animals with the bovine leukemia virus and in subsequent years the percentage of hemo-diseased heads of cattle in the farms of the republic increased. Conclusion. Thus, there is a causal relationship between the activity of radionuclides and the decrease in the immune status of animals, which may lead to the increase in the spread of bovine leukemia in the republic.
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.
An epizootiological survey of livestock farms of Dagestan was conducted, the main infectious diseases common in the region were considered, and measures taken to protect against them were described. At present, the Veterinary Service is undertaking systematic efforts to prevent the occurrence and spread of infectious diseases such as brucellosis, leukosis, rabies, pasteurellosis, blackleg, bradsot and enterotoxemia in the Republic. Among the above-mentioned diseases reported in 2023, brucellosis and leukosis are responsible for the vast majority of outbreaks and diseased animals detected in them. In particular, the following diseases have the largest share in the nosological profile of quarantinable infectious diseases based on the number of detected infected localities during the period under study: brucellosis (52.63%), bovine leukosis (30.70%), rabies (8.77%), enterotoxemia (3.51%), pasteurellosis (1.75%), bradsot (1.75%) and blackleg (0.88%). In total, 1,812 animals were affected with quarantinable infections and 35 animals died in 114 infected localities. Most often over the past year, quarantinable infections were reported in cattle (69.59% of cases) and small ruminants (29.36%); in 1.05% of cases, the diseases affected horses, cats, wild animals and birds. In order to maintain animal disease freedom and sustainable growth of livestock production, the Veterinary Committee of the Republic of Dagestan annually implements measures to prevent the occurrence and spread of 75 diseases of animals and birds, including 10 highly dangerous ones. Anti-epizootic measures taken in the past year included a total of 93.8 million vaccinations and 6.2 million tests performed in the diagnostic institutions. Plans for the prevention of highly dangerous and other contagious diseases of animals and birds were fully implemented.
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