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Clinical and morphological features of salmonellosis in cows and calves affected by heat stress

https://doi.org/10.29326/2304-196X-2023-12-1-73-78

Abstract

Exposure to abnormally high temperatures in the Middle Urals has ledtochronic heat stress in cattle. Despitethe measures taken toprotect thedairy herdfrom overheating (fans, irrigationwith coolwater, livestocksunshades), the heatstressunderminedtheimmunityofanimals, thus, leadingtoan excessiverisein Salmonella population in the gastrointestinal tract, increasedin test in alpermeability, and could also bethecause of increasedvirulence of such serotypes as – Salmonella choleraesuis, that are not typical for cattle. The simultaneous presenceof twopathogensof Salmonella entericasubsp. entericaspecies: i.eSalmonella enteritidis and Salmonella choleraesuis – causeda number of clinical and morphological changesin adultcows. In cows, the infection manifested itself by persistent diarrhea with mucus, reduced milkproduction and intoxication. In calves, the disease was accompanied by septic signs, severein toxication, hyperthermia (40.5–41.0 °C), severed ehydration (morethan 7%) and death. Histopathological examination of bovineparenchymal organs revealed changes typical for salmonellos is pathological process: specific salmonella granulomas were foundin parenchymalorgans (liver, spleen). Some pathological processestypical for sepsiswere foundin other parenchymalorgans (kidneys, heart). The nature of pathological changes in dicates that there is as epticprocess that spreads both hematogenically and lymphogenically, and the structure of granulomas most likely indicates that such apathogen as Salmonelacholeraesuis circulates in cattle. 

About the Authors

L. I. Drozdova
Federal State Budgetary Scientific Institution “Ural Federal Agrarian Scientific Research Centre, Ural Branch of the Russian Academy of Sciences” (FSBSI UrFASRC, UrB of RAS)
Russian Federation

Lyudmila I. Drozdova, Doctor of Science (Veterinary Medicine), Professor, Leading Researcher

Ekaterinburg



E. N. Shilova
Federal State Budgetary Scientific Institution “Ural Federal Agrarian Scientific Research Centre, Ural Branch of the Russian Academy of Sciences” (FSBSI UrFASRC, UrB of RAS)
Russian Federation

Evgenia N. Shilova, Doctor of Science (Veterinary Medicine), Associate Professor, Leading Researcher

Ekaterinburg



I. A. Shkuratova
Federal State Budgetary Scientific Institution “Ural Federal Agrarian Scientific Research Centre, Ural Branch of the Russian Academy of Sciences” (FSBSI UrFASRC, UrB of RAS)
Russian Federation

Irina A. Shkuratova, Doctor of Science (Veterinary Medicine), Professor, Associate Member of the Russian Academy of Sciences, Director of the Ural Scientific Research Veterinary Institute

Ekaterinburg



M. V. Ryaposova
Federal State Budgetary Scientific Institution “Ural Federal Agrarian Scientific Research Centre, Ural Branch of the Russian Academy of Sciences” (FSBSI UrFASRC, UrB of RAS)
Russian Federation

Marina V. Ryaposova, Doctor of Science (Biology), Associate Professor, Leading Researcher

Ekaterinburg



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Review

For citations:


Drozdova L.I., Shilova E.N., Shkuratova I.A., Ryaposova M.V. Clinical and morphological features of salmonellosis in cows and calves affected by heat stress. Veterinary Science Today. 2023;12(1):73-78. https://doi.org/10.29326/2304-196X-2023-12-1-73-78

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ISSN 2304-196X (Print)
ISSN 2658-6959 (Online)