Bacteriological study and liver abscesses prevalence in cattle slaughtered in Semnan abattoir

Document Type : Original Article

Authors

1 Graduated from the Faculty of Veterinary Medicine, University of Semnan, Semnan, Iran

2 Department of Clinical science, Semnan University, Semnan, Iran

3 Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran

4 Food Hygiene Department, Faculty of Veterinary Medicine, Semnan University, Semnan, Iran

Abstract

Digestive system of ruminants is adapted for digesting diets that mainly consist of fodder. Feeding diets with high amounts of grain materials to ruminants causes gastric acidosis and liver abscesses.
The aim of the present study was to identify bacterial agents isolated from liver abscesses and to investigate its prevalence in slaughtered cows in Semnan abattoir.
In this study, a total of 200 cows were sampled. Rumen acidity was measured immediately after slaughter with a portable pH meter. During the inspection of the carcass, the liver of the cows was examined, and if there was an abscess, the related information was recorded. Then the abscess was completely separated from the liver along with a part of healthy tissue and transferred to the laboratory with ice. In the laboratory, culture of liver abscesses was performed according to the standard method.
Out of 200 cattle, 63 (32.5%) had subacute acidosis, of which 40 (31.4%) were males and 23 (31.5%) were females. A total of 12 cattle (6.5%) were suffering from liver abscess. Fusobacterium necrophorum was isolated from 9 (69.2%) abscessed livers and Troperella pyogenes from 6 (46.1%) abscessed livers as the most common cause of abscess.
The prevalence of subacute acidosis and liver abscesses in cows slaughtered in Semnan abattoir is 32.5% and 6.5%, respectively. Fusobacterium necrophorum and Troperella pyogenes are the most important causes of liver abscesses in cattle.

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