Liver Abscesses in Cattle
Overview of Liver Abscesses in Cattle
Liver abscesses in cattle are localized bacterial infections caused mainly by Fusobacterium necrophorum, arising from bacterial translocation from the rumen to the liver. These abscesses are primarily associated with diets high in grain, which predispose cattle to rumenitis. Prevention through managing high grain rations is effective, and treatment is rarely pursued since clinical signs are often absent. In affected cattle, liver abscesses are common findings at slaughter.
Prevalence and Impact
The condition can occur in any breed and age of cattle but is most prevalent in feedlot and dairy cattle. Liver abscesses reduce production efficiency, leading to condemnation of affected livers during slaughter and can cause secondary complications like caudal vena caval thrombosis.
Etiology and Pathogenesis
Fusobacterium necrophorum is the main cause, often colonizing areas of necrosis in the liver stemming from rumenitis. Rumenitis is usually due to rapid carbohydrate fermentation leading to acidification. Other infection sources include foreign body penetration and infections from neonatal conditions.
Clinical Findings and Diagnosis
Cattle with liver abscesses usually show few or no clinical signs. However, some may exhibit signs such as:
Weight loss
Poor coat condition
Fever
Decreased appetite
Lethargy
Diagnoses typically occur at slaughter, with highlights on diagnostic methods like serum protein values and ultrasonography, although these methods may not capture abscesses on the liver’s left side. Feedlot cattle experience decreased feed efficiency, resulting in financial losses due to condemned livers.
Treatment and Prevention
Treatment mainly focuses on prevention, which includes dietary modifications and usage of specific antimicrobials like tylosin and virginiamycin to reduce abscess incidence. Managing ruminal acidosis through careful diet and feeding practices is crucial to lowering the risk of rumenitis and liver abscesses.