Liver Abscesses in Feedlot Cattle: Welfare and Prevention 2026

Liver abscesses are a common but often undetected welfare problem in feedlot cattle, linked to acidosis from high-concentrate diets.

Key Facts

Liver abscesses affect 12-30% of feedlot cattle at slaughter in some studies
They are caused by the bacterium Fusobacterium necrophorum entering the portal blood from the rumen
Subacute ruminal acidosis (SARA) from rapid diet transition to high-grain rations is the primary risk factor
Affected animals show reduced feed intake and growth, and severe cases cause systemic illness
Prophylactic antibiotics such as tylosin have been used to reduce prevalence but raise antimicrobial resistance concerns

Welfare Considerations

Liver abscesses represent a chronic welfare problem in feedlot systems because they develop subclinically - affected cattle show few obvious signs until the condition is severe or discovered at slaughter. The underlying cause, SARA from high-grain diets, causes significant rumen discomfort and predisposes animals to further metabolic and health problems. Dietary management during transition, ensuring adequate roughage, and monitoring for SARA are key welfare interventions. Reducing antibiotic reliance requires alternative management approaches including slower diet transitions and improved feed formulation.

What You Can Do

Support feedlot producers implementing gradual diet transitions and roughage provision
Advocate for post-mortem liver data to be used as a welfare indicator in cattle production
Encourage research into non-antibiotic approaches to liver abscess prevention
Choose beef from producers with transparent health monitoring and antibiotic stewardship programmes