Liver abscesses caused by Fusobacterium necrophorum affect up to 30% of feedlot cattle and represent a significant welfare problem from subclinical pain that impairs daily function throughout the finishing period.
Liver abscess welfare in feedlot cattle represents a largely invisible suffering burden: the abscesses develop gradually, are not detectable on farm without slaughter surveillance, and cause progressive discomfort that manifests as reduced appetite and activity without obvious clinical signs that prompt treatment. The welfare cost of subclinical hepatic pain and the systemic effects of chronic bacterial infection is real but diffuse — spread across individual days of reduced wellbeing rather than concentrated in acute disease events. The antibiotic solution (sub-therapeutic tylosin) creates a welfare-antibiotic resistance trade-off: it reduces welfare harm from abscesses while contributing to resistance that threatens future welfare through compromised treatment options. The dietary solution — reducing the aggressive grain-based diets that cause rumen acidosis — is more welfare-aligned but conflicts with the economic model of rapid feedlot weight gain. Higher-welfare finishing systems with more roughage and slower growth rates have lower abscess prevalence and better welfare outcomes on multiple measures.