Large amounts of data from meat inspections can be used as a tool to support interventions for improvement of herd health. We applied time-series analyses on 3.5 years of meat inspection data of two pig slaughterhouses to identify differences in health aberration patterns over time at farm-level. A negligibly evidence of seasonality and a substantial trend pattern in percentage aberrations over time were identified. Differences exist in percentage health aberrations between the farms and months. This distinction is more elaborate than just grouping farms on basis of aberration incidence.