2.2 Seasonal activity of movements
Time series were constructed with the sum of the monthly number of active premises, movements, and animals in the study period (36 months). The absence of serial correlations was then assessed using partial autocorrelation plots. A Mann-Kendall seasonal trend test (Pohlert, 2020) was applied to determine the statistical significance of the overall (full time series) and seasonal trends (months). Pettitt’s test (Pettitt, 1979) was performed to detect a single point of change in the time series.