Fig 4. Significant flows of pigs between cantons in 2017.

Only flows of 5,000 or more pigs are shown and transports to slaughterhouses are excluded. The size of a node depends on the number of pigs arriving in this canton. St. Gallen (SG) is the largest arrival canton with 131,776 pigs being transported to St. Gallen during the course of 2017. The largest flow of pigs (45,403) occurred between Luzern (LU) and Aargau (AG). The abbreviations for cantons are given in S1 Table.