Mean percentage of closed holdings per holding type. Mean percentage of closed holdings (no animals moved on-farm in the last 12 months) per holding type in the Netherlands over the period from July 2002 to December 2004. The arrow represents the quarter in which movement restriction regulations were eased from 30 to 21 days.
Brouwer et al. BMC Veterinary Research 2012 8:188 doi:10.1186/1746-6148-8-188