Stability: The Norwegian BSE/cattle system was assessed to be extremely unstable between 1980-1989 because of an existing potential of crosscontamination of MBM in feedstuffs and the rendering systems not fully in compliance with the EU requirements.
The system was neutrally stable during 1990 and 1994 due to the ban of ruminant derived feedstuffs from ruminant feed (RMBM ban) in 1990.
Since mid 1994, the system is considered stable because of the improved tracing capacity, the rendering system now operating according to the standard of the EU Directive, and the introduction of mandatory labelling of packaged feedstuffs. Absence of an SRM-ban prevents the system from being very stable or optimally stable.