It is possible that procedures authorised under a project licence could result in below threshold severity. This occurs when a procedure was originally considered to cause above-threshold pain or suffering, but in retrospect this did not occur. This can include:
- breeding of genetically altered animals under project licence authority but without a harmful phenotype
- dosing with a compound in feed where the animals ate normally and suffered no consequences of being dosed
Most procedures are classified as sub-threshold, they account for over 40% of all procedures. See our statistics page for more detailed information.