Key points
- WOAH Chapter 7.5 recommends several animal-based measures, checked after stunning and before and during bleeding.
- If stunning is ineffective or consciousness returns, WOAH calls for immediate re-stunning with a backup method.
- The operating brief should link restraint, trained observers, equipment maintenance and incident records.
A functioning stunner is only one part of the process. Specify who observes the animal, when checks occur and what happens if the first stun fails.
Why the check belongs in line design
WOAH’s 2024 slaughter chapter identifies ineffective stunning and recovery before death as welfare risks. It recommends more than one animal-based indicator and checks at several stages, rather than assuming a machine cycle proves unconsciousness. The chapter recommends head restraint for bovines. This article translates those principles into planning questions; it does not prescribe a stunning technique or replace competent supervision.
Plan the observation point
On the line drawing, show where a trained person can safely view the animal immediately after stunning and before and during bleeding. Keep access, lighting and communication clear enough for an observed problem to stop normal progression. Agree the observations and thresholds with the competent authority and qualified welfare team for the species, method and jurisdiction.
Make backup action feasible
WOAH says ineffective stunning or a return to consciousness requires immediate re-stunning using a backup method, with the event recorded and cause corrected. The equipment brief should identify backup availability, trained responsibility and a route that avoids waiting for an animal to advance through the line. Maintenance and calibration belong to the same operating procedure.
Record outcomes, not just equipment status
A log can tie the animal or batch, time, method, observer, welfare signs, action and equipment check together. Review repeated findings before increasing throughput. The source was checked on 14 October 2026; actual methods, safety provisions and legal requirements must be confirmed locally. An illustration cannot validate performance.
Practical question
Does a completed machine cycle prove that a cow is unconscious?
No. Qualified staff must assess multiple animal-based indicators and take immediate corrective action if stunning is ineffective or consciousness returns.
Related equipment and planning resources
Sources and further reading
Sources checked: