Electrical stunning by direct brain stimulation in pigs.

Area of Science:

• Animal Science
• Veterinary Medicine
• Food Science

Background:

• Electrical stunning is a critical step in humane slaughter.
• Assessing the impact of brain electrode stunning on pig sensibility and meat quality is essential.
• Previous methods may have limitations in efficacy or meat quality outcomes.

Purpose of the Study:

• To evaluate the effectiveness of electrical stunning via brain-inserted electrodes in slaughter pigs.
• To determine the incidence of postmortem shoulder hemorrhages associated with this stunning method.
• To establish optimal voltage parameters for humane and effective stunning.

Main Methods:

• Electroencephalography (EEG) and electrocardiography (ECG) monitored 37 pigs during stunning with varying voltages (25V, 25V + relaxation current).
• Pigs were stunned using electrodes shot into the brain.
• Shoulder hemorrhages were assessed postmortem in experimental and practical condition groups (25, 50, 75V).

Main Results:

• Pigs showed no reaction to electrode insertion but exhibited epileptiform seizures post-stunning.
• Heart rate significantly increased, with observed arrhythmias.
• No hemorrhages were found in 27% of carcasses; others had minor hemorrhages.
• Practical conditions suggested ~87V (511mA) for effective stunning; lower voltages reduced hemorrhages.
• 25V was sufficient for direct brain contact, but ~90V is recommended for practical application.

Conclusions:

• Electrical stunning via brain electrodes is effective in inducing insensibility in slaughter pigs.
• The method results in a low incidence of shoulder hemorrhages.
• A recommended voltage of approximately 90V is advised for practical implementation to ensure both humane stunning and meat quality.