Electroencephalograms and physical reflexes of broilers after electrical waterbath stunning using an alternating...

Area of Science:

• Animal Science
• Veterinary Medicine
• Food Science

Background:

• Electrical waterbath stunning is a common method for broiler processing.
• Assessing stunning effectiveness is crucial for animal welfare and meat quality.

Purpose of the Study:

• To evaluate the efficiency of electrical waterbath stunning in broilers using electroencephalograms (EEG) and physical reflexes.
• To determine optimal electrical parameters (current and frequency) for effective broiler stunning.

Main Methods:

• Four hundred eighty-nine broilers were subjected to electrical waterbath stunning with varying alternating current levels (60-150 mA) and frequencies (70-1,500 Hz) for 10 seconds.
• EEG was recorded for 120 seconds post-stun, analyzing brain activity suppression and epileptiform patterns.
• Physical reflexes, including spontaneous breathing, eye blinking, wing flapping, and corneal reflex, were monitored.

Main Results:

• Stunning frequencies above 400 Hz or below 100 mA failed to achieve profound brain activity suppression in over 90% of broilers.
• Specific combinations of frequency and current (e.g., 70-200 Hz with 100-150 mA) resulted in inadequate stunning, with over 80% of birds not recovering.
• Wing flapping, observed in at least 50% of broilers with adequate stunning, was linked to convulsions and potential meat defects.

Conclusions:

• Electrical stunning parameters significantly impact broiler brain activity and reflex responses.
• Frequencies above 400 Hz and currents below 100 mA are not recommended for effective broiler stunning.
• Careful selection of stunning current and frequency is necessary to ensure both effective stunning and minimize meat quality issues.