Efficiency of bleeding of broilers after gaseous or electrical stunning

Area of Science:

• Animal Science
• Poultry Science
• Food Science

Background:

• Effective bleeding is crucial for broiler meat quality and safety.
• Stunning methods, including gas and electrical stunning, can impact bleeding efficiency.
• Understanding bleeding rates post-stunning is essential for optimizing poultry processing.

Purpose of the Study:

• To compare the bleeding efficiency of broilers stunned by different methods.
• To determine the optimal time interval between neck cutting and scalding following gas stunning.

Main Methods:

• Broilers were stunned using 45% carbon dioxide, 2% oxygen, or electrical stunning (77 or 104 mA).
• Bleeding efficiency was measured as grams of blood per kilogram of live weight.
• Bleeding rates were assessed at various time points post-neck cutting.

Main Results:

• Initial bleeding rate was higher in electrically stunned broilers with non-fibrillated hearts compared to gas-stunned broilers.
• This difference was significant up to 60 seconds post-neck cutting (P < 0.05).
• After 140 seconds, all groups exhibited similar bleeding out, reaching 30-33 g/kg live weight.

Conclusions:

• Electrical stunning with a non-fibrillated heart leads to a faster initial bleeding rate.
• For gas-stunned broilers, a time interval of 60 to 140 seconds between neck cutting and scalding is recommended.
• Optimizing stunning and post-stunning intervals ensures consistent bleeding efficiency in broiler processing.