Broiler Slaughter Target Weight & Processing Yield Guide
Technical guide to commercial broiler harvest age curves (35 vs 42 vs 49 days), carcass dressing percentage, eviscerated yield, and breast meat yield.
Scientific Overview
Selecting the optimal broiler slaughter age and target live weight determines processing yield, carcass dressing percentage, and final flock profitability. Understanding the relationship between grow-out age, Feed Conversion Ratio (FCR), and meat cutup yields enables integration managers to align production with market demands.
Slaughter Target Age Benchmarks (35 vs 42 vs 49 Days)
Standard commercial harvest categories:
- Small Bird / Fast Food (33-36 Days): Target live weight 1.6 to 1.8 kg. Lowest cumulative feed per bird, used for whole bird sales and fast-food tenders.
- Standard Retail Carcass (40-42 Days): Target live weight 2.4 to 2.6 kg. Optimal balance between carcass dressing percentage (72-74%) and feed efficiency.
- Heavy De-boning Cutup (48-52 Days): Target live weight 3.2 to 3.6 kg. Maximizes total breast meat yield (>25% of live weight) for processed chicken products.
Carcass Dressing & Eviscerated Yield Calculation
Carcass Dressing Percentage is calculated as: (Eviscerated Carcass Weight / Live Harvest Weight) × 100. Standard commercial eviscerated yields range from 70% to 76%, depending on sex, age, and feed withdrawal timing before harvest.
Pre-Slaughter Feed Withdrawal (8-12 Hours)
Withholding feed for 8 to 12 hours prior to slaughter ensures the gut empties completely, minimizing intestinal rupture and fecal contamination during automated evisceration, while preserving clean drinking water access to prevent carcass dehydration.
All scientific data, diagnostic criteria, and performance benchmarks presented on this page are derived from published peer-reviewed journals and official veterinary codes:
- Avian Pathology & Diagnostics: World Organisation for Animal Health (WOAH, 2023). Manual of Diagnostic Tests and Vaccines for Terrestrial Animals. Paris, France.
- Poultry Diseases & Histology: Swayne, D.E., et al. (2020). Diseases of Poultry (14th ed.). Wiley-Blackwell / American Association of Avian Pathologists.
- Nutrition & Feed Chemistry: Leeson, S. & Summers, J.D. (2001). Commercial Poultry Nutrition (3rd ed.). University Books, Guelph, Ontario.
- Commercial Breed Standards: Aviagen (2024). Ross 308 & Cobb 500 Broiler Performance Objectives. / Lohmann Breeders (2024). Lohmann Brown Management Guide.