Broiler Slaughter Target Weight & Age Curve Guide
A technical guide to commercial broiler slaughter age targets (35 vs 42 vs 49 days), carcass dressing percentages, and cut-up yields.
Scientific Overview
Technical guide to commercial broiler slaughter age targets (35 vs 42 vs 49 days), carcass dressing percentages, and cut-up yields. Learn optimal feed withdrawal protocols (8–12 hour window) to prevent crop tearing and evisceration contamination.
1. Broiler Slaughter Physiology & Commercial Dressing Percentage
Dressing Percentage Definition: In commercial poultry processing, dressing percentage (carcass yield) represents the proportion of eviscerated, ready-to-cook (RTC) meat carcass remaining after the removal of blood, feathers, head, shanks, and non-edible viscera:
Dressing Percentage (%) = [ Eviscerated Ready-to-Cook Carcass Weight (kg) / Live Pre-Slaughter Weight (kg) ] × 100
Modern fast-growing commercial broilers achieve dressing percentages between 71.5% and 75.0%. The dressing percentage increases predictably as birds grow heavier: a 1.8 kg broiler yields approximately 70.5%–71.5% carcass weight, whereas a 3.2 kg heavy roaster yields 74.5%–76.0% carcass weight.
2. Primal Cut-Up Yield Breakdown Table (From a 2.4 kg Broiler)
| Primal Cut / Carcass Part | Yield (% of RTC Carcass) | Typical Weight (from 2.4kg Live) | Commercial Profit Role |
|---|---|---|---|
| Whole Ready-to-Cook Carcass | 73.0% – 74.5% | 1,750 – 1,790 g | Retail whole bird benchmark |
| Boneless Breast Fillets + Tenders | 23.5% – 25.5% | 560 – 610 g | Highest value commercial margin |
| Thighs (Bone-In, Skin-On) | 14.5% – 16.0% | 350 – 385 g | Foodservice & dark meat export |
| Drumsticks | 13.0% – 14.5% | 310 – 350 g | Retail consumer favorite |
| Wings (3-Joint Whole) | 8.5% – 9.8% | 205 – 235 g | Restaurant & bar premium pricing |
| Carcass Frame / Back / Neck | 18.0% – 20.0% | 430 – 480 g | Mechanically Separated Meat (MSM) |
The 8-to-12-Hour Feed Withdrawal Rule:
Feed must be withdrawn from broilers exactly 8 to 12 hours prior to slaughter (including catching and transit time). If feed withdrawal is under 8 hours, the crop and intestines remain gorged with unabsorbed feed, leading to gastrointestinal rupture and fecal contamination during automated evisceration. If withdrawal exceeds 14 hours, the intestinal mucosa sloughs off, bile contaminates the liver, and live carcass weight shrinks by 0.3% to 0.5% per hour.
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.