EPEF in Poultry: European Poultry Efficiency Factor Explained
Complete guide to calculating, interpreting, and maximizing the EPEF performance index for commercial broiler flocks.
Scientific Overview
EPEF (European Poultry Efficiency Factor) is the gold standard performance index used to evaluate the overall economic efficiency of a commercial broiler flock. Unlike FCR or growth rate alone, EPEF integrates livability, growth, feed conversion, and slaughter age into a single composite score, allowing fair comparison between flocks with different market weights or production lengths.
EPEF Meaning and Formula
EPEF stands for European Poultry Efficiency Factor. It is the industry-standard composite index for assessing broiler flock performance, combining livability, average body weight, FCR, and days to slaughter into a single number.
Example: Livability 97%, ABW 2.5 kg, FCR 1.60, Age 38 days → EPEF = (97 × 2.5 × 100) ÷ (1.60 × 38) = 399. Use our EPEF Calculator for instant results.
What Is a Good EPEF Score?
EPEF benchmarks for commercial broiler production:
| Performance Level | EPEF Score | Interpretation |
|---|---|---|
| World-class | > 450 | Top-performing integrations globally |
| Excellent | 380–450 | Strong commercial management |
| Average | 300–380 | Typical commercial farms |
| Below average | < 300 | Significant room for improvement |
How to Improve Your EPEF Score
Every component of the EPEF formula is a lever you can pull:
- Raise Livability%: Reduce mortality through disease prevention (Disease Atlas) and vaccination programs.
- Increase Average Body Weight: Optimize brooding, lighting, and feed program phases. Track weekly weights against breed targets.
- Lower FCR: Improve feed quality, reduce wastage, and control gut health. Every 0.05-point FCR reduction adds approximately 3–5 EPEF points.
- Reduce Slaughter Age: Better brooding and nutrition means birds reach target weight sooner, boosting the EPEF divisor.
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.