Feed Conversion Ratio (FCR) & Growth Simulator
Calculate baseline FCR, cost per kg live weight gain, and model how PLF microclimate optimization (lowering ammonia & heat stress) improves feed efficiency.
Understanding Feed Conversion Ratio (FCR) in Commercial Livestock Operations
Feed Conversion Ratio (FCR) is the definitive benchmark of nutritional efficiency, animal health, and financial performance across modern broiler, swine, and dairy production. Feed represents between 65% and 75% of total operational costs in intensive livestock farming. Small variations in feed efficiency create substantial economic impacts—improving a flock's FCR by just 0.05 points can yield thousands of dollars in cycle savings.
1. Mathematical Definition of FCR
FCR is calculated as the total quantity of feed consumed (in kg or lbs) divided by the total live weight gained by the animal group during the measurement window:
2. Commercial Target Benchmarks by Livestock Species
- Commercial Broilers (Ross 308 / Cobb 500): 1.42 – 1.62 at 35–42 days harvest weight (2.0 – 2.8 kg).
- Commercial Turkeys (Heavy Toms): 2.30 – 2.65 at 18–20 weeks.
- Finishing Swine (Wean-to-Finish): 2.50 – 2.85 from 7 kg to 115 kg market weight.
- Layer Pullets: Monitored as feed intake per dozen saleable eggs rather than body weight gain.
3. Environmental Drivers of FCR Degradation
Excessive atmospheric ammonia (>20 ppm) irritates ocular and respiratory mucosal membranes, triggering subclinical inflammatory responses that divert dietary amino acids away from muscle protein accretion toward immune defense. Furthermore, elevated Temperature-Humidity Index (THI) values induce panting, raising maintenance energy demands while suppressing voluntary feed intake.