How to use
- Enter the number of animals and their average weight at the start and end of the period.
- Enter the total feed eaten by the group and the price per kg or lb of feed.
- Enter the days on feed to get the daily gain.
How it works
- total gain = (end weight − start weight) × number of animals;
- FCR = total feed ÷ total gain; feed efficiency = total gain ÷ total feed;
- cost of gain = feed × price ÷ total gain;
- average daily gain = (end weight − start weight) ÷ days.
Example
100 pigs from 25 to 110 kg in 120 days, eating 25,500 kg of feed at 0.35 a kilogram:
- gain (110 − 25) × 100 = 8,500 kg;
- FCR 25,500 ÷ 8,500 = 3; efficiency 0.333;
- feed cost 25,500 × 0.35 = 8,925.00, or 1.05 per kg of gain;
- daily gain 85 ÷ 120 = 0.708 kg per pig.
Tips and common mistakes
- Weigh feed, not bags delivered: spilled and stale feed counts against FCR, but measure it if you want to know where it goes.
- Keep the same unit for weights and feed. Mixing kg and lb gives a meaningless ratio.
- FCR worsens as animals get heavier, so compare batches over the same weight range.