Broiler Feed Conversion Ratio: What's Good, What's Bad, and How to Improve It

Feed Conversion Ratio (FCR) is the single most important metric in broiler production. It tells you how many kilograms of feed it takes to produce 1 kilogram of live chicken. A farmer with FCR 1.7 makes about 30% more profit per bird than a farmer with FCR 2.2 — same breed, same feed, same market price. The difference is entirely in management [1][2].

Yet most smallholder farmers don't know their FCR. They buy feed by the bag, sell chickens by the bird, and never calculate whether they're profitable. This article fixes that — gives you the benchmark, the math, and 8 specific levers you can pull to improve your FCR by 0.1 to 0.3 points (worth 200-600 FCFA per bird).

The benchmark: what's good, what's bad

The benchmark assumes a modern broiler breed (Cobb 500, Ross 308, Arbor Acres) raised to 2.5 kg live weight in 42 days on quality commercial feed. Local breeds or longer cycles will have higher FCR (lower performance) by design — that's not a failure, it's a different production model [1].

The math: how to calculate FCR

The formula is simple:

FCR = Total feed consumed (kg) ÷ Total weight gain (kg)

Example: You buy 500 day-old chicks. At harvest, you have 475 birds (25 died). The average live weight at harvest is 2.4 kg. You fed a total of 2,000 kg of feed.

FCR = 2,000 ÷ (475 × 2.4) = 2,000 ÷ 1,140 = 1.75

That's a good FCR — well-managed smallholder level. Profit calculation: if feed cost 350 FCFA/kg, total feed cost = 700,000 FCFA. If you sell 475 birds at 3,500 FCFA each = 1,662,500 FCFA revenue. Gross margin (excluding chick cost, vaccines, etc.) = 962,500 FCFA, or about 2,025 FCFA per bird sold.

The 8 levers to improve FCR

1. Buy quality feed (impact: 0.1-0.3 FCR points)

Cheap feed is the most expensive thing you can buy. A 5,000 FCFA discount per bag translates to 25,000 FCFA saved on a 5-bag batch — but if the feed is stale, moldy, or under-formulated, you lose 0.2 FCR points = 600 FCFA per bird = 285,000 FCFA lost on a 500-bird batch. Always buy from a reputable supplier. Store feed in dry, sealed containers. Never feed moldy feed — aflatoxins reduce FCR by 10-20% and are toxic to humans too [3].

2. Use the right feed phase (impact: 0.1-0.2 FCR points)

Broiler feed comes in 3 phases:

• Starter (Day 1-10): 23% protein. Costs more per kg but the chicks need it for early growth.
• Grower (Day 11-28): 21% protein. Cheaper, still supports fast growth.
• Finisher (Day 29-42): 19% protein. Cheapest, used for the last 2 weeks.

Farmers who feed grower for the whole cycle lose 0.1-0.2 FCR points because starter phase growth is stunted and never recovered. Farmers who feed starter for the whole cycle waste money — the birds don't need that much protein after day 10. Switch phases on schedule.

3. Manage temperature (impact: 0.1-0.15 FCR points)

When birds are cold, they eat more feed just to maintain body temperature — that's "wasted" feed that doesn't translate to growth. When birds are hot, they eat less and grow slower. The ideal temperature by age:

• Week 1: 32-35°C
• Week 2: 29-32°C
• Week 3: 26-29°C
• Week 4+: 21-26°C

Below 18°C, FCR worsens by 0.01 points per degree. Above 28°C, feed intake drops by 1-2% per degree [1][3].

4. Provide clean water at all times (impact: 0.05-0.1 FCR points)

Broilers drink 2-3 times more water than they eat feed (by weight). If water is unavailable for 2 hours, feed consumption drops 20% for the next 24 hours — and growth never catches up. If water is contaminated, birds drink less and digest feed less efficiently. The rule: waterers should never be empty, and the water should be chlorinated (2-3 ppm free chlorine) [3].

5. Reduce mortality (impact: 0.1-0.2 FCR points)

This is counter-intuitive but true: high mortality worsens FCR. Why? Because the dead birds consumed feed before they died — that feed is in your "total feed consumed" numerator but the bird's weight is not in your "total weight gain" denominator. A batch with 10% mortality has roughly 0.1 worse FCR than a batch with 3% mortality, even if the surviving birds grew identically.

Focus on the first 7 days (highest mortality risk) — proper brooding temperature, electrolyte water, and quick removal of dead birds to prevent cannibalism.

6. Control coccidiosis (impact: 0.15-0.3 FCR points)

Subclinical coccidiosis (birds infected but not visibly sick) reduces FCR by 0.15-0.3 points. Birds eat normally but absorb less — the parasite damages the gut lining. Prevention: dry litter (coccidia thrive in wet litter), anticoccidial drugs in starter feed (Diclazuril, Monensin), and rotate the drug class every 3 batches to prevent resistance [2].

7. Maintain feeders and waterers (impact: 0.05 FCR points)

Adjust feeder height weekly — the lip should be at bird back height. Too low: birds scratch feed out (waste). Too high: birds can't reach the feed. Also: clean feeders daily to prevent stale/spoiled feed. Stale feed reduces palatability and the birds waste more than they eat.

8. Harvest at the right weight (impact: 0.1-0.2 FCR points)

FCR worsens with age — birds become less efficient converters as they grow. A bird at 2.0 kg might have FCR 1.7; the same bird at 3.0 kg might have FCR 2.0. The extra 1.0 kg of weight took 1.6 kg of feed instead of 1.4 kg. Know your market: if your buyer wants 2.0-2.5 kg birds, don't grow them to 3.0 kg — you're losing money on the extra feed. Sell at the target weight, not later.

How to track FCR with FarmWise

1. Log feed purchases in the Feed module. Each bag has a date, weight, and cost. The app tracks total feed used per batch.
2. Log daily mortality in the Daily Record for each batch. This gives you accurate bird counts at harvest.
3. Sample-weigh at day 7, 21, and harvest. Weigh 10 birds, divide by 10, multiply by currentCount. This gives you average live weight.
4. At sale, record the sale in FarmWise (Record Sale button on the batch detail page). The app auto-creates an income transaction in Finance and updates the batch's Profit Summary card.

The Profit Summary card on the batch detail page shows: purchase cost (chicks + initial feed), sales income (total from all sales), and net profit. As you record sales, the card updates — letting you see in real time whether this batch is profitable.

The quick FCR improvement checklist

• ✅ Buying feed from a reputable supplier (not the cheapest)
• ✅ Using starter (Day 1-10), grower (Day 11-28), finisher (Day 29-42) on schedule
• ✅ Temperature reduced 3°C per week from 32-35°C at week 1 to 21-24°C at week 6
• ✅ Waterers never empty, water chlorinated at 2-3 ppm
• ✅ First-week mortality under 2%
• ✅ Litter dry (squeeze test — should form a loose ball that crumbles)
• ✅ Feeder height at bird back, refilled 2x per day
• ✅ Selling at market target weight (2.0-2.5 kg for most Cameroonian markets)

If you hit all 8 of these, your FCR will be in the 1.7-1.9 range — top 25% of smallholder farms. Each lever you miss costs 0.05-0.3 FCR points, equivalent to 100-600 FCFA per bird.

Sources & References

• [1] Cobb-Vantress: Broiler Management Guide — FCR benchmark 1.6-1.9 for Cobb 500 at 2.5 kg, temperature curve, phase feeding. Source: cobb-vantress.com
• [2] Aviagen: Ross 308 Broiler Performance Objectives — FCR 1.7-2.0 standard, coccidiosis impact 0.15-0.3 points. Source: aviagen.com
• [3] Poultry World: Improving Broiler FCR — water quality reduces FCR 0.05-0.1, temperature outside range costs 0.01/degree. Source: poultryworld.net