Missing processor weight targets by just 5% costs a 20,000-bird operation around $7,600 per flock. Yet most farmers rely on weekly sampling of less than 1% of their birds, essentially making harvest decisions based on guesswork.
Tracking broiler weight accurately is not just about hitting growth charts. It is about catching problems early, optimizing feed conversion, and making sure your birds hit slaughter weight when the contract says they should. The difference between "close enough" and "right on target" is the difference between profit and loss.
In this article, we will walk through the Cornish Cross weight chart, explain what the numbers really mean for your operation,and make sure your flock is on the right path toward reaching the average broiler chicken weight on schedule.
Broiler Chicken Weight Chart Per Day
The table below provides a typical growth schedule for a broiler chicken during its first 30 days. This period is critical, as the birds experience their most rapid growth and are highly efficient at converting feed into body mass. Farmers can use the chart to monitor performance at key checkpoints:
- End of Week 1 (Day 7): Chicks should reach about 0.46 lb (0.21 kg). If chicks miss this target, your brooding setup needs immediate attention—temperature, lighting, or feeder access. Catching this early prevents compounding losses through the entire grow-out.
- End of Week 2 (Day 14): Birds should weigh close to 1.09 lb (0.49 kg). Falling short here? Look at feed quality first—dusty or poorly mixed feed shows up in Week 2 performance. Water access and crowding are also common culprits.
- End of Week 3 (Day 21): Expected body weight is around 2.23 lb (1.01 kg). Feed consumption rises rapidly now. Maintaining clean feeders and steady ventilation helps keep feed conversion efficient. This is where small management issues become visible in weight data.
- End of Week 4 (Day 28): Birds should reach about 3.77 lb (1.71 kg). This is a key checkpoint for early FCR evaluation. You can assess if growth is tracking profitably before the finishing phase. If birds are behind, adjusting feed now still makes a difference.
Broiler Chicken Weight Chart: After One Month
Once broilers pass the 4-week mark, growth continues but feed conversion ratio (FCR) starts to climb. Understanding what happens in Weeks 5-7 helps you decide when to harvest.
Data Reference: Aviagen
- Week 5 (Day 35): 5.25 lb (2.38 kg) — Birds are entering the finishing phase. Feed intake is high, and any environmental stress (heat, poor ventilation) directly impacts weight gain.
- Week 6 (Day 42): 6.41 lb (2.91 kg) — Most contracts target this range. If birds are tracking below target, extending grow-out by 2-3 days might help, but watch your FCR. Extra days cost money in feed.
- Week 7 (Day 49): 7.59 lb (3.44 kg) — FCR is now around 1.5, meaning birds need 1.5 pounds of feed to gain 1 pound. At this point, every extra day is expensive. Harvest timing decisions matter.
Why FCR Matters
The Feed Conversion Ratio (FCR) is the definitive metric for profitability, calculated as the total pounds of feed consumed divided by the body weight gained. Since feed accounts for 60–70% of production costs, FCR tells you exactly how efficiently your birds convert that expensive input into sellable meat.
Efficiency is highest in the early weeks, with FCRs of 1.0 to 1.2. However, this ratio rises significantly as growth slows. By Week 7, FCR hits about 1.5. This trend highlights why harvest timing is crucial: every extra day your birds stay in the barn costs you in feed that converts less efficiently.
For farmers and integrators, the goal is always the lowest possible FCR at each stage, as this ensures maximum efficiency and directly protects profits.
How to Feed Broiler Chicken: Best Practices
Feed quality and access directly affect whether birds hit their growth targets. Here is what matters most:
Feeding by Growth Phase
Broilers need different nutrition at different stages.
The following chicken feeding guide example uses the Aviagen Arbor Acres Broiler Nutrition Specifications (2022), designed for birds raised to around 4.4 lb (2.0 kg) market weight.
- Starter Phase (Day 1–10): In the first 10 days, chicks grow rapidly and need a nutrient-dense diet. Use a starter feed containing about 23% crude protein and 1,350 kcal/lb (2,975 kcal/kg) of metabolizable energy. This high-protein feed builds muscle, supports organ growth, and strengthens immunity. Early feeding, right after hatching, encourages healthy gut development and better lifetime performance.
- Grower Phase (Day 11–24): As birds enter the grower phase, they shift from rapid tissue development to muscle expansion. Provide a grower feed with about 21.5% crude protein and 1,385 kcal/lb (3,050 kcal/kg) of metabolizable energy. This balance supports strong muscle growth and efficient feed conversion.
- Finisher Phase (Day 25–42): The last phase focuses on efficient weight gain and carcass quality. Feed a finisher diet with about 19.5% crude protein and 1,410 kcal/lb (3,100 kcal/kg) of metabolizable energy. Energy density rises slightly to support maximum growth, while protein levels taper down as birds deposit more fat and less lean tissue. A good finisher promotes desirable body weight, clean fat cover, and a firm meat texture.
Always purchase feed from reputable manufacturers, as cheap or low-quality feed can reduce growth and overall flock performance. Pelleted feed is generally preferred because it reduces wastage, improves FCR, and ensures birds consume a balanced diet. Mash feed can lead to selective eating, which may result in uneven growth and nutrient deficiencies.
Feeder Setup
Feed access matters as much as feed quality. Overcrowding at feeders means some birds eat less, creating uneven growth across the flock.
· Chick feeders: 1 per 50 chicks for first week
· Tube feeders: 1 per 40-50 birds (16 kg capacity)
· Linear trough: 2 inches (5 cm) per bird
Adjust feeder height weekly to match bird back height. Too low causes waste, too high reduces intake.
Nutrition Fine-tuning
Fine-tuning feed composition often makes the biggest difference in growth. Amino acids like lysine and methionine are key drivers of muscle development, and their balance matters. For example, research suggests keeping the isoleucine-to-lysine ratio at about 65% for good results in lower-protein diets.
Enzymes also improve feed efficiency. Phytase boosts nutrient absorption, lowering feed cost, while enzymes like xylanase or β-glucanase help break down specific grains for better digestion. Many farms today are also adopting all-plant protein programs, which reduce gut stress and help keep litter drier when properly formulated.
Water Quality
Birds drink 2-3 pounds of water per pound of feed. Water drives feed intake, so quality and access are non-negotiable.
Water quality targets:
· pH: 5.5-6.5
· Iron: below 0.2 ppm
· Coliforms: non-detectable
Flush water lines between flocks and test monthly. Poor water quality drops feed consumption immediately, and you will see it in weight data within days.
Moreover, appropriate equipment includes chick fonts (1 per 50–75 chicks), 16-liter drinkers (1 per 50–60 birds), automatic bell drinkers (1 per 75–100 birds), or nipple drinkers (1 per 12 birds). Always adjust the drinker height to align with the birds’ backs. Too low or too high can reduce intake.
Why are My Broilers Underweight?
Underweight birds cost money, but the cause is not always obvious. Here are the most common problems:
· Disease: Coccidiosis damages gut lining, preventing nutrient absorption even when birds eat normally. Respiratory infections and parasites steal nutrients. Weight loss often shows up 2-3 days before visible symptoms.
· Environmental stress: Too hot? Birds eat less and pant instead of growing. Too cold? They burn energy staying warm instead of gaining weight. Both situations waste feed and reduce FCR.
· Feed issues: Dusty, poorly mixed, or stale feed means some birds do not get enough protein or energy. Store feed properly, check for mold, and mix supplements thoroughly.
· Parasites: Internal worms steal nutrients. External pests stress birds. Both lead to poor feed conversion and slow growth.
Most underweight problems come down to management. For deeper coverage of health monitoring, biosecurity, and problem prevention, see our complete guide on broiler management to learn how to run your broiler farm more effectively.
How to Record the Broiler Growth Chart: Common Methods
There are two main ways farmers record broiler growth: manual sampling and automatic weighing systems.
Manual Sampling
Catch 20-50 birds, weigh them, record the data, release them. It works, but you are making decisions based on less than 1% of your flock.
What this means in practice:
· Sampling bias: You catch the slow birds, not the healthy ones avoiding you.
· Stress impact: Handling affects weight and health, skewing results.
· Time commitment: Labor-intensive. Weekly snapshots at best.
· Limited data: Gaps between weighings mean problems develop unseen.
Automatic Weighing Systems
Automated systems use sensors and scales to track weights continuously without handling birds.
What you gain:
· Continuous tracking: Real-time data, no handling required.
· Full flock coverage: See everyone, not just the accessible few.
· Early detection: Sick birds lose weight before symptoms show. Catch problems 48-72 hours earlier.
· Labor savings: No more catching birds, no manual recording.
Manual sampling works for smaller operations or when equipment investment does not make sense. Automated systems fit larger operations or those with tight processor windows where precision matters.
Benefits of Having Precise Weight for Broilers
Accurate weight tracking affects both profitability and flock health:
· Hit processor targets: Reduce out-of-window penalties. Improve contract compliance.
· Optimize feed conversion: Adjust rations based on actual growth. Stop wasting feed on birds already at target.
· Catch problems early: Weight anomalies show up before visible symptoms. Act while problems are still treatable.
· Improve harvest timing: Know exactly when birds hit target weight. No more guessing based on limited samples.
Ultimately, reliable weight data supports healthier, more uniform flocks and is the most powerful tool for growers and integrators to maximize operational efficiency and protect their bottom line.
iCHASE Offers You the Smart Broiler Chicken Weighing Scale System
The growth charts give you the targets. Manual sampling gives you snapshots. But if you are running a larger operation or need to hit tight processor windows, snapshots are not enough.
That is where precision monitoring makes sense. InsightScale uses AI-powered imaging to track weights continuously—no handling, no stress, complete flock coverage. Instead of weighing 50 birds weekly, you see everyone, every day.
That's exactly what InsightScale by iCHASE delivers: the smart broiler AI weighing system that becomes your farm's automatic growth coach. Using AI-powered imaging, it tracks bird weights continuously and delivers real-time data. This system instantly alerts you to performance dips, giving you the power to fine-tune feed and management protocols before problems spread and costs compound. End the guesswork and wasted feed; embrace precision farming at your fingertips.
Contact us today to know more about our innovative weighing solutions!