Broiler Feed Intake Curves: Tracking Expected Consumption by Age

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-14

Key Takeaways

• Broiler feed intake follows a predictable, cumulative curve from day-old to market age, with daily intake being a sensitive early indicator of flock health and environmental conditions.
• Expected feed intake is influenced by breed genetics, sex (males consume more from ~day 14), diet form (pelleted increases intake), and environmental temperature (higher intake in cold, lower in heat).
• Deviations of 10% or more from expected daily intake for two consecutive days warrant immediate investigation into water availability, house temperature, ventilation, lighting, or feed quality.
• Sustained feed intake below 15-20% of expected levels for two consecutive days, or below 25% for any 24-hour period, indicates a serious issue, potentially disease, requiring veterinary consultation.
• High feed intake without proportional weight gain suggests feed wastage (e.g., feeder height/fill issues) or digestive inefficiency, often linked to subclinical gut health issues like coccidiosis or necrotic enteritis.
• Accurate tracking requires comparing actual daily and weekly feed consumption against breed-specific standard charts, ideally paired with weekly bird weight measurements to assess feed conversion ratio (FCR).

Raising broilers profitably depends on knowing how much feed your flock should eat at every stage of growth. Feed represents 60 to 70 percent of total broiler production costs, so even small deviations from expected intake can significantly impact your bottom line. This guide explains how to use broiler feed intake charts, track consumption by week, identify problems early, and adjust your feeding program to keep birds on target. It is written for commercial broiler producers, small flock owners, farm managers, and poultry students who want practical, field-tested methods for monitoring feed consumption.

At a Glance

• Broiler feed intake follows a predictable curve that rises steadily from day-old chicks to market age.
• A standard broiler feed intake chart shows cumulative feed consumed per bird by week, not daily amounts alone.
• Expected feed intake varies by breed, sex, diet form, environmental temperature, and health status.
• Track actual feed consumption daily and compare it to breed-specific standards at least twice per week.
• Feed intake below expected levels for 48 hours warrants investigation into water, temperature, ventilation, disease, or feed quality issues.
• Sudden increases in feed intake without corresponding weight gain may indicate feed wastage or digestive inefficiency.
• Keep detailed records of feed deliveries, feeder adjustments, bird weights, and mortality to build your own flock-specific intake curves.
• Contact a veterinarian or extension agent when intake deviations accompany other signs like lethargy, respiratory distress, or rising mortality.

Understanding Broiler Feed Intake Patterns

Broiler feed intake is not random. It follows a biological pattern driven by body weight, digestive capacity, and metabolic demand. Day-old chicks consume very little feed, often just 10 to 15 grams per bird per day. By the end of the first week, that amount roughly triples. From week two through market age, daily intake climbs steadily, sometimes increasing by 10 to 15 percent week over week.

The cumulative feed intake curve is the most useful tool for farm management. It tells you how much total feed a flock should have consumed by a given age. For example, a typical straight-run broiler flock at 42 days might be expected to consume around 4.2 to 4.6 kilograms of feed per bird, depending on genetics and management. At 28 days, the same flock might have consumed about 2.3 to 2.6 kilograms per bird.

Daily feed intake is the more sensitive indicator for day-to-day management. A drop in daily intake often appears 24 to 48 hours before other signs of disease or stress become visible. This makes daily feed consumption one of your earliest warning systems.

Several factors influence where your flock falls on the feed intake curve. Breed genetics play a major role. Fast-growing strains have higher feed intake expectations than slower-growing or dual-purpose breeds. Sex also matters. Males eat more than females from around day 14 onward, and the gap widens as birds approach market age. Diet form affects intake too. Pelleted feed increases consumption compared to mash because birds can eat pellets faster and waste less. Environmental temperature shifts feed intake as well. Birds eat more in cold weather to maintain body heat and less in hot weather to reduce metabolic heat production.

Why Feed Intake Standards Matter

Feed intake standards give you a target to manage against. Without a reference point, you cannot tell whether your flock is eating normally, eating too little, or wasting feed. Each of these situations requires a different response.

When intake falls below expected levels, the cause is often something you can correct quickly. Water lines may be blocked or under pressure. Feeder pans may be set too high for bird size. House temperature may be too hot or too cold. Ventilation may be poor, allowing carbon dioxide or ammonia to build up. Lighting programs may not be giving birds enough time to eat. Feed may be stale, moldy, or contaminated.

When intake rises above expected levels, the cause is frequently feed wastage. Birds may be flicking feed out of pans, or feeders may be adjusted too high, allowing birds to scratch and waste feed. High intake without matching weight gain can also indicate digestive problems, such as coccidiosis or poor gut health, where birds eat more but convert feed less efficiently.

Feed intake standards also help you plan feed purchases and deliveries. If you know your flock size and the expected cumulative intake by week, you can calculate how much feed to order and when. This prevents both shortages and excess inventory that can go stale.

The Standard Broiler Feed Intake Chart

Feed intake charts are available from primary breeders, feed companies, and university extension services. The values differ slightly by source because they reflect different genetics and management conditions. The table below shows a representative example for a typical fast-growing broiler strain under standard commercial conditions. Use it as a starting point, then adjust based on your specific breed, sex, and management program.

These figures assume ad libitum feeding, meaning feed is available at all times. They also assume standard environmental conditions with house temperature around 85 to 90 degrees Fahrenheit for day-old chicks, decreasing gradually to 65 to 70 degrees by week six.

Your specific chart should come from the breeder whose genetics you use. Primary breeders publish detailed performance objectives that include feed intake expectations for their strains. These are the most accurate references because they are based on thousands of birds under controlled conditions. Feed companies also provide intake guides for the diets they sell. Extension services publish regional charts that account for local climate and management practices.

How to Build a Broiler Feeding Schedule

A broiler feeding schedule is more than just a chart on the wall. It is an operational plan that tells you how much feed to provide, when to adjust feeders, and what to check at each stage. Follow these steps to build a schedule that works for your farm.

Start with your target market weight and age. If you sell birds at 42 days at an average weight of 2.6 kilograms, your feeding schedule will differ from a producer growing birds to 3.5 kilograms at 56 days. Your target determines the length of the grow-out period and the cumulative feed required.

Select your feed program. Most commercial broiler operations use a three-phase program: starter from day 1 to day 14, grower from day 15 to day 28, and finisher from day 29 to market. Some operations add a pre-starter for the first 7 days or a withdrawal feed for the final 5 to 7 days before processing. Each phase has different nutrient density, and intake expectations shift accordingly.

Calculate total feed needed for the flock. Multiply expected cumulative intake per bird at market age by the number of birds placed. Add 5 to 10 percent for wastage and mortality. For example, if you place 10,000 chicks and expect 4.5 kilograms cumulative intake per bird at 42 days, you need 45,000 kilograms of feed plus a buffer of 2,250 to 4,500 kilograms.

Set up feeder space according to bird age. Day-old chicks need access to feeder trays or paper feed covers in addition to the main feeder lines. Provide 2.5 to 5 centimeters of feeder space per chick in the first week. By week three, birds need 5 to 8 centimeters per bird. At market age, provide 8 to 10 centimeters per bird. If feeder space is inadequate, birds cannot eat enough to meet intake targets.

Adjust feeder height as birds grow. The lip of the feeder pan should be at the height of the bird's back. When feeders are too high, birds struggle to reach feed and intake drops. When feeders are too low, birds step in the feed, contaminate it, and waste it. Check feeder height daily and adjust as birds grow.

Fill feeders to the correct level. Fill pans to one-third to one-half full. Overfilling causes birds to flick feed out of the pan. Underfilling restricts access and may cause dominant birds to block smaller birds from eating. The goal is to maintain a consistent feed level so all birds can eat at any time.

Monitor feed delivery and consumption daily. Weigh feed as it is delivered to each house or track the number of bags or tons used. At the end of each day, calculate total feed consumed and divide by the number of live birds to get daily intake per bird. Compare this number to your expected curve.

Tracking Feed Consumption by Week

Weekly tracking gives you a clear picture of flock performance and helps you spot trends before they become problems. Here is a practical system for weekly monitoring.

Choose a consistent time of day for measurements. Weigh feed at the same time each day, preferably in the morning before the main feeding period begins. This reduces variability from daily feeding patterns.

Weigh feed inventory at the start and end of each week. Subtract the ending inventory from the starting inventory plus deliveries to get total feed used. Divide by the number of bird-days (average live birds multiplied by days in the period) to get average daily intake per bird.

Record bird weights at least weekly. Weigh a sample of 50 to 100 birds from different areas of the house. Use a scale accurate to at least 10 grams. Calculate average weight and compare to your breed standard. Feed intake data is most useful when paired with weight data because the two together tell you about feed conversion efficiency.

Calculate feed conversion ratio (FCR) weekly. Divide total feed consumed by total weight gain for the period. A typical FCR for a 42-day broiler might be 1.5 to 1.7, meaning 1.5 to 1.7 kilograms of feed per kilogram of weight gain. If FCR rises above your target, investigate both feed intake and weight gain.

Plot your data on a graph. Draw your expected intake curve from the breed standard, then plot your actual weekly intake points. A visual comparison makes deviations obvious. A flock that falls below the curve for two consecutive weeks needs attention.

Compare your actual curve to the breed standard and to your own historical flocks. Over time, you will develop a sense of what is normal for your specific farm. Your farm's curve may differ from the breed standard because of your housing, climate, or management style. That is acceptable as long as your birds are performing well and reaching target weights.

Common Causes of Low Feed Intake

When feed intake drops below expected levels, work through this checklist in order. Many causes are simple to fix once identified.

Water availability and quality come first. Birds will not eat if they cannot drink. Check water lines for blockages, pressure problems, and leaks. Check drinker height and adjust for bird size. Measure water consumption if possible. A rule of thumb is that broilers drink about 1.6 to 2.0 liters of water per kilogram of feed consumed. If water intake is low, feed intake will follow.

House temperature is the next most common cause. Chicks that are too cold huddle and reduce feed intake. Birds that are too hot pant and reduce feed intake to lower heat production. Check temperature at bird level, not just at human height. Use the birds' behavior as a guide. Chicks should be spread evenly through the house, not clustered under heat sources or panting near ventilation inlets.

Ventilation quality matters. High ammonia levels irritate the respiratory tract and reduce feed intake. High carbon dioxide levels indicate poor air exchange. Birds exposed to drafts or stale air eat less. Check air quality daily, especially in cold weather when producers tend to reduce ventilation to save heat.

Lighting program affects feeding behavior. Broilers eat during light periods. If the dark period is too long, total daily intake drops. Most programs provide 18 to 23 hours of light per day. During the dark period, birds rest and do not eat. If you extend darkness to reduce activity and improve FCR, make sure the light period is long enough for birds to consume their daily feed requirement.

Feed quality and palatability matter. Check feed for mold, off-odors, or contamination. Check that the feed delivered matches what you ordered. A change in ingredient sources or formulation can affect palatability. Feed that is too finely ground may be dusty and less appealing. Feed that is too coarsely ground may be difficult for young chicks to consume.

Disease is a serious cause of reduced intake. Many broiler diseases, including coccidiosis, necrotic enteritis, and respiratory infections, cause feed intake to drop. If you have ruled out environmental and management causes and intake remains low for more than 48 hours, contact a veterinarian.

Common Causes of High Feed Intake

High feed intake is not always a good sign. When birds eat more than expected but do not gain weight proportionally, you have a feed efficiency problem.

Feed wastage is the most common cause of apparent high intake. Birds waste feed by flicking it out of pans, scratching it onto the floor, or spilling it from overfilled feeders. Check the area under and around feeders for spilled feed. Adjust feeder height and fill level. Consider changing feeder type or pan design if wastage persists.

Digestive inefficiency causes birds to eat more while gaining less. Coccidiosis damages the intestinal lining and reduces nutrient absorption. Necrotic enteritis causes inflammation and malabsorption. Both conditions increase feed intake relative to weight gain because birds must eat more to extract the same nutrients. If FCR rises and intake is high, examine birds for signs of digestive disease.

Feed form affects intake efficiency. Pellets are consumed faster and with less waste than mash. However, if pellets are too hard or too large, birds may reject them. If pellets are too soft or crumbly, birds may waste the fines. Check pellet quality and adjust the mill or feeder settings as needed.

Diet nutrient density affects intake. Birds eat to meet their energy requirements. If the diet is lower in energy than expected, birds eat more feed to compensate. This is normal but should be planned. If you change feed formulations, recalculate expected intake based on the new energy content.

Environmental stress can increase feed intake in some cases. Cold stress causes birds to eat more to maintain body temperature. This is expected in winter months but should be accounted for in your intake expectations. If intake rises suddenly during mild weather, look for other causes.

Step-by-Step Guide to Using a Broiler Feed Intake Chart

Follow this procedure to integrate feed intake charts into your daily and weekly management routine.

Step one: Obtain the correct chart for your breed. Contact your chick supplier or primary breeder representative. Ask for the performance objectives document that includes daily and cumulative feed intake expectations. If you cannot get the breeder chart, use a chart from your feed company or extension service that matches your production system.

Step two: Adjust the chart for your specific flock. Note the sex of your birds. If you are raising males only, add 5 to 10 percent to the intake figures from week three onward. If raising females only, subtract 5 to 10 percent. Adjust for season. Add 3 to 5 percent in cold weather and subtract 3 to 5 percent in hot weather.

Step three: Post the chart in your feed room and office. Include the expected daily intake per bird, cumulative intake per bird, and total feed for your flock size. Make it easy for anyone managing the flock to see the targets.

Step four: Measure actual intake daily. Weigh feed before it goes into the house and weigh any feed removed. Record the numbers in a logbook or spreadsheet. Calculate daily intake per bird by dividing total feed consumed by the number of live birds.

Step five: Compare actual to expected at least twice per week. Circle any day where intake is more than 10 percent below or above the expected value. Investigate the cause immediately.

Step six: Calculate weekly averages. At the end of each week, calculate average daily intake per bird for the week and cumulative intake per bird. Compare to the chart. Record the numbers for future reference.

Step seven: Pair intake data with weight data. Weigh birds weekly and record average weight. Calculate FCR for the week. A flock that is below intake but on target weight may be more efficient than expected. A flock that is on intake but below weight has an efficiency problem.

Step eight: Adjust your management based on the data. If intake is consistently below target, check water, temperature, ventilation, and feeder adjustment. If intake is consistently above target, check for wastage and evaluate feed quality.

Step nine: Keep records across flocks. Build a history of intake curves for your farm. Compare current flocks to previous ones. Over time, you will identify patterns specific to your operation and be able to predict problems before they occur.

Monitoring and Recordkeeping Systems

Good recordkeeping is the foundation of effective feed management. You cannot manage what you do not measure. A simple, consistent recording system is more valuable than a complex one that you will not maintain.

Use a daily feed log. Record the date, flock age, feed delivered, feed remaining, feed consumed, number of birds, and calculated intake per bird. Also record house temperature, water consumption, mortality, and any unusual observations. One page per day or one row per day in a spreadsheet works well.

Use a weekly summary sheet. At the end of each week, transfer daily data to a summary sheet. Calculate weekly average intake per bird, cumulative intake, average weight, and FCR. Compare each figure to the breed standard. Note any deviations and actions taken.

Use a flock closeout report. At the end of each flock, compile the complete record. Include total feed consumed, total weight produced, FCR, mortality, and any problems encountered. This report becomes your benchmark for future flocks.

Digital tools can simplify recordkeeping. Spreadsheet templates are available from extension services and feed companies. Some producers use farm management software that integrates feed data with weight data and environmental sensors. Choose tools that match your technical comfort level and farm size.

Regardless of the system you use, consistency matters more than sophistication. Record at the same time each day. Use the same methods for weighing feed and birds. Keep records in a place where all farm staff can access them. Review records regularly and use them to make decisions.

Decision Thresholds for Intervention

Knowing when to act is as important as knowing what to do. Use these thresholds to guide your response to feed intake deviations.

A single day of intake below 10 percent of expected is not usually a cause for alarm. It may reflect a temporary disturbance such as a feed delivery delay or a brief environmental issue. Monitor closely and check again the next day.

Two consecutive days of intake below 10 percent of expected warrants investigation. Work through the checklist of water, temperature, ventilation, lighting, and feed quality. Make corrections as needed.

Two consecutive days of intake below 15 to 20 percent of expected is a serious concern. Contact a veterinarian or extension agent if you cannot identify and correct the cause quickly. This level of intake reduction often indicates disease or a significant management failure.

Intake below 25 percent of expected for any 24-hour period is an emergency. Birds can die from feed and water deprivation within a short time. Act immediately to identify the cause. Check water lines first, then feed delivery, then environmental conditions.

High intake thresholds work differently. A single day of intake above 10 percent of expected may indicate a feed delivery error or a weighing mistake. Check your records and verify the numbers. If intake is genuinely high, check for feed wastage.

Sustained intake above 15 percent of expected, especially with poor FCR, indicates an efficiency problem. Examine feeder adjustment, feed quality, and bird health. Consider consulting a nutritionist to review your feed program.

When to Call a Veterinarian or Extension Agent

You cannot solve every problem on your own. Know when to seek professional help.

Call a veterinarian immediately if feed intake drops sharply and is accompanied by other signs of disease. These signs include lethargy, drooping wings, ruffled feathers, respiratory distress, diarrhea, nervous signs, or sudden increases in mortality. Do not wait to see if the flock improves on its own. Early intervention can save a flock.

Call a veterinarian if you suspect a notifiable disease. In the United States, report suspected cases of highly pathogenic avian influenza and other reportable diseases to the USDA APHIS Veterinary Services or your state animal health official. Do not move birds, equipment, or manure off the farm until you have guidance.

Call an extension agent or poultry specialist if feed intake deviations persist despite your best corrective efforts. They can help you evaluate your feeding program, environmental conditions, and management practices. They can also connect you with diagnostic laboratories for feed and bird testing.

Call a nutritionist if you suspect feed quality or formulation problems. They can review your feed program, test feed samples, and recommend adjustments. Feed problems can be subtle. A nutritionist can identify issues that are not obvious from feed appearance or smell.

Call a service representative from your feed company or chick supplier if you have questions about the expected performance of your specific genetics or feed program. They have access to detailed performance data and can help you interpret your results.

Frequently Asked Questions

How accurate are broiler feed intake charts?

Broiler feed intake charts are accurate for the specific genetics and conditions they are based on. Breeder charts reflect performance under ideal conditions with optimal management. Your actual intake may differ by 5 to 15 percent depending on your housing, climate, feed program, and management quality. Use charts as a reference point, not an absolute standard. Your own historical records for your farm are the most accurate guide.

What should I do if my broilers are eating less than the chart says?

Work through the checklist of common causes in order. Check water availability and quality first. Then check house temperature, ventilation, lighting, and feeder adjustment. Check feed quality and delivery records. If you cannot find and fix the cause within 48 hours, contact a veterinarian or extension agent. A sustained drop in feed intake often signals a disease problem.

How much feed does a broiler eat per day by week?

A typical broiler eats about 13 to 22 grams per day in week one, 33 to 45 grams per day in week two, 60 to 78 grams per day in week three, 90 to 112 grams per day in week four, 120 to 145 grams per day in week five, and 150 to 175 grams per day in week six. These figures vary by breed, sex, and management. Use your breed-specific chart for exact numbers.

Why are my broilers eating more than expected but not gaining weight?

This pattern indicates poor feed efficiency. Check for feed wastage first. Look under and around feeders for spilled feed. Check feeder height and fill level. If wastage is not the problem, suspect digestive disease such as coccidiosis or necrotic enteritis. Poor gut health reduces nutrient absorption, so birds eat more to compensate. Contact a veterinarian for diagnosis and treatment.

How do I calculate feed intake per bird per day?

Weigh the total feed given to the flock in a 24-hour period. Subtract any feed left at the end of the period. Divide the net feed consumed by the number of live birds in the house. For example, if a house with 10,000 birds consumes 450 kilograms of feed in a day, daily intake per bird is 45 grams.

Can I use the same feed intake chart for all broiler breeds?

No. Different breeds and strains have different growth rates and feed intake patterns. Fast-growing strains eat more than slower-growing or dual-purpose breeds. Always use the chart from your specific breed supplier. If you switch breeds, obtain the new breed's performance objectives and adjust your feeding program accordingly.

How often should I weigh feed to track intake?

Weigh feed at least once daily. More frequent measurement, such as at each feed delivery or at each feeder fill, gives you more precise data but requires more labor. Daily weighing at a consistent time is sufficient for most operations. Weekly averaging smooths out daily fluctuations and gives you a clearer picture of trends.

What is a normal feed conversion ratio for broilers?

A typical FCR for a 42-day broiler is 1.5 to 1.7, meaning 1.5 to 1.7 kilograms of feed per kilogram of weight gain. Faster-growing strains and males tend to have lower FCR. Slower-growing strains and females tend to have higher FCR. FCR also varies with diet quality, environmental conditions, and health status. Compare your FCR to your breed standard and to your own historical performance.

Related Farming Guides

This section will be populated with links to related farming guides on poultry nutrition, broiler house management, and flock health monitoring. Check back for updated content or use the site search to find additional resources on broiler production.

Related Clinical & Scientific Guides

• Poultry Farm Fencing: Materials, Design, and Predator Exclusion
• Broiler House Wind Speed and Airflow Measurement
• Broiler House Heating Systems: Types and Efficiency

References

• FAO Poultry Production: https://www.fao.org/poultry-production-products/en/
• USDA APHIS Poultry Health: https://www.aphis.usda.gov/livestock-poultry-disease/avian
• WOAH Avian Influenza: https://www.woah.org/en/disease/avian-influenza/
• FAO Animal Production and Health: https://www.fao.org/animal-production/en/
• WOAH (World Organisation for Animal Health): https://www.woah.org/en/home/

This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.