Energy Needs of Broilers: Feeding for Rapid Growth and Efficiency

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

Key Takeaways

• Broiler diets require 2900 to 3200 kcal of metabolizable energy (ME) per kilogram, with energy density adjusted by bird age and environmental temperature to optimize growth and feed conversion.
• Energy sources primarily include cereal grains (corn, wheat) and added fats/oils, with fats being the most concentrated source; ingredient quality variability necessitates regular testing and formulation adjustments.
• Feed intake is regulated by energy density; higher energy diets lead to lower feed intake by weight, requiring careful balancing of protein and amino acids to prevent inefficient fat deposition or reduced growth.
• Environmental factors significantly impact energy needs: cold temperatures increase energy expenditure for thermoregulation, while heat stress reduces feed intake and necessitates diets with higher energy density and digestible fats.
• Feeding programs are phased (starter, grower, finisher) with escalating energy levels to match the broiler's changing requirements for muscle and fat deposition, and target market weight dictates the duration and intensity of each phase.
• Monitoring daily feed intake, weekly body weight, and calculating feed conversion ratio are critical for assessing the efficacy of the energy management program and identifying potential issues early.

Broiler production is a business built on converting feed into meat as quickly and efficiently as possible. The energy content of the diet is the primary driver of growth rate, feed intake, and carcass composition. This guide explains how metabolizable energy works in broiler nutrition, how to match energy levels to bird age and environment, and how to manage feeding programs for maximum efficiency. It is written for commercial broiler growers, small flock owners, farm managers, and students of poultry science who want a practical understanding of broiler energy requirements.

At a Glance

• Broilers need a high energy diet, typically 2900 to 3200 kcal of metabolizable energy per kilogram of feed, depending on age and target market weight.
• Energy comes mainly from corn, wheat, and added fats or oils. Fats are the most concentrated energy source.
• Feed intake is regulated by energy density. Birds eat to meet their energy needs, so higher energy feed means lower feed intake.
• Starter diets have slightly lower energy and higher protein. Grower and finisher diets increase energy to support rapid weight gain and fat deposition.
• Temperature matters. Cold birds eat more, hot birds eat less. Adjust feed formulation or feeding management to match the season.
• Feed form affects energy intake. Pellets and crumbles increase intake and reduce waste compared to mash.
• Monitor body weight, feed conversion ratio, and mortality daily. These numbers tell you if your energy program is working.
• Do not add energy without balancing protein and amino acids. An energy protein imbalance wastes money and produces excess fat.
• Call a poultry nutritionist or extension agent before making major formulation changes. Small errors in energy density can cost thousands of dollars over a flock cycle.

Understanding Broiler Energy Requirements

Energy is not a nutrient in the same way that protein or calcium are nutrients. It is the capacity to do work, and in animal nutrition it is measured in calories. Birds use energy to maintain body temperature, support organ function, move around, and grow new tissue. Any energy that is not used for these purposes is stored as fat.

The energy value of a feed ingredient is measured as metabolizable energy (ME), which is the gross energy of the feed minus the energy lost in feces, urine, and gaseous products. For poultry, nitrogen corrected metabolizable energy (MEn) is the standard measure reported on ingredient tables. This guide uses the term metabolizable energy to mean the usable energy in the diet.

Broiler energy requirements are expressed in kilocalories (kcal) of metabolizable energy per kilogram of feed, or sometimes per bird per day. A typical broiler diet contains between 2900 and 3200 kcal per kilogram. The exact level depends on the age of the bird, the target growth rate, the ingredient costs, and the environment.

Why Energy Is the Driving Force in Broiler Diets

Broilers are selected for rapid growth. A modern broiler strain can reach 2.2 kilograms (about 4.8 pounds) in 35 to 42 days. This rapid growth requires a constant supply of energy. Muscle tissue is about 20 percent protein and 75 percent water, but the metabolic processes that build that muscle require energy. Every gram of protein deposited in muscle requires about 5 to 7 kcal of metabolizable energy above maintenance.

Energy also determines how much feed a bird eats. Poultry have a digestive system that regulates intake based on energy density. When feed has more energy per kilogram, birds eat less feed by weight. When feed has less energy, birds eat more. This relationship is not perfect, and other factors such as heat stress, disease, and feed form can override it, but it is the basic rule of broiler feeding.

The practical result is that energy level is the main tool for controlling feed intake. If you want birds to eat more total energy, you raise the energy density of the diet. If you want to limit energy intake to slow growth, you lower energy density. Every feeding decision for broilers starts with this principle.

Components of Energy Requirement

A broiler's daily energy need is the sum of several parts:

Maintenance energy is the energy needed to keep the bird alive and at a constant body temperature. This includes the work of the heart, lungs, liver, and digestive system. Maintenance needs are roughly proportional to metabolic body weight, which is body weight raised to the 0.75 power. Larger birds need more maintenance energy per day, but smaller birds need more per kilogram of body weight.

Activity energy is the energy used for movement. Birds on litter that must walk to feeders and drinkers use more energy than birds in cages with feed and water close by. This is usually a small part of the total, perhaps 5 to 10 percent, but it matters in high density housing.

Growth energy is the energy deposited in new tissue. This includes both muscle and fat. Protein deposition is relatively efficient, with about 5 to 7 kcal needed per gram of protein deposited. Fat deposition is even more efficient, requiring about 3 to 4 kcal per gram. However, fat is energy dense, so a bird depositing a lot of fat is using a lot of total energy.

Thermoregulation energy is the energy used to maintain body temperature. Broilers are most comfortable in the thermoneutral zone, which is roughly 21 to 26 degrees Celsius (70 to 79 degrees Fahrenheit) for adult birds. Below this zone, birds burn energy to stay warm. Above it, birds reduce feed intake and may pant, wasting energy. The thermoneutral zone narrows as birds grow and produce more body heat.

Energy Levels by Production Phase

Broiler feeding programs typically use three or four diets: starter, grower, finisher, and sometimes withdrawal. Each phase has a specific energy recommendation.

Starter diets are fed from day 1 to about day 10 or 14. These diets usually contain 2950 to 3050 kcal per kilogram. The energy level is moderate because chicks have a limited digestive capacity and need a higher protein concentration to support early muscle development. Starter diets also contain higher levels of vitamins and minerals to support immune development.

Grower diets are fed from about day 14 to day 28. Energy increases to 3050 to 3150 kcal per kilogram. Protein levels drop slightly, but amino acid levels remain high enough to support the rapid muscle growth that happens during this period. This is often the phase with the most efficient feed conversion.

Finisher diets are fed from about day 28 to market age. Energy levels reach 3150 to 3250 kcal per kilogram. Protein levels drop further, and the diet is designed to promote fat deposition and finish. Some programs add a withdrawal diet in the last 5 to 7 days that is lower in energy and contains no medications.

These numbers are starting points, not fixed targets. A nutritionist will adjust them based on the specific broiler strain, the local ingredient prices, and the target market weight. A program aiming for a 2.5 kilogram bird at 42 days will use different energy levels than a program aiming for a 1.8 kilogram bird at 35 days.

Energy Sources in Broiler Feed

The energy in broiler feed comes from three main categories: cereal grains, fats and oils, and byproducts. Each source has different characteristics that affect feed formulation, pellet quality, and bird performance.

Cereal Grains

Corn is the standard energy source in broiler diets worldwide. It contains about 3350 kcal of metabolizable energy per kilogram on a dry matter basis. Corn is highly digestible, palatable, and produces good pellet quality. The protein content of corn is low at about 8 percent, so it contributes mostly energy to the diet.

Wheat is the second most common energy grain. It contains about 3080 kcal per kilogram, slightly less than corn. Wheat has more protein than corn at about 12 percent, but it also contains non starch polysaccharides that can increase digesta viscosity. Modern broiler diets often include enzymes such as xylanase to break down these polysaccharides and improve energy availability.

Barley, sorghum, and oats are used in some regions. Barley has lower energy at about 2600 to 2900 kcal per kilogram and requires enzyme supplementation. Sorghum has energy similar to corn but contains tannins that can reduce digestibility in some varieties. Oats are rarely used in broiler diets because of their high fiber content and low energy density.

Fats and Oils

Fats and oils are the most concentrated energy sources available. They contain about 7800 to 9000 kcal per kilogram, more than double the energy of corn. Adding fat to a broiler diet raises energy density without adding bulk, allowing birds to consume more energy in less feed.

Common fat sources include:

Vegetable oils such as soybean oil, canola oil, and palm oil. These are highly digestible and contain unsaturated fatty acids that are well absorbed by young chicks.

Animal fats such as poultry fat, beef tallow, and lard. These are less expensive than vegetable oils but contain more saturated fatty acids, which are slightly less digestible in young birds.

Blended fats and acidulated soap stocks from the food industry. These are economical but can vary in quality. Always test incoming fat for moisture, free fatty acids, and rancidity.

The digestibility of fat depends on the age of the bird. Young chicks digest unsaturated fats well but have limited ability to digest saturated fats. This is why starter diets often use vegetable oils, while finisher diets can include more animal fat. Adding a fat emulsifier or lecithin can improve fat digestibility in young birds.

Protein Meals as Energy Contributors

Soybean meal is the main protein source in broiler diets, but it also contributes energy. Full fat soybean meal contains about 3300 kcal per kilogram, while solvent extracted soybean meal contains about 2240 kcal. The difference is the oil content. Some formulators use full fat soybeans as a way to add both protein and energy.

Other protein meals such as canola meal, sunflower meal, and fish meal also contribute some energy. Their energy values are lower than grains because of higher fiber and ash content. When a nutritionist balances a diet, they account for the energy contributed by all ingredients, not just the grains and fats.

Ingredient Quality and Energy Variability

The book values for energy content are averages. Actual energy content varies with growing conditions, processing, and storage. Corn harvested in a wet year may have lower energy than corn harvested in a dry year. Fat that has been stored too long may be rancid and lower in energy.

This variability matters because it changes the actual energy density of the feed. A diet formulated to contain 3100 kcal per kilogram may actually deliver 3000 or 3200 depending on ingredient quality. The best way to manage this is to test ingredients regularly and adjust formulations accordingly.

Simple on farm tests can check moisture content of grains and free fatty acids in fats. More complete analysis requires a feed testing laboratory. If you are buying feed from a commercial mill, the mill should provide a nutrient specification sheet and may offer testing services.

Feed Form and Energy Intake

The physical form of the feed affects how much energy a bird consumes. Broilers can be fed mash, crumbles, or pellets. Each form has different effects on intake, waste, and energy availability.

Mash Feed

Mash is the simplest form, with all ingredients ground and mixed without further processing. Mash is the least expensive to produce but has several disadvantages. Birds can sort ingredients, picking out the palatable pieces and leaving the rest. This sorting leads to uneven nutrient intake within the flock. Mash also has higher feed wastage because birds flick it out of the feeder. The bulk density of mash is lower, so birds must eat more volume to get the same energy.

Pellets

Pelleting involves steam conditioning and pressing the mash through a die to form dense cylinders. Pelleting has several benefits for energy intake. The heat and moisture of the process gelatinizes starch, making it more digestible. Pellets are denser, so birds can consume more feed in less time. Pellets also prevent ingredient sorting and reduce waste.

The main downside of pellets is cost. Pelleting requires energy for the steam boiler and pellet mill, plus maintenance of the equipment. Pellet quality matters. If pellets are too hard, birds may not eat them. If pellets crumble into fines, birds waste them and the benefits are lost. Good pellet quality is usually defined as a high percentage of intact pellets with few fines. A common target is 80 to 90 percent pellet durability.

Crumbles

Crumbles are pellets that have been broken into smaller pieces. They are used for starter diets because young chicks cannot easily eat whole pellets. Crumbles provide the same benefits as pellets in terms of density and reduced sorting, but they are more expensive to produce because of the extra grinding step.

Feeding Management to Maximize Energy Intake

Feed form alone does not guarantee adequate energy intake. Feeder management is equally important. Feeders should be filled to the correct level. If feeders are too full, birds waste feed. If they are too empty, birds cannot access feed easily. The rule of thumb is to keep feed at about half to two thirds of the feeder depth.

Feed should be distributed evenly throughout the house so all birds have equal access. This prevents competition and ensures that smaller birds get enough energy. In the first week, place feed on paper or in extra feeder trays to help chicks find it. After day 3 or 4, gradually move chicks to the main feeder system.

Lighting programs also affect feed intake. Broilers are often given a period of darkness to reduce mortality and improve leg health, but darkness also reduces feed intake. The energy density of the diet may need to be increased if you use a lighting program with long dark periods.

Energy to Protein Balance

Energy level in the diet cannot be considered in isolation. The ratio of energy to protein, and more specifically to digestible amino acids, determines how the bird uses the energy.

The Importance of Amino Acid Balance

Protein is made up of amino acids. Birds do not have a protein requirement per se. They have requirements for specific amino acids, particularly lysine, methionine, and threonine. These are called limiting amino acids because they are the first ones to run out when the bird is building tissue.

When a diet has more energy than the bird can use for maintenance and activity, the excess energy is stored as fat. When a diet has more protein than the bird needs, the excess amino acids are deaminated. The nitrogen is excreted as uric acid, and the carbon skeleton is used for energy or converted to fat. Both scenarios are inefficient.

The ideal energy to protein ratio varies by age. Young chicks need a narrow ratio because they are growing muscle rapidly. Older birds need a wider ratio because they are depositing more fat. A typical starter diet has about 140 to 150 kcal of energy per percentage point of crude protein. A finisher diet has about 160 to 170 kcal per percentage point.

Consequences of Energy Protein Imbalance

Too much energy relative to protein causes excessive fat deposition. The bird may reach market weight, but a higher proportion of that weight will be fat. This reduces carcass yield and may cause processing plant downgrades. Excess fat also increases the cost of production because fat is expensive to deposit.

Too little energy relative to protein is also a problem. The bird will use amino acids for energy instead of muscle growth. This reduces growth rate and feed efficiency. In severe cases, it can cause leg problems and metabolic disorders because the bird is not getting enough energy to support its frame.

Adjusting Energy with Protein Levels

When you change the energy level of a diet, you must also change the protein and amino acid levels to maintain the correct ratio. This is why feed formulation is best left to a nutritionist. A simple rule for on farm adjustments is to maintain the energy to protein ratio within the recommended range for the bird age.

If you increase energy by adding fat, you must also increase the concentration of amino acids in the diet. This usually means adding more soybean meal or synthetic amino acids. If you do not, the bird will eat less feed because of the higher energy density, and its amino acid intake will drop below requirements.

Environmental Effects on Energy Needs

The environment in the broiler house has a major impact on energy requirements. Temperature is the most important factor, but humidity, air speed, and litter conditions also matter.

Temperature and Energy Use

Broilers are homeothermic, meaning they maintain a constant body temperature. When the environmental temperature drops below the thermoneutral zone, the bird must produce heat to stay warm. This heat comes from the metabolism of feed. The bird will eat more feed to get the energy it needs for both maintenance and growth.

The practical effect is that birds in cold weather eat more feed and have a worse feed conversion ratio. The extra feed is used for heat, not for growth. To manage this, some producers increase the energy density of the diet in winter. This allows birds to get the energy they need while eating less total feed.

In hot weather, the opposite happens. Birds reduce feed intake to lower heat production. This is because digesting and metabolizing feed generates heat. If a bird is already heat stressed, eating makes it hotter. Feed intake can drop by 10 to 15 percent in hot conditions, which directly reduces growth rate.

Heat Stress Management

Heat stress is one of the biggest challenges in broiler production. When environmental temperature exceeds about 30 degrees Celsius (86 degrees Fahrenheit), birds begin to pant. Panting removes carbon dioxide and water, which disrupts the acid base balance of the blood. This reduces feed intake and growth.

Several feeding strategies can help birds cope with heat stress:

Increase the energy density of the diet so birds get more energy per gram of feed consumed.

Use highly digestible fat sources, which produce less metabolic heat than carbohydrates or protein.

Reduce the crude protein level and supplement with synthetic amino acids. Protein digestion produces more heat than fat or carbohydrate digestion.

Feed during the cooler parts of the day. If you use a lighting program, schedule the main feeding periods for early morning and evening.

Provide cool, clean water at all times. Water intake increases in hot weather, and dehydration quickly reduces feed intake.

Humidity and Air Speed

High humidity reduces the bird's ability to cool itself by evaporative heat loss. Panting is less effective when the air is already saturated with moisture. This makes heat stress worse even at moderate temperatures.

Air speed helps remove heat from the bird. Tunnel ventilation systems create air speeds of 2 to 3 meters per second in hot weather. This convective cooling allows birds to tolerate higher temperatures. However, air speed also increases heat loss in cold weather, which raises energy requirements.

The combination of temperature and air speed is often expressed as the effective temperature or wind chill index. A bird at 25 degrees Celsius with 3 meters per second air speed feels cooler than a bird at 25 degrees Celsius with still air. Producers who use tunnel ventilation may need to adjust feed energy levels to account for this.

Litter and Housing Conditions

Wet litter increases heat loss because water conducts heat away from the bird. It also increases the risk of foot pad lesions and breast blisters, which reduce carcass quality. Good litter management keeps the litter dry and reduces the energy cost of thermoregulation.

Stocking density also affects energy needs. Birds in high density housing generate more heat collectively, which can raise house temperature. This is beneficial in cold weather but problematic in warm weather. Overcrowding also increases competition for feed and water, which can reduce energy intake for smaller birds.

Feeding Programs for Different Market Weights

The target market weight determines the feeding program. Broilers are marketed at a range of weights depending on the end product. A 1.5 to 2.0 kilogram bird is common in many markets for whole bird sales. A 2.5 to 3.5 kilogram bird is used for further processing and cut up parts. Heavy roasters can reach 4 to 5 kilograms.

Light Broilers

Light broilers are marketed at 1.5 to 2.0 kilograms, usually at 30 to 35 days of age. These birds need a high energy diet from the start to achieve rapid early growth. The feeding program is often shorter, with a starter diet fed for 10 days, a grower for 10 days, and a finisher for the final 10 to 15 days.

Energy levels for light broilers are typically at the higher end of the range, around 3050 to 3200 kcal per kilogram. The goal is maximum growth rate in a short period. Feed conversion is important, but the main cost driver is the number of days to market.

Medium Broilers

Medium broilers are marketed at 2.0 to 2.5 kilograms, usually at 38 to 45 days. This is the most common market weight in many regions. The feeding program uses a starter, grower, and finisher with energy levels of 3000 to 3150 kcal per kilogram.

The grower phase is longer for medium broilers, and the finisher phase is shorter. This allows for efficient muscle growth before fat deposition accelerates. Feed conversion is a major focus because the birds are on feed longer.

Heavy Broilers

Heavy broilers are marketed at 3.0 kilograms or more, usually at 50 to 60 days of age. These birds require a longer feeding program, often with four phases. Energy levels may be slightly lower in the early phases to prevent excessive fat deposition, then increased in the finisher phase to support the final growth spurt.

Heavy broilers are more prone to metabolic disorders such as ascites and sudden death syndrome. These conditions are linked to high energy intake and rapid growth. Some producers use a lower energy diet or a restricted feeding program for heavy broilers to reduce these risks.

Feeding to Target Growth Curves

The best way to manage energy intake is to feed to a target growth curve. Each broiler strain has a published growth curve that shows expected body weight at each age. Weigh a sample of birds weekly and compare to the target. If birds are below target, they are not getting enough energy. If they are above target, they may be getting too much.

Body weight alone is not enough. You also need to measure feed intake. Calculate feed conversion ratio as feed consumed divided by body weight gain. A high feed conversion ratio means the birds are eating too much for the growth they are achieving. This points to an energy problem, either too low energy density or an environmental issue.

Step by Step Guide to Managing Broiler Energy

This section provides a practical workflow for managing energy in a broiler flock. Follow these steps from chick placement to market.

Step 1: Start with a Balanced Diet

Purchase feed from a reputable mill or work with a nutritionist to formulate your own. The diet should be matched to the age of the birds and the target market weight. Do not try to save money by using a lower energy diet than recommended. The savings on feed cost will be lost to worse feed conversion and longer grow out time.

Step 2: Verify Feed Delivery

When feed is delivered, check the mill certificate or tag to confirm the nutrient content. The tag should show the guaranteed analysis, including minimum crude protein and fat. If possible, ask for the calculated metabolizable energy level. Take a feed sample and store it in a sealed bag in case of a problem later.

Step 3: Set Up Feeders for Chick Placement

Before chicks arrive, fill feeder trays or place feed on paper in the brooding area. Use a high quality starter crumble. The feed should be fresh and free of mold or off odors. Place feed close to the water source so chicks can find both easily.

Step 4: Monitor Feed Intake Daily

Record feed added to each house or pen daily. Compare actual intake to expected intake based on the broiler strain guide. A sudden drop in feed intake is often the first sign of disease, heat stress, or a feed quality problem. A sudden increase may indicate a feed formulation error or cold stress.

Step 5: Weigh Birds Weekly

Weigh a representative sample of birds each week. Use a scale accurate to at least 10 grams. Weigh at least 50 birds per house, or 5 percent of the flock, whichever is greater. Weigh at the same time of day each week, preferably in the morning before feeding. Calculate average body weight and compare to the strain target.

Step 6: Calculate Feed Conversion Ratio

Divide total feed consumed by total body weight gain. For example, if birds consumed 1000 kilograms of feed and gained 500 kilograms, the feed conversion ratio is 2.0. Track this number weekly. A good feed conversion ratio for a modern broiler is 1.5 to 1.8, depending on market weight and season.

Step 7: Adjust Feeding Management Before Adjusting Diet

If birds are not performing as expected, check the environment first. Is the temperature correct? Is litter dry? Is water flow adequate? Are feeders working properly? These factors affect feed intake more than small changes in diet energy. Only change the diet after ruling out environmental causes.

Step 8: Work with a Nutritionist on Formulation Changes

If you decide the diet needs adjustment, work with a professional. A nutritionist can reformulate the diet to maintain the correct energy to protein ratio. They can also help you evaluate ingredient prices and choose the most economical energy sources. Do not make large changes to energy levels on your own.

Step 9: Keep Records for Each Flock

Record the feed formula, feed intake, body weights, and environmental conditions for each flock. These records help you identify trends over time. They also provide valuable information when troubleshooting problems or planning future flocks.

Common Mistakes in Broiler Energy Management

Even experienced producers make mistakes with energy management. Here are the most common problems and how to avoid them.

Mistake 1: Using One Diet for the Entire Flock

Some producers feed the same diet from day 1 to market to simplify management. This is inefficient. A single diet cannot match the changing energy and protein needs of the bird. Early in life, the diet will be too high in energy and too low in protein. Late in life, it will be too low in energy and too high in protein. Multi phase feeding programs are more efficient and cost effective.

Mistake 2: Overlooking Feed Wastage

Feed wastage can be 5 to 10 percent of total feed, which directly reduces the energy available to birds. Check feeders regularly for leaks and damage. Adjust feeder height so the lip is at the level of the bird's back. Do not fill feeders more than half full. Use feeder pans with grills to prevent birds from scratching out feed.

Mistake 3: Ignoring Pellet Quality

Poor quality pellets crumble into fines, which birds waste. Check pellet quality at delivery and during storage. If you see more than 10 to 15 percent fines, the pellets may be too soft or may have been handled roughly. Talk to your feed mill about improving pellet quality. Store pellets in a dry place and do not handle them more than necessary.

Mistake 4: Adding Fat Without Adjusting Other Nutrients

Adding fat to a diet raises energy density and reduces feed intake. If you do not also raise the concentration of amino acids, the bird will consume less protein and grow more slowly. This mistake is common when producers try to boost energy in winter without reformulating the whole diet.

Mistake 5: Not Adjusting for Temperature

Feeding the same diet year round ignores the large differences in energy needs between summer and winter. In summer, birds eat less, so the diet should be more energy dense. In winter, birds eat more, so the diet can be less energy dense. Work with a nutritionist to develop seasonal feeding programs.

Mistake 6: Using Poor Quality Ingredients

Cheap ingredients are not always economical. Fat that is rancid has lower energy and may cause digestive problems. Corn with high moisture has lower energy per kilogram. Soybean meal that has been overheated during processing has lower amino acid digestibility. Test ingredients and buy from reputable suppliers.

Mistake 7: Neglecting Water

Water is the most important nutrient, but it is often overlooked. Birds drink about 1.8 to 2.0 kilograms of water for every kilogram of feed consumed. If water intake drops, feed intake drops within hours. Check water flow rates at the end of the line, clean drinkers regularly, and provide additional water sources during hot weather.

Mistake 8: Feeding to the Wrong Target

Some producers feed for maximum growth rate without considering the economics. Maximum growth is not the same as optimal growth. The cost of additional feed to push growth from 2.2 to 2.3 kilograms may exceed the value of the extra meat. Know your break even point and feed to the weight that maximizes profit, not just growth.

Monitoring and Recordkeeping

Good recordkeeping is essential for managing broiler energy. Without records, you cannot identify problems or measure improvement. This section outlines the key records to keep and how to use them.

Daily Records

Record the following every day:

Feed added to each house, in kilograms or pounds.

Mortality, including the number and cause of death if known.

House temperature, humidity, and ventilation settings.

Water consumption, if you have water meters.

Any unusual observations such as signs of disease, equipment failures, or feed quality issues.

Weekly Records

Record the following each week:

Average body weight from your sample weighing.

Feed conversion ratio for the week and cumulative for the flock.

Body weight uniformity, which is the coefficient of variation or the percentage of birds within a weight range.

Any changes to the feeding program or environment.

Flock Records

Record the following for each completed flock:

Total feed consumed and total feed cost.

Total body weight produced and revenue.

Feed conversion ratio for the whole flock.

Mortality percentage and causes.

Any problems encountered and how they were resolved.

Using Records to Make Decisions

Compare your records to the broiler strain guide and to your own historical averages. If a flock is performing below expectations, look for the cause. Check the environment, feed quality, and bird health. Use the records to identify whether the problem started at a specific age or under specific conditions.

Records also help you evaluate the economics of your feeding program. Calculate the cost per kilogram of live weight produced. This is the most meaningful measure of feed efficiency. It combines feed cost, feed conversion, and body weight into one number.

Health Monitoring

Energy problems often show up as health problems. Birds that are not getting enough energy may be weak, unthrifty, and more susceptible to disease. Birds that are getting too much energy may develop metabolic disorders.

Watch for these signs that indicate an energy problem:

Reduced feed intake that lasts more than 24 hours.

Poor growth rate compared to the strain target.

High feed conversion ratio.

Increased mortality, especially from sudden death syndrome or ascites.

Fatty liver syndrome, indicated by pale, enlarged livers at processing.

Excessive fat deposition, which may be visible at processing.

When to Call a Veterinarian or Extension Agent

Most energy management problems can be solved by adjusting feed formulation or environmental management. However, some situations require professional help. Call a veterinarian or extension agent in the following circumstances:

Sudden Drop in Feed Intake

If feed intake drops by more than 20 percent in a single day and does not recover within 24 hours, call a veterinarian. This could indicate a disease outbreak, a feed contamination problem, or a serious environmental failure. Do not wait to see if the birds recover on their own.

High or Rising Mortality

Mortality above 1 percent per week is a cause for concern. If mortality is rising and you cannot identify the cause, call a veterinarian. Sudden death syndrome and ascites are linked to energy metabolism and may require dietary changes. Infectious diseases can also cause mortality and require prompt diagnosis.

Poor Growth or Feed Conversion

If birds are consistently below the strain target by more than 5 percent, or if feed conversion is more than 10 percent worse than expected, call an extension agent. They can help you evaluate the feeding program, check ingredient quality, and identify management issues.

Feed Quality Concerns

If feed arrives with an unusual odor, color, or texture, stop using it and contact the feed mill. If you suspect contamination with mold, mycotoxins, or other toxins, call an extension agent. They can help you arrange for feed testing and advise on whether to discard the feed.

Unusual Lesions or Behaviors

If you see unusual lesions, lameness, or behavioral changes, call a veterinarian. These could indicate a nutritional deficiency, toxicity, or infectious disease. Take photos and preserve any dead birds for necropsy. A necropsy can provide valuable information about the cause of the problem.

Regulatory Concerns

If you suspect a notifiable disease such as highly pathogenic avian influenza, you must report it to the appropriate authorities. In the United States, contact the USDA APHIS Veterinary Services or your state animal health official. Do not move birds or equipment until you have received guidance.

Frequently Asked Questions

How much energy does a broiler need per day?

A broiler's daily energy need ranges from about 150 kcal at day 1 to about 700 kcal at market age. This varies with body weight, growth rate, and environmental temperature. The most practical approach is to feed a diet with the recommended energy density for the bird's age and let the bird regulate its intake. Most broiler diets contain 2950 to 3250 kcal of metabolizable energy per kilogram of feed.

What happens if broiler feed has too much energy?

If a broiler diet has too much energy relative to protein, birds will consume less feed to meet their energy needs. This reduces their intake of amino acids, vitamins, and minerals. Growth slows, and the bird deposits more fat. If the energy excess is severe, birds may develop fatty liver syndrome or other metabolic disorders. The solution is to balance energy with protein and amino acids.

What happens if broiler feed has too little energy?

If a broiler diet has too little energy, birds will eat more feed to try to meet their energy needs. This increases feed intake and can lead to wet litter and digestive problems. The extra feed may not provide enough amino acids for growth, so feed conversion worsens. Birds may also become more susceptible to cold stress because they cannot generate enough heat.

Can I add fat to broiler feed to increase energy?

Yes, adding fat is the most common way to increase energy density in broiler feed. Vegetable oils are best for young chicks, while animal fats can be used in grower and finisher diets. When adding fat, you must reformulate the entire diet to maintain the energy to protein ratio. Adding fat without adjusting protein levels will reduce growth and increase fat deposition.

How does temperature affect broiler energy requirements?

Cold temperatures increase energy requirements because birds must generate heat to maintain body temperature. This increases feed intake and worsens feed conversion. Hot temperatures reduce feed intake because digestion generates heat. To manage this, increase energy density in summer and consider slightly lower energy density in winter. Environmental management is just as important as diet formulation.

What is the best feed form for broilers?

Pellets are generally the best feed form for broilers because they increase feed intake, reduce waste, and prevent ingredient sorting. Crumbles are used for starter diets because young chicks cannot easily eat whole pellets. Mash is the least expensive but is less efficient. The cost of pelleting is usually recovered through better feed conversion.

How often should I weigh broilers to check their energy status?

Weigh birds weekly, starting at day 7. Weigh at least 50 birds or 5 percent of the flock, whichever is greater. Weigh at the same time of day each week, preferably in the morning. Compare the average weight to the strain target. This gives you an early warning if the feeding program needs adjustment.

When should I call a nutritionist about broiler energy?

Call a nutritionist if you are considering a major change to your feeding program, if birds are consistently below growth targets, or if you want to evaluate alternative ingredients. A nutritionist can reformulate diets to match your specific conditions and help you evaluate the economics of different feeding strategies. It is usually cheaper to consult a nutritionist than to lose money on an inefficient feeding program.

Related Farming Guides

This section will be populated with links to related farming guides after generation.

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
• USDA APHIS Poultry Health
• WOAH Avian Influenza
• FAO Animal Production and Health
• WOAH (World Organisation for Animal Health)

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