Pullet Management Guide: Rearing for Optimal Laying Performance

Rearing pullets is the foundation of profitable egg production. The management decisions made during the first 16 to 18 weeks of a pullet's life directly influence body weight, uniformity, skeletal development, immune competence, and subsequent laying performance. This guide covers the core aspects of pullet rearing including nutrition, lighting, housing, beak management, health monitoring, and record keeping. It is written for farmers, farm employees, veterinarians, advisers, students, and farm planners who need practical, evidence-based information for rearing replacement pullets.

At a Glance

The table below summarizes the key management areas covered in this guide and their primary focus during the rearing period.

Understanding Pullet Rearing Objectives

The rearing period is a distinct phase in the life of a laying hen. It begins at hatch and continues until the point of lay, typically around 16 to 18 weeks of age. The goal is to produce a pullet that is physically mature, uniformly grown, and ready to transition into the laying environment. Poor rearing management cannot be corrected later in the production cycle.

Body weight is the most important indicator of pullet development. Target body weight profiles are published by breeding companies for each strain. These profiles are based on extensive research and field data. Deviations from the target profile, either above or below, can lead to problems. Underweight pullets may have delayed sexual maturity and reduced peak egg production. Overweight pullets may have increased fat deposition and reproductive problems.

Uniformity is equally important. A flock with high uniformity has birds that are similar in body weight. This allows for more precise feed management and a more synchronized onset of lay. A study on broiler breeder pullets found that grading birds into weight groups every four weeks produced the highest body weight uniformity at 22 weeks of age, with a coefficient of variation of 6.2 percent. The same study found that control and high fiber treatment groups were least uniform, with coefficients of variation greater than 15 percent. This demonstrates that management practices can significantly influence flock uniformity.

Nutrition for Growing Pullets

Feed Formulation and Nutrient Density

Pullet diets must be formulated to meet the specific nutrient requirements of each growth stage. The goal is to support steady, controlled growth without excessive fat deposition. Feed formulation should be based on the strain's target body weight profile and the nutrient content of available ingredients.

Dietary energy and protein levels must be balanced carefully. High fiber diets can be used as a qualitative feed restriction method. A study on broiler breeder pullets found that birds fed a mash diet with 25 percent lower nutrient density consumed more feed and had the highest feed conversion ratio. However, this approach did little to increase flock uniformity relative to the control during the most intense period of feed restriction from 7 to 19 weeks of age.

Alternative grain sources can be incorporated into pullet diets. Research on White Leghorn pullets fed whole proso millet seed at levels up to 20 percent of the diet found no significant main effects on pullet growth or feed intake. The study concluded that whole proso millet seed can be safely fed in pullet rations at the expense of corn, soybean meal, and supplemental corn oil to keep diets isoenergetic. This is relevant for farmers in dry arid climates where water availability limits the production of traditional feed grains.

Trace Mineral Supplementation

Trace minerals play a critical role in bone development and immune function. The source of these minerals can affect their bioavailability. A study on Lohmann Brown Lite pullets from 6 to 14 weeks of age compared diets supplemented with inorganic minerals to diets with a portion of the minerals provided as amino acid-complexed minerals. The study found that birds fed amino acid-complexed minerals had tibia calcium and phosphorus contents that were 8.5 percent and 6.9 percent higher, respectively, compared to birds fed only inorganic minerals. Birds fed amino acid-complexed minerals also showed enhanced tibia bone density. Zootechnical performance was not affected by mineral source.

This research suggests that the form of trace mineral supplementation can influence skeletal development without impacting growth performance. Farmers should discuss mineral sources with their nutritionist when formulating pullet diets.

Feed Management and Restriction

Feed management during rearing depends on the strain and the target body weight profile. Some strains require quantitative feed restriction to prevent excessive weight gain. Others can be fed ad libitum with a diet formulated to limit energy intake.

Skip-a-day feeding is a traditional method of feed restriction. A study on broiler breeder pullets found that skip-a-day feed restriction produced birds with significantly lower breast muscle and higher liver weight compared to all other treatments. This method should be used with caution as it may have negative effects on body composition.

Scatter feeding is another approach that involves spreading feed on the litter to encourage foraging behavior. The same study found that scatter feeding increased flock uniformity to a small degree. This method also provides environmental enrichment and can reduce feather pecking.

Lighting Programs

Photoperiod Management

Lighting is a critical environmental factor that affects growth, behavior, and sexual maturation. The photoperiod during rearing determines when pullets become sexually mature. A controlled lighting program is essential for optimizing the transition from pullet to laying hen.

Research has shown that continuous exposure to red light can induce photorefractoriness in broiler breeder pullets. In one study, birds under supplemental red light were heavier than all other treatments from 27 weeks of age to the end of the study at 30 weeks, resulting in hens that were over 400 grams heavier. This resulted from a delayed age at first egg and lower production rate under red light, with higher intensity further hindering reproductive performance. This demonstrates that light spectrum and intensity can have significant effects on reproductive development.

A review of key farm management practices for pullets found that a combination of 8 to 10 hours of darkness and 5 to 30 lux of light intensity exposure via natural or warm white LED light achieved a welfare-performance balance in pullets. The review noted that this varies by age, strain, and activities.

Light Spectrum and Intensity

The spectral sensitivity of poultry differs from that of humans. Light intensity is measured in lux for humans and clux for poultry. A study on layer chickens found that blue-green LED light improved immune function during the brooding and rearing periods. However, the study also found that bone mineral density at 7 and 13 weeks of age and tibial strength at 13 weeks of age were significantly higher in pullets under white LED light compared to those under blue-green LED light.

This research highlights the importance of considering both immune performance and skeletal development when selecting lighting programs. Farmers should work with their advisers to determine the appropriate light spectrum and intensity for their specific housing system and strain.

Housing Systems and Environmental Enrichment

Housing Options

Pullets can be reared in a variety of housing systems including conventional cages, single-tier aviaries, multi-tier aviaries, and floor pens. A survey of 33 pullet farms in Canada found that most flocks were housed in conventional cage systems at 42.4 percent, followed by single-tier systems at 33.3 percent and multi-tier systems at 24.2 percent. The survey noted that non-cage farmers met new requirements for space, perches, and litter provision during pullet rearing, while conventional caged flocks did not have opportunities for perching and foraging.

The choice of housing system has implications for behavior, bone development, and the transition to the laying environment. A review of pullet management practices found that pullets reared under cage-free systems have better physical conditions and temperaments than those reared in cage systems, and they are more suitable to be transferred to similar housing to lay eggs.

Perches and Elevated Structures

Access to perches and elevated structures during rearing promotes load-bearing movements that improve bone quality. A study on Dekalb White pullets compared floor pens with floor perches, single-tiered aviaries, and two-tiered aviaries through 16 weeks of age. At 16 weeks, pullets reared with only floor perches had lower bone mineral density of the tibia, keel, and humerus compared to pullets reared in single-tiered or two-tiered aviaries. Most of the observed treatment differences disappeared after pullets were transferred to the layer aviary, and bone mineral density continued to increase for all hens through 30 weeks of age.

This research suggests that providing elevated structures during rearing has short-term benefits for bone quality. The study also found that pullet rearing did not affect the presence or severity of keel bone fractures in the laying period, and that the prevalence and severity of keel bone fractures increased between 26 to 28 weeks of age and remained high to 30 weeks.

Litter and Foraging Opportunities

Litter provision is important for foraging behavior and dust bathing. The Canadian survey noted that clear litter management recommendations for farmers to ensure good litter quality are needed for non-cage housing systems. Litter quality affects air quality, foot health, and behavior.

A study on brown layer pullets in an aviary system investigated the influence of dietary fiber content and the timing of aviary opening on integument characteristics and keel bone deviations. The study found significant associations between dietary fiber content and the time of opening the aviary with plumage damage and skin injuries. The back and belly plumage and skin showed more damage when the aviary was opened later and the fiber content was lower. Keel bone deviations were detected in 5.4 percent of birds at week 16.

Group Size and Stocking Density

Group size and stocking density affect aggression and feather pecking. A review of pullet management practices found that maintaining an appropriate population of 40 to 500 birds reduced flock aggressiveness. The review also found that improving flock uniformity in appearance and body size reduced the risk of pecking and injury.

Farmers should consider the recommended stocking density for their housing system and strain. Overcrowding can lead to increased stress, reduced growth, and higher mortality.

Beak Management

Beak Trimming Considerations

Beak trimming is a traditional method for controlling feather pecking and cannibalism. However, there is growing international confidence to abandon conventional practices of cage-rearing and beak trimming to improve the welfare of chickens. A review of pullet management practices noted this trend and summarized effective management practices that provide welfare benefits for pullets.

The review found that complex environments with litter, perches, straw bales, slopes, platforms, and outdoor access stimulated the activities of chickens and produced good welfare effects. Dark brooders that mimic mother hens alleviated fear and pecking behaviors in pullets. Maintaining similar housing conditions at different periods alleviates fear and discomfort among pullets.

Alternatives to Beak Trimming

Farmers who wish to avoid beak trimming should focus on environmental enrichment, appropriate lighting, and good nutrition. The review found that a combination of 8 to 10 hours of darkness and 5 to 30 lux of light intensity exposure via natural or warm white LED light achieved a welfare-performance balance in pullets.

A study on brown layer pullets kept in an aviary system with non-beak-trimmed birds found that dietary fiber content and the timing of aviary opening influenced plumage damage and skin injuries. Birds fed a moderate elevated fiber feed with crude fiber at 6.8 percent in grower and 7.8 percent in developer had less damage to the back and belly plumage and skin compared to birds fed a lower fiber feed. This suggests that nutrition can play a role in preventing feather pecking in non-beak-trimmed flocks.

Health Monitoring and Disease Prevention

Regular Welfare Monitoring

Regular welfare monitoring throughout rearing helps identify problems early and allows for timely counteractions. A study conducted in Austria developed and tested a welfare monitoring system for use during routine veterinary and technical staff visits for pullet flocks. The system was implemented in a cross-sectional study with data collected from 100 flocks on 28 rearing farms.

The study found high variability between flocks in animal-based indicators. Body weight was higher when the pre-rearing period was shorter, with higher intensities of light, with only one compared to more stockpersons, with a higher number of flock visits per day, and with a lower avoidance distance. Body weight uniformity increased with age and decreased with the duration of the light period.

This research demonstrates that regular monitoring can identify factors that affect pullet performance. Farmers should establish a routine monitoring schedule that includes both animal-based and environmental indicators.

Biosecurity and Disease Prevention

Biosecurity is essential for preventing the introduction and spread of disease. A systematic review of risk factors associated with Salmonella contamination of laying hen farms identified several management factors that increase risk. These include the presence of previous Salmonella infection, absence of cleaning and disinfection, presence of rodents, induced molting, larger flock size, multiage management, cage housing systems, in-line egg processing, rearing pullets on the floor, pests with access to feed prior to movement to the feed trough, visitors allowed in the layer houses, and trucks near farms and air inlets.

Farmers should implement a comprehensive biosecurity program that includes cleaning and disinfection between flocks, rodent control, visitor restrictions, and pest management. The review also identified high level of manure contamination, middle and late phase of production, high degree of egg-handling equipment contamination, and flock size greater than 30,000 as risk factors for Salmonella contamination of laying hen premises.

Coccidiosis Control

Coccidiosis is a significant disease in pullet rearing. A review of coccidiosis control in poultry noted that present-day control aims at reducing the numbers of parasites in the environment to levels that will not cause pathogenic effects in the host. The methods used depend upon the species of Eimeria concerned and the system of management.

The review noted that adequate disinfection is essential and that good hygiene slows down the spread of organisms. In certain cases, good hygiene alone will give sufficient control. Immunization of the host would increase the numbers of oocysts necessary to cause pathogenic effects. This method of control would only be applicable to the rearing of pullets.

Of the methods of chemoprevention available, including complementary treatment, rotation, association, and rapid alternation, the review noted that rapid alternation using shuttle and dual programs is the one most likely to reduce failure due to the development of drug resistance. Farmers should work with their veterinarian to develop a coccidiosis control program appropriate for their farm.

Growth Monitoring and Records

Body Weight and Uniformity Measurement

Regular body weight measurement is essential for monitoring pullet development. Birds should be weighed weekly or biweekly from day old through the rearing period. A representative sample of birds should be weighed individually to calculate average body weight and uniformity.

Uniformity is typically calculated as the percentage of birds within plus or minus 10 percent of the average body weight. A uniformity of 80 percent or higher is generally considered good. The study on broiler breeder pullets found that grading birds into weight groups every four weeks produced the highest body weight uniformity at 22 weeks of age with a coefficient of variation of 6.2 percent.

Record Keeping

Accurate records are essential for making informed management decisions. The following records should be maintained for each flock:

The welfare monitoring study conducted in Austria used age-specific recording sheets that comprise animal-based indicators of welfare and relevant environmental factors including housing, management, and care. This approach allows for identifying causes of problems and targeted action.

Common Failure Patterns in Pullet Rearing

Poor Uniformity

Poor uniformity is one of the most common problems in pullet rearing. It can result from inadequate feeder space, incorrect feed distribution, disease, or environmental stress. The study on broiler breeder pullets found that grading birds into weight groups every four weeks produced the highest body weight uniformity. Farmers should address the underlying causes of poor uniformity instead of relying solely on grading.

Delayed or Early Sexual Maturity

Sexual maturity is influenced by lighting and body weight. Delayed sexual maturity can result from underfeeding, inadequate lighting stimulation, or disease. Early sexual maturity can result from overfeeding or incorrect lighting programs. The study on continuous red light exposure found that birds under supplemental red light had a delayed age at first egg and lower production rate.

Feather Pecking and Cannibalism

Feather pecking and cannibalism can cause significant losses in pullet flocks. Risk factors include high light intensity, overcrowding, nutritional deficiencies, and lack of environmental enrichment. The review of pullet management practices found that improving flock uniformity in appearance and body size reduced the risk of pecking and injury.

Skeletal Problems

Skeletal problems can result from nutritional deficiencies, lack of exercise, or genetic factors. The study on pullet housing found that pullets reared with only floor perches had lower bone mineral density compared to pullets reared in aviaries. The study on trace minerals found that amino acid-complexed minerals improved tibia bone density compared to inorganic minerals.

Welfare and Safety Context

Animal Welfare Considerations

Pullet welfare is important for both ethical and production reasons. The review of pullet management practices found that improving the management practices of pullets can enhance their growth, as well as their physical and mental condition, thus benefiting the productivity of laying hens. The review identified several practices that provide welfare benefits including maintaining similar housing conditions at different periods, providing complex environments, and using appropriate lighting.

The World Organisation for Animal Health provides international standards for animal health and welfare. Farmers should be aware of the welfare standards applicable in their region and ensure their management practices meet or exceed these standards.

Worker Safety

Worker safety is an important consideration in pullet rearing facilities. Farmers should ensure that workers are trained in safe handling of birds and equipment. Proper ventilation and air quality are important for both bird and worker health. The review of pullet management practices noted that air quality of the chicken house can be effectively improved by optimizing feed formulation and ventilation, and by reducing fecal accumulation and fermentation.

Food Safety

Food safety considerations begin during the rearing period. The systematic review of risk factors for Salmonella contamination identified several management factors during rearing that increase risk. These include rearing pullets on the floor and pests with access to feed prior to movement to the feed trough. Farmers should implement biosecurity measures to reduce the risk of Salmonella introduction and spread.

The U.S. Food and Drug Administration provides animal and veterinary resources that may be relevant to pullet rearing operations. Farmers should be aware of regulations related to feed safety, medication use, and withdrawal periods.

Professional Escalation Criteria

Farmers should seek professional assistance when they encounter problems that are beyond their expertise. The following situations warrant consultation with a veterinarian or poultry specialist:

• Mortality exceeds expected levels for the age and strain
• Body weight deviates significantly from the target profile
• Feed intake changes suddenly without an obvious cause
• Signs of disease are observed including respiratory distress, diarrhea, or neurological signs
• Feather pecking or cannibalism occurs despite management interventions
• Skeletal problems are detected during routine handling
• Uniformity falls below acceptable levels despite corrective actions

The welfare monitoring study conducted in Austria demonstrated that regular monitoring during routine veterinary and technical staff visits can help identify problems early and take counteractions timely. Farmers should establish a relationship with a veterinarian who has experience with pullet rearing and laying hen production.

Frequently Asked Questions

What is the ideal body weight uniformity for pullets?

A uniformity of 80 percent or higher is generally considered good. Uniformity is calculated as the percentage of birds within plus or minus 10 percent of the average body weight. A study on broiler breeder pullets found that grading birds into weight groups every four weeks produced the highest body weight uniformity at 22 weeks of age with a coefficient of variation of 6.2 percent, while control and high fiber treatment groups were least uniform with coefficients of variation greater than 15 percent.

How often should pullets be weighed?

Pullets should be weighed weekly or biweekly from day old through the rearing period. A representative sample of birds should be weighed individually to calculate average body weight and uniformity. Regular weighing allows farmers to compare growth against the target profile and make feed adjustments as needed.

What lighting program should be used during pullet rearing?

A review of pullet management practices found that a combination of 8 to 10 hours of darkness and 5 to 30 lux of light intensity exposure via natural or warm white LED light achieved a welfare-performance balance in pullets. The review noted that this varies by age, strain, and activities. Research has shown that continuous exposure to red light can delay sexual maturation and reduce production rate.

Is beak trimming necessary for pullets?

Beak trimming is a traditional method for controlling feather pecking and cannibalism, but there is growing international confidence to abandon this practice. A review of pullet management practices found that complex environments with litter, perches, straw bales, slopes, platforms, and outdoor access stimulated the activities of chickens and produced good welfare effects. Farmers who wish to avoid beak trimming should focus on environmental enrichment, appropriate lighting, and good nutrition.

What housing system is best for pullet rearing?

The best housing system depends on the target laying environment and farm resources. A survey of pullet farms in Canada found that most flocks were housed in conventional cage systems, followed by single-tier and multi-tier systems. A review of pullet management practices found that pullets reared under cage-free systems have better physical conditions and temperaments than those reared in cage systems, and they are more suitable to be transferred to similar housing to lay eggs.

How can feather pecking be prevented in pullets?

Feather pecking can be prevented through environmental enrichment, appropriate lighting, and good nutrition. A study on brown layer pullets found that dietary fiber content and the timing of aviary opening influenced plumage damage and skin injuries. Birds fed a moderate elevated fiber feed had less damage to the back and belly plumage and skin compared to birds fed a lower fiber feed. Improving flock uniformity in appearance and body size also reduces the risk of pecking and injury.

What are the key risk factors for Salmonella contamination during rearing?

A systematic review identified several risk factors for Salmonella contamination of laying hen premises including the presence of previous Salmonella infection, absence of cleaning and disinfection, presence of rodents, rearing pullets on the floor, pests with access to feed prior to movement to the feed trough, and visitors allowed in the layer houses. Farmers should implement a comprehensive biosecurity program to address these risk factors.

When should I consult a veterinarian about my pullet flock?

You should consult a veterinarian when mortality exceeds expected levels, body weight deviates significantly from the target profile, feed intake changes suddenly, signs of disease are observed, feather pecking or cannibalism occurs despite management interventions, skeletal problems are detected, or uniformity falls below acceptable levels despite corrective actions. Regular welfare monitoring throughout rearing can help identify problems early and allow for timely counteractions.

Related Farming Guides

• Pullet Rearing Management for Future Laying Performance
• Beekeeping: Colony Nutrition, Seasonal Management, Parasite Monitoring, and Honey Harvest
• Dairy Heifer Growth Monitoring
• Camel Nutrition and Feeding Management
• Goat Nutrition and Feeding Management

References and Further Reading

• FAO Animal Production and Health. Food and Agriculture Organization of the United Nations.
• Animal Health and Welfare. USDA National Agricultural Library.
• Animal and Veterinary Resources. U.S. Food and Drug Administration.
• Animal Health and Welfare. World Organisation for Animal Health.
• Animal Production and Protection. USDA Agricultural Research Service.
• Housing and Management Practices on 33 Pullet Farms in Canada.. Animals : an open access journal from MDPI, 2019.
• Effects of broiler breeder management on pullet body weight and carcass uniformity.. Poultry science, 2015.
• Effects of Key Farm Management Practices on Pullets Welfare-A Review.. Animals : an open access journal from MDPI, 2022.
• Development and evaluation of an animal health and welfare monitoring system for veterinary supervision of pullet farms.. Preventive veterinary medicine, 2023.
• Risk Factors Associated With Salmonella in Laying Hen Farms: Systematic Review of Observational Studies.. Avian diseases, 2015.
• [Prevention of coccidiosis in poultry--a review].. Avian pathology : journal of the W.V.P.A, 1976.
• Continuous exposure to red light induces photorefractoriness in broiler breeder pullets.. Poultry science, 2023.
• Effects of blue-green LED lights with two perceived illuminance (human and poultry) on immune performance and skeletal development of layer chickens.. Poultry science, 2022.
• Research note: Proso millet as an alternative grain source in white leghorn pullet diets.. 2026.
• Effects of aviary opening times and dietary crude fiber contents on integument and keel bone condition in brown layer pullets.. 2026.
• Transcriptional and endocrine orchestration of medullary bone formation and mineral turn-over in female chickens.. 2025.
• In ovo delivery of mannan oligosaccharides and Limosilactobacillus reuteri DSM 17938 enhance early growth in layer pullets via differential modulation of intestinal morphology.. 2025.
• Amino Acid Complexed Minerals Zn, Mn, and Cu Improve Bone and Intestinal Characteristics in Laying Pullets.. 2026.
• 2025 poultry science association awards. 2025.
• Effects of pullet housing on bone development in aviary-housed Dekalb White hens.. 2024.
• ADAPTATION TO THE PULLET-REARING ENVIRONMENT BY PROVIDING LIGHTING DURING EMBRYO DEVELOPMENT. 2019.
• PSA Environment and Management : Pullets , Hens , and Eggs 361 Microwave toe trimming Leghorn pullets and its effect on rearing performance. 2001.
• A comparative examination of rearing parameters and layer production performance for brown egg-type pullets grown for either free-range or cage production. 2012.
• KEJADIAN GANGGUAN PERTUMBUHAN PADA AYAM PETELUR PERIODE PULLET DI JATMIKO FARM. 2013.
• Nutrients in manure from commercial white leghorn pullets. Journal of Applied Poultry Research, 1997.
• Predictors for plumage damage and bloody lesions indicative of feather pecking in pullets reared in aviaries. Applied Animal Behaviour Science, 2022.

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