Poultry Housing Systems: Comparing Free-Range, Barn, and Cage Systems for Welfare and Productivity

Choosing a poultry housing system requires balancing bird welfare, production output, labor demands, and capital costs. This article compares free-range, barn, and cage systems for laying hens and broilers, with a decision table to help match housing choices to specific flock goals. The evidence draws on peer-reviewed research and official animal health sources to support practical management decisions.

Scope and Reader Context

Farmers, farm employees, veterinarians, advisers, and students need a clear framework for evaluating housing options before building or converting facilities. The comparison covers conventional cages, furnished or enriched cages, barn systems, aviaries, and free-range systems. For broilers, the comparison includes controlled-environment housing, deep litter, and free-range management. The focus is on commercial-scale production decisions, not backyard flocks.

Housing system choice affects daily management routines, disease pressure, labor requirements, and record keeping. Each system presents distinct welfare challenges and productivity outcomes. No single housing system is ideal from a welfare perspective, and each system has unique challenges that require active management [6]. The decision table at the end of this section provides a structured way to evaluate options against specific flock goals.

Core Principles of Poultry Housing

Welfare Outcomes Are System-Specific

Research comparing conventional cages, furnished cages, noncage systems, and outdoor systems shows that specific attributes of each system affect welfare in predictable ways [6]. Systems with similar attributes tend to produce similar welfare outcomes. For example, environments where hens access litter and soil, such as noncage and outdoor systems, provide greater opportunity for disease and parasites. More complex environments are harder to clean, and larger group sizes allow disease and parasites to spread more easily [6].

Conventional cages that limit movement can lead to osteoporosis, while noncage systems with increased complexity expose hens to a higher incidence of bone fractures [6]. More space allows hens to perform a greater repertoire of behaviors, but some harmful behaviors such as cannibalism and piling, which results in smothering, can occur in large groups [6]. Selective breeding for traits such as improved bone strength and reduced feather pecking and cannibalism may help improve welfare across all systems [6].

Productivity and Physiology Interact with Housing

Housing conditions shape the internal physiological state of laying hens. Research comparing battery cages, barn systems, and free-range systems found that barn and free-range housing promoted behavioral diversity compared to cages [14]. Transcriptome analysis revealed enrichment of insulin resistance-related pathways in the brain and liver of caged hens, while barn and free-range hens showed enhanced norepinephrine signaling in the cerebrum [14]. Glucose tolerance testing confirmed that barn and free-range hens tended to exhibit higher insulin sensitivity and enhanced norepinephrine signaling compared with caged hens [14]. These findings suggest that environment-enriched cage-free housing contributes to improved metabolic and neurophysiological signaling [14].

Air Quality Is a Critical Management Variable

Alternative housing systems that provide litter access present air quality challenges. Housing systems where laying hens have access to litter, such as aviaries and floor systems, consistently have higher concentrations of suspended dust than caged hens with little or no litter access [9]. Higher dust levels in aviaries and floor housing are also caused by increased bird activity in noncage systems [9]. High dust levels may compromise the health and welfare of both birds and their caretakers [9].

Ammonia concentrations are commonly high in aviaries and floor housing systems where manure is not regularly removed, whereas they are usually lower in furnished cages [8]. High ammonia levels are found during the cold season when ventilation flow is often reduced [8]. High concentrations of gaseous ammonia can have adverse health effects and, when very high, influence production performance [8]. The most profound effects are lesions in the respiratory tract and keratoconjunctivitis, and high ammonia concentrations predispose poultry to respiratory disease and secondary infections [8]. Development of improved systems and management routines for manure removal and ventilation is important for reducing ammonia levels and safeguarding hen welfare [8].

At a Glance: Housing System Comparison

The following decision table compares the three main housing categories across key management factors. Use this table to screen options before conducting a detailed financial and operational analysis.

Data synthesized from [6], [8], [9], [11].

Practical Assessment Steps for Housing Selection

Step 1: Define Flock Goals and Constraints

Before evaluating housing systems, document the primary production goals. Consider whether the operation prioritizes maximum egg output, premium pricing from free-range or pasture-raised products, lower mortality rates, or reduced capital investment. Also document local market requirements, available land area, climate conditions, and labor availability.

Step 2: Evaluate Disease and Biosecurity Implications

Review the disease history of the farm and surrounding area. Housing systems with outdoor access increase exposure to pathogens carried by wild birds and soil-borne organisms [6]. Free-range systems also present challenges from exposure to disease-causing organisms and foodborne pathogens [13]. If the farm has a history of Salmonella or other pathogens, factor this into the housing decision.

Step 3: Assess Ventilation and Air Quality Capacity

Barn and aviary systems require robust ventilation systems to manage dust and ammonia. Research shows that aviaries and floor housing systems consistently have higher dust concentrations than caged systems [9]. Ammonia levels are commonly high in these systems when manure is not regularly removed [8]. Evaluate whether the existing or planned ventilation infrastructure can maintain air quality within recommended ranges throughout the year, especially during cold seasons when ventilation flow is reduced [8].

Step 4: Calculate Labor Requirements

Different housing systems require different labor inputs. Cage systems generally require less cleaning labor but still need routine inspection. Barn systems require more litter management and cleaning. Free-range systems require additional range management, predator control, and egg collection from nest boxes. Research on free-range eggs shows that eggs collected from bedding substrate have significantly higher counts of thermotolerant coliforms, psychrotrophs, and Staphylococcus compared to nest-collected eggs [19]. This finding supports the recommendation that eggs be collected from nest boxes right after laying, while eggs laid on the bedding substrate should be excluded from human consumption [19]. This labor requirement should be factored into the housing decision.

Step 5: Review Mortality Records and Targets

Mortality patterns differ significantly between housing systems. A meta-analysis of ten studies comprising 3,851 flocks found that mortality was higher in loose housing systems than in cages and variable within system [11]. Cumulative mortality was higher in flocks with intact beaks than in those with trimmed beaks [11]. For free-range systems, producer recorded cumulative mortality at 60 to 80 weeks of age averaged 10 percent but with a range from 0 to 69.3 percent [11]. Reducing cumulative mortality to levels currently achieved by the first quartile could reduce flock greenhouse gas emissions by as much as 25 percent [11]. Use these benchmarks when setting mortality targets for each housing system.

Housing System Options and Tradeoffs

Conventional and Furnished Cages

Conventional cages limit movement and can lead to osteoporosis [6]. Furnished cages provide nesting areas, perches, and litter for dust bathing, which improves behavioral opportunities while maintaining some benefits of cage housing. Research comparing conventional cages, enriched cages, and aviary systems found that hens in aviaries showed lower productivity compared to conventional and enriched cages [24]. Egg laying rate of enriched cages was higher than that of conventional cages [24].

Caged hens showed diurnal patterns of autonomic nervous function, suggesting that parasympathetic nervous activity is predominant during the dark phase [24]. These diurnal patterns were unclear in hens raised in aviaries, which implies that aviaries may suppress parasympathetic nervous activity during the dark phase and diminish rest quality [24]. The study concluded that aviary systems could be harmful to egg production and welfare of hens, and that enriched cage systems seem to offer a balanced approach [24].

However, feather condition in cage systems deteriorates with age. Research comparing cage and aviary systems found that cage hens showed higher plumage damage scores than aviary hens, though both systems showed increases in comb pecking wounds and feather damage over time [28]. Cage hens exhibited more negative behaviors such as fearfulness and depression, while aviary hens showed more positive behaviors such as being active and energetic [28]. Cage hens had higher yolk corticosterone levels at 48 weeks but produced heavier eggs consistently across all periods [28].

Barn and Aviary Systems

Barn systems house birds in a single-level floor system, while aviaries use multiple tiers to increase bird density. Both provide litter access and more space for behavioral expression. Research on commercial enriched colonies and commercial aviaries found that hens housed in aviaries had a significantly higher predicted probability of keel bone fractures and footpad dermatitis [10]. No difference was observed in overall feather damage between housing systems, but the predicted probability of feather damage in the cloacal region was higher for birds housed in enriched colonies [10].

Significant increases with age were observed for keel deviation, damaged feather coverage, feather uncleanliness, and laying status for both systems [10]. Aviaries negatively affected the predicted probability of footpad dermatitis compared to the baseline for all time points assessed [10].

Environmental conditions vary by tier in aviary systems. Research using Internet of Things-based monitoring in a multi-tiered aviary found that the middle tier, where nests were located, exhibited higher humidity and carbon dioxide and particulate matter concentrations compared to the upper tier and floor, suggesting reduced airflow [20]. Hen presence on the floor was highest in the midday and correlated with increased particulate matter and ammonia concentrations [20]. Hens occupied the upper tier more in June than in January, correlating with lower humidity and particulate matter levels [20]. Understanding daily and seasonal changes in environmental gradients at different aviary tiers can inform proactive management [20].

Free-Range Systems

Free-range systems provide outdoor access in addition to indoor housing. These systems offer the greatest behavioral opportunities but also present the highest disease and parasite pressure [6]. Free-range systems also present challenges from exposure to disease-causing organisms and foodborne pathogens [13].

Mortality in free-range systems is highly variable. Producer recorded cumulative mortality at 60 to 80 weeks of age averaged 10 percent but ranged from 0 to 69.3 percent [11]. This wide range indicates that management quality strongly influences outcomes in free-range systems.

Egg quality in free-range systems depends on collection practices. Research on free-range eggs found that eggs from bedding had significantly higher counts of thermotolerant coliforms, psychrotrophs, and Staphylococcus compared to nest-collected eggs [19]. Bedding substrates showed higher counts of mesophilic aerobes, psychrotrophs, Staphylococcus, and Clostridium compared to nest box substrates [19]. Eggs from bedding showed compromised internal microbiological quality, with coliform values exceeding 2 log10 most probable number per milliliter [19]. Ten percent of evaluated pools were suggestive of the presence of Salmonella species in the internal components of bedding eggs and on the shells of nest eggs [19]. These findings strongly support collecting eggs from nest boxes right after laying and excluding bedding eggs from human consumption [19].

Broiler Housing Systems

Broiler housing research shows similar tradeoffs between productivity and welfare. A study comparing traditional cages, deep litter, free-range, and environmentally controlled systems found that the controlled-environment group showed the highest weight gain and the lowest feed conversion ratio, suggesting improved production efficiency [23]. The free-range system exhibited higher mortality rates while fostering better behavioral welfare through natural behaviors such as foraging and dust bathing [23]. Traditional cages had moderate welfare scores and were less favorable in promoting natural behaviors [23]. Deep litter systems provided moderate welfare benefits and weight gain but were less efficient in feed conversion [23]. The study concluded that housing systems require balancing productivity, animal welfare, and environmental sustainability [23].

Skeletal health is a vital factor in welfare, productivity, and sustainability in modern broiler production systems [22]. Rapid genetic selection for high growth rates and breast muscle yield, combined with intensive housing and high population densities, has increased the occurrence of leg disorders such as tibial dyschondroplasia, angular deformities, and fractures [22]. Housing design, environmental enrichment, and flooring management encourage voluntary movement and mechanical loading, stimulating bone remodeling [22]. Population density and stocking practices directly influence activity patterns, mechanical stimuli, and stress levels [22].

Observations and Measurements for Housing Assessment

Health and Welfare Indicators

Regular health and welfare assessments should include the following measurements:

• Footpad dermatitis scoring through visual examination
• Feather damage and feather cleanliness scoring
• Keel bone deviation and keel bone fracture detection through palpation
• Wing fracture assessment
• Body condition scoring
• Laying status verification

Research on commercial flocks used these indicators to compare enriched colonies and aviaries, with 12 birds randomly selected per visit for individual examination [10]. This sampling approach provides a practical model for routine flock monitoring.

Behavioral Observations

Behavioral assessment provides insight into welfare status. The avoidance distance test measures how quickly hens respond to an observer, and the novel object test measures approach behavior. Research found that aviary hens responded more quickly to the observer in the avoidance distance test and more approached the novel object compared to cage hens [28]. Cage hens exhibited more negative behaviors such as fearfulness and depression [28].

Environmental Monitoring

For barn and aviary systems, continuous monitoring of temperature, humidity, ammonia, carbon dioxide, and particulate matter is recommended. Research using Internet of Things-based monitoring recorded environmental conditions every 10 minutes, 24 hours per day, at three heights in an aviary system [20]. This level of monitoring allows identification of problem areas within the housing system and supports proactive management [20].

Physiological Measurements

Heart rate variability analysis can assess autonomic nervous function as a way to investigate stress and welfare on poultry farms [24]. Research using telemetry systems to continuously record electrocardiogram, heart rate, body temperature, and locomotor activity found that hens in all housing systems showed diurnal heart rate and locomotor activity patterns [24]. Cage systems showed diurnal patterns of autonomic nervous function, while these patterns were unclear in aviary-raised hens [24].

Records and Documentation

Mortality Records

Detailed mortality records are essential for evaluating housing system performance. The meta-analysis of laying hen mortality highlighted the need for detailed records of the causes of mortality so that improved genotypes can be developed for different systems and different breeds can be better managed within systems [11]. Record mortality by cause, age, and housing location within the facility.

Production Records

Track hen-day egg production, egg weight, egg quality parameters, and feed conversion for each housing system. Research comparing individual cages, colony cages, and floor housing found significant differences in sexual maturity, hen-day egg production, and egg qualities between housing conditions [25]. Individual cages had lower age at sexual maturity than floor housing [25]. During 28 to 32 weeks, individually caged layers had significantly higher hen-day egg production than colony or floor reared layers [25]. However, during 32 to 36 weeks in peak summer, colony reared layers had more egg production [25]. Significant differences were found in yolk weight, yolk index, albumin index, and Haugh unit between housing systems [25]. Yolk color was significantly darker in individual and colony cages compared to floor reared birds [25].

Air Quality Records

Maintain records of ammonia and dust measurements, especially during cold seasons when ventilation flow is reduced [8]. Document ventilation settings, manure removal schedules, and any air quality incidents. These records support management decisions and help identify patterns that predict air quality problems.

Egg Collection and Quality Records

For free-range systems, document egg collection frequency and location. Research strongly recommends that eggs be collected from nest boxes right after laying, while eggs laid on the bedding substrate should be excluded from human consumption [19]. Track the proportion of nest eggs versus floor eggs to identify management issues.

Common Failure Patterns

Failure Pattern 1: Inadequate Ventilation in Barn and Aviary Systems

Barn and aviary systems consistently have higher dust concentrations than caged systems [9]. Ammonia levels are commonly high in these systems when manure is not regularly removed [8]. Failure to maintain adequate ventilation leads to respiratory lesions, keratoconjunctivitis, and increased susceptibility to respiratory disease [8]. Prevention requires regular manure removal, ventilation system maintenance, and seasonal adjustments to airflow.

Failure Pattern 2: Ignoring Tier-Specific Environmental Variation

In multi-tier aviary systems, environmental conditions vary by tier. Research found that the middle tier, where nests were located, exhibited higher humidity and carbon dioxide and particulate matter concentrations compared to the upper tier and floor [20]. Failure to monitor and manage tier-specific conditions can lead to chronic respiratory problems in hens occupying problem areas.

Failure Pattern 3: Inadequate Egg Collection in Free-Range Systems

Eggs laid on bedding substrate show compromised internal microbiological quality [19]. Failure to collect eggs from nest boxes promptly and to exclude bedding eggs from human consumption creates food safety risks. This failure pattern is preventable through labor allocation and collection protocols.

Failure Pattern 4: Underestimating Mortality Variability in Loose Housing

Mortality in loose housing systems is higher and more variable than in cages [11]. Free-range cumulative mortality ranged from 0 to 69.3 percent across flocks [11]. Failure to plan for this variability can lead to significant financial losses. Management practices that reduce cumulative mortality to levels achieved by the first quartile could reduce flock greenhouse gas emissions by as much as 25 percent [11].

Failure Pattern 5: Overlooking Age-Related Welfare Decline

Both cage and cage-free systems show significant increases with age in keel deviation, damaged feather coverage, feather uncleanliness, and laying status changes [10]. Footpad dermatitis increases with age in aviary systems [10]. Failure to adjust management as flocks age leads to worsening welfare outcomes and reduced productivity.

Welfare and Safety Context

Worker Safety Considerations

Air quality in poultry housing affects both birds and caretakers. High dust levels may compromise the health and welfare of both birds and their caretakers [9]. Workers in barn and aviary systems should use appropriate respiratory protection, especially during activities that generate dust such as litter management and cleaning.

Food Safety Considerations

Egg collection practices directly affect food safety. Eggs from bedding substrate show compromised internal microbiological quality, and some pools were suggestive of the presence of Salmonella species [19]. The recommendation to collect eggs from nest boxes right after laying and exclude bedding eggs from human consumption is a food safety measure [19].

Free-range and pasture-raised systems present challenges from exposure to disease-causing organisms and foodborne pathogens [13]. Probiotics can be supplemented in poultry diets as commercial feed additives to mitigate pathogenic organisms and improve egg and meat quality and production [13].

Regulatory and Policy Context

Animal welfare concerns continue to be a critical component of law and policies associated with commercial food animal production [13]. Social and market pressures are driving forces behind legislation and result in the change of poultry production management systems [13]. The movement toward cage-free and aviary-based egg production systems has become standard practice in many markets [13]. For broiler production, pasture-raised and free-range management systems have become more popular [13].

The European Union ban on conventional barren cages for laying hens from 2012 improved many aspects of laying hen welfare [8]. Production systems must now provide hens with access to a nest, a perch, and material for dust bathing [9]. These requirements improve behavioral aspects of animal welfare, but when hens are kept with access to litter, polluted air may become an increased threat to health and therefore also a welfare problem [9].

Environmental Stress

Environmental stress caused by conventional housing conditions can negatively affect well-being and productivity [26]. High temperature, overcrowding, poor ventilation, insufficient lighting, and wire cages are some of the most prominent stressors in conventional housing systems [26]. Strategies to address environmental stress include using anti-stress feed additives and enriching cages to improve bird behavioral activities and welfare [26].

Limitations and Professional Escalation Criteria

Research Limitations

Research on welfare in different housing systems is still in the early stages [6]. Multiple factors such as disease, skeletal and foot health, pest and parasite load, behavior, stress, affective states, nutrition, and genetics influence the level of welfare hens experience [6]. Less is understood about the stress that each system imposes on the hen, and it appears that each system has its unique challenges [6].

There are gaps in both basic and applied knowledge of how birds react to dust and aerosol contaminants, including what levels they find aversive or that impair health [9]. More research is needed to understand the genetic by environment interaction in different housing systems [11].

Professional Escalation Criteria

Contact a veterinarian or poultry specialist when any of the following conditions are observed:

• Cumulative mortality exceeds the expected range for the housing system, particularly if free-range mortality approaches the upper end of the recorded range [11]
• Keel bone fracture or footpad dermatitis rates increase significantly beyond baseline for the housing system [10]
• Ammonia concentrations remain high despite ventilation adjustments and manure removal [8]
• Respiratory disease or keratoconjunctivitis appears in multiple birds [8]
• Salmonella is suspected or confirmed in egg samples [19]
• Behavioral problems such as cannibalism or piling occur in large groups [6]
• Mite infestations reach levels that affect welfare parameters [18]

Northern fowl mites are the most economically important and damaging ectoparasite in the U.S. egg industry [18]. The heterogeneous nature of mite infestation poses a unique welfare challenge, with some hens becoming severely infested and others more resistant [18]. Higher infestation levels are associated with worse skin lesion and skin inflammation scores [18]. Professional intervention is warranted when mite populations reach levels that affect body weight, feather condition, or skin health.

Frequently Asked Questions

What is the main difference between cage, barn, and free-range housing systems?

Cage systems confine hens in wire enclosures with limited movement and behavioral opportunities. Barn systems house hens in a floor-based environment with litter access and more space for behavioral expression. Free-range systems provide outdoor access in addition to indoor housing. Each system presents distinct welfare challenges and productivity outcomes, and no single housing system is ideal from a welfare perspective [6].

Which housing system has the lowest mortality rate?

Cage systems generally have lower cumulative mortality than loose housing systems [11]. Mortality is higher in loose housing systems than in cages and variable within system [11]. Free-range systems show the widest mortality range, with producer recorded cumulative mortality at 60 to 80 weeks of age averaging 10 percent but ranging from 0 to 69.3 percent [11].

How does housing system affect bone health in laying hens?

Conventional cages that limit movement can lead to osteoporosis [6]. Environments with increased complexity, such as noncage systems, expose hens to an increased incidence of bone fractures [6]. Research comparing enriched colonies and aviaries found that hens housed in aviaries had a significantly higher predicted probability of keel bone fractures [10].

What air quality challenges are associated with barn and free-range systems?

Barn and aviary systems consistently have higher concentrations of suspended dust than caged systems [9]. Ammonia concentrations are commonly high in aviaries and floor housing systems where manure is not regularly removed [8]. High ammonia levels are found during the cold season when ventilation flow is often reduced [8]. These air quality challenges require active ventilation management and regular manure removal [8].

How does housing system affect egg production?

Research comparing conventional cages, enriched cages, and aviary systems found that hens in aviaries showed lower productivity compared to conventional and enriched cages [24]. Egg laying rate of enriched cages was higher than that of conventional cages [24]. Cage hens produced heavier eggs consistently across all periods compared to aviary hens [28].

What are the food safety considerations for free-range egg production?

Eggs collected from bedding substrate have significantly higher counts of thermotolerant coliforms, psychrotrophs, and Staphylococcus compared to nest-collected eggs [19]. Eggs from bedding showed compromised internal microbiological quality, and some pools were suggestive of the presence of Salmonella species [19]. Eggs should be collected from nest boxes right after laying, while eggs laid on the bedding substrate should be excluded from human consumption [19].

How does housing system affect feather condition?

Feather condition in cage systems deteriorates with age, showing higher plumage damage scores than aviary hens [28]. Both systems show increases in comb pecking wounds and feather damage over time [28]. The predicted probability of feather damage in the cloacal region was higher for birds housed in enriched colonies compared to aviaries [10].

What role does enrichment play in cage-free systems?

Enrichment can increase species-specific behaviors without substantially affecting egg production or quality. Research on enrichment with live black soldier fly larvae in an aviary system found that enrichment increased the number of birds on the floor, the proportion of clean eggs, and the proportion of eggs laid in the nest, while reducing inactivity and floor pecking [21]. Enrichment improved space use as eggs laid in the nests increased at the expense of floor eggs, which resulted in an improvement of production [21].

Related Farming Guides

• Cage-Free Chicken Farm Management: Housing, Welfare, and Egg Production
• Cage-Free Layer Housing and Flock Management
• Veal Production Systems: Housing, Nutrition, and Welfare
• Free Range Pig Farming: Regulations, Housing, and Welfare
• Outdoor Pig Production Systems: Management, Welfare, and Economics

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.
• Hen welfare in different housing systems.. Poultry science, 2011.
• Poultry housing and husbandry.. British poultry science, 2010.
• Air Quality in Alternative Housing Systems may have an Impact on Laying Hen Welfare. Part II-Ammonia.. Animals : an open access journal from MDPI, 2015.
• Air Quality in Alternative Housing Systems May Have an Impact on Laying Hen Welfare. Part I-Dust.. Animals : an open access journal from MDPI, 2015.
• Alternative housing systems have mixed impacts on health and welfare of laying hens.. Poultry science, 2025.
• Implications for Welfare, Productivity and Sustainability of the Variation in Reported Levels of Mortality for Laying Hen Flocks Kept in Different Housing Systems: A Meta-Analysis of Ten Studies.. PloS one, 2016.
• Review: Current challenges in poultry nutrition, health, and welfare.. Animal : an international journal of animal bioscience, 2023.
• Probiotics and potential applications for alternative poultry production systems.. Poultry science, 2021.
• Multi-tissue transcriptomic profiling reveals the internal physiological landscape of laying hens in cage and cage-free systems.. 2026.
• Exploring the relationships between the gut microbiome composition and movement patterns of laying hens in a multitier cage-free housing system.. 2026.
• Impact of Farm Management Practices on Salmonella Occurrence at the Farm Level-A Blend of Traditional Methods and Artificial Intelligence. 2026.
• Evaluation of Pulsed Alternating Wavelength System Lighting on the Welfare Quality and Serotonin Turnover of Commercial Laying Hens Throughout a Lay Cycle.. 2026.
• The relationship between infestation level and the welfare of cage-free laying hens experimentally infested with northern fowl mites.. 2026.
• Microbiological Quality of Free-Range Eggs from Nest Boxes and Litter in the Late Production Stage in Southeastern Brazil.. 2025.
• Environmental Gradients and Hen Spatial Distribution in a Cage-Free Aviary System: Internet of Things-Based Real-Time Monitoring for Proactive Management.. 2025.
• Enrichment with Hermetia illucens live larvae in a cage-free system: effects on welfare and egg production and quality in laying hens of two genotypes.. 2026.
• Improving bone health in broiler chickens: integrating population density, housing, and nutritional strategies for enhanced welfare and productivity. Poultry Science and Management, 2025.
• Effect of Various Types of Housing Systems in Poultry Especially Broilers. Indus Journal of Bioscience Research, 2024.
• Evaluation of physiological functions and production performance in laying hens in three different housing systems. Poultry Science, 2025.
• Productivity, reproduction and welfare status of White Leghorn hens under cage and floor housing systems. Indian Journal of Poultry Science, 2019.
• Feed additives and enrichment materials to reduce chicken stress, maximize productivity, and improve welfare. Veterinary World, 2024.
• The Welfare Status of Hens in Different Housing Systems - A Review. 2021.
• Welfare characteristics of laying hens in aviary and cage systems. Poultry Science, 2025.
• Stocking density: a clue for improving social behavior, welfare, health indices along with productivity performances of quail (Coturnix coturnix)-a review. Tropical Animal Health and Production, 2022.
• Alternative systems for poultry: Health, welfare and productivity. Alternative Systems for Poultry Health Welfare and Productivity, 2012.
• Animal welfare with Chinese characteristics: Chinese poultry producers’ perceptions of, and attitudes towards, animal welfare. Plos One, 2024.
• Effect of different housing systems on productivity and welfare of laying hens. Annals of Animal Science, 2010.
• Housing systems and their impact on egg quality and hatchability in Rhode Island red hens. Indian Journal of Animal Sciences, 2026.

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