Poultry Processing and Meat Quality: Slaughter, Carcass Grading, and Food Safety

This article covers the technical sequence of poultry slaughter, carcass grading, meat quality factors, food safety protocols, and processing plant design for poultry processors and farmers. Content is based on approved sources from FAO, USDA, FDA, and peer-reviewed literature. Practical management decisions, record-keeping requirements, common failure patterns, and professional escalation criteria are included.

At a Glance: Poultry Processing Overview

Slaughter Methods and Bleeding

Stunning Techniques

Poultry slaughter begins with stunning to render birds unconscious before bleeding. Electrical stunning in a water bath is the most common method in commercial plants. The system passes birds through an electrified water bath that induces unconsciousness. Proper stunning requires consistent voltage, amperage, and contact time. Inadequate stunning leads to poor bleeding and meat quality defects.

Controlled atmosphere stunning using carbon dioxide or nitrogen is an alternative method. This approach reduces stress and handling injuries. The FAO provides guidance on poultry production and slaughter practices through its poultry production portal. Processors must select a stunning method that matches their throughput, bird type, and regulatory requirements.

Bleeding and Exsanguination

After stunning, birds are hung on shackles and the throat is cut to allow blood drainage. Bleed time typically ranges from 90 to 180 seconds. Incomplete bleeding results in blood spots in meat and reduced shelf life. The USDA Animal and Plant Health Inspection Service monitors slaughter operations for compliance with humane handling standards.

Bleeding efficiency depends on cut location and depth. A clean cut through the carotid arteries and jugular veins ensures rapid blood loss. Poor cut technique causes delayed death and blood retention. Processors should inspect bleed lines regularly for cut quality.

Welfare Considerations During Slaughter

Poultry welfare during slaughter is a regulatory and ethical concern. The USDA National Agricultural Library provides resources on animal health and welfare standards. Key welfare indicators include:

• Birds remaining unconscious after stunning
• No signs of consciousness during bleeding
• Minimal handling stress before stunning
• Proper equipment maintenance and calibration

Processors must train staff to recognize signs of inadequate stunning. Birds that show wing flapping, vocalization, or righting reflexes after stunning require immediate corrective action. Escalation to a supervisor or veterinarian is necessary when stunning failure rates exceed acceptable limits.

Carcass Grading Systems

USDA Grading Standards

Poultry carcass grading sorts birds by quality and weight. The USDA Agricultural Marketing Service establishes grade standards for poultry. Grades include A, B, and C based on conformation, fleshing, fat cover, and defects. Grade A carcasses have no missing parts, no tears, and no discoloration.

Grading occurs after chilling. Inspectors evaluate each carcass visually. Defects that lower grade include:

• Bruises and blood spots
• Skin tears and cuts
• Missing parts such as wings or drumsticks
• Discoloration from incomplete bleeding or freezer burn

Weight Grading and Sorting

Weight grading separates carcasses into market categories. Broiler chickens are typically sorted into weight ranges such as 2 to 3 pounds, 3 to 4 pounds, and 4 to 5 pounds. Accurate weight grading requires calibrated scales and consistent shackle spacing.

Machine vision systems can automate weight grading. Research on online chicken carcass volume estimation using depth imaging and 3-D reconstruction shows potential for non-contact weight prediction. These systems use cameras and software to estimate carcass volume and weight without physical contact.

Tension analysis and online weighing methods for poultry suspension conveyors provide real-time weight data during processing. These systems measure the force on shackles as carcasses move through the line. Processors can integrate weight data with sorting equipment to direct carcasses to appropriate packaging lines.

Quality Defect Detection

Visual inspection remains the primary method for detecting quality defects. Common defects include:

• Bruising from handling or transport
• Breast blisters from prolonged sitting on wet litter
• Hock burns from ammonia exposure
• Cellulitis from bacterial infection

The Merck Veterinary Manual provides information on poultry diseases and conditions that affect carcass quality. Processors should record defect types and frequencies to identify farm-level issues. High defect rates may indicate problems with bird health, housing conditions, or transport practices.

Meat Quality Factors

Muscle Structure and Composition

Poultry meat quality depends on muscle fiber type, pH, and water-holding capacity. Breast meat is primarily white muscle fibers that contract quickly and fatigue rapidly. Leg meat contains more red fibers that support sustained activity.

Post-mortem pH decline affects meat texture and color. Normal pH decline in poultry breast meat reaches a final pH of 5.7 to 5.9 within 6 to 8 hours. Rapid pH decline causes pale, soft, exudative meat. Slow pH decline produces dark, firm, dry meat.

Factors Affecting Meat Quality

Several factors influence poultry meat quality:

• Genetics: Some broiler strains grow faster but have higher incidence of muscle myopathies
• Nutrition: Feed composition affects fat deposition and meat flavor
• Handling: Stress before slaughter depletes glycogen and alters pH
• Processing: Scalding temperature and chilling rate affect texture

The USDA Agricultural Research Service conducts research on animal production and protection, including meat quality improvement. Processors should monitor meat quality parameters such as color, pH, and water-holding capacity to identify processing issues.

Muscle Myopathies

Wooden breast, white striping, and spaghetti meat are emerging quality issues in fast-growing broilers. These conditions affect breast meat texture and appearance. Wooden breast feels hard and rigid. White striping appears as white lines parallel to muscle fibers. Spaghetti meat has a soft, stringy texture.

Affected meat may be downgraded or used for further processing. Processors should record incidence rates and communicate with growers about management practices that may reduce myopathy occurrence.

Food Safety Protocols

Pathogen Control

Poultry processing presents food safety risks from pathogens such as Salmonella and Campylobacter. The FDA provides animal and veterinary resources that include food safety guidance for poultry products. Processors must implement hazard analysis and critical control point systems to manage these risks.

Research on the diversity of Campylobacter spp. throughout the poultry processing plant shows that different species and strains persist at different processing stages. Understanding pathogen distribution helps processors target interventions effectively.

Antimicrobial Interventions

Chemical antimicrobial treatments reduce pathogen loads on carcasses. Common interventions include:

• Peracetic acid sprays or dips
• Chlorine dioxide treatment
• Organic acid rinses such as lactic or citric acid
• Cetylpyridinium chloride application

Research on all natural and clean-label preservatives and antimicrobial agents used during poultry processing and packaging explores alternatives to synthetic chemicals. These natural options include plant extracts, essential oils, and bacteriocins.

Processors must monitor antimicrobial concentration, contact time, and temperature to ensure efficacy. Overuse of antimicrobials can cause carcass discoloration or off-flavors.

Temperature Control

Rapid chilling prevents pathogen growth after slaughter. Carcasses must reach an internal temperature of 40°F (4.4°C) or below within 4 hours of slaughter. Chilling methods include:

• Immersion chilling in cold water
• Air chilling in refrigerated rooms
• Combined systems using both methods

Immersion chilling is faster but can cause moisture absorption. Air chilling produces drier carcasses with better skin quality. Processors should monitor chiller temperature and carcass temperature at multiple points.

Cross-Contamination Prevention

Cross-contamination spreads pathogens from contaminated to clean carcasses. Key prevention measures include:

• Physical separation of dirty and clean processing areas
• Proper equipment cleaning and sanitation
• Hand washing and glove changes for workers
• Water quality management in scalding and chilling tanks

Research on the impact of poultry processing operating parameters on bacterial transmission and persistence on chicken carcasses and their shelf life shows that processing conditions affect bacterial survival. Processors should adjust parameters such as water flow, temperature, and contact time to minimize contamination.

Processing Plant Design

Facility Layout

Poultry processing plant design affects efficiency, food safety, and worker safety. The facility should have a linear flow from receiving to shipping. Dirty operations such as live receiving and slaughter must be separated from clean operations such as chilling and packaging.

Key design elements include:

• Separate entrances for live birds and finished products
• Positive air pressure in clean areas
• Adequate drainage for washdown
• Non-porous surfaces for walls and floors

The FAO provides guidance on animal production and health that includes facility design principles. Processors should consult with architects and engineers experienced in food processing facility design.

Equipment Selection

Processing equipment must be durable, cleanable, and appropriate for the species and throughput. Key equipment includes:

• Stunning cabinets or water baths
• Scalding tanks with temperature control
• Defeathering machines with rubber fingers
• Evisceration equipment such as vent cutters and giblet harvesters
• Chillers with temperature monitoring

Equipment manufacturers provide specifications for capacity, cleaning requirements, and maintenance schedules. Processors should select equipment that matches their production volume and allows for future expansion.

Worker Safety

Poultry processing involves repetitive motions, sharp tools, and wet floors. Worker safety programs must address:

• Ergonomic risks from repetitive tasks
• Cuts and lacerations from knives and equipment
• Slips and falls on wet surfaces
• Noise exposure from machinery

The USDA National Agricultural Library provides resources on animal health and welfare that include worker safety considerations. Processors should implement safety training, provide personal protective equipment, and conduct regular safety audits.

Records and Measurements

Required Records

Processors must maintain records for regulatory compliance and quality management. Required records include:

• Slaughter volume by species and weight class
• Condemnation rates and reasons
• Chiller temperature logs
• Antimicrobial concentration and application records
• Pathogen testing results

Records should be reviewed daily to identify trends. Deviations from normal ranges require investigation and corrective action.

Key Performance Indicators

Processors should track key performance indicators to monitor plant performance:

• Yield: Carcass weight as percentage of live weight
• Throughput: Birds processed per hour
• Downtime: Minutes of unplanned stoppage per shift
• Defect rate: Percentage of carcasses downgraded
• Pathogen prevalence: Percentage of samples positive for target pathogens

Benchmarking against industry averages helps identify areas for improvement. Processors should set targets for each indicator and track progress over time.

Common Failure Patterns

Slaughter and Bleeding Failures

Incomplete bleeding causes blood retention in muscles and blood spots in meat. Causes include:

• Inadequate stunning that allows birds to recover
• Improper cut placement that misses major blood vessels
• Insufficient bleed time

Processors should inspect bleed lines for blood flow and check carcasses for blood retention. Adjustments to stunning parameters or cut technique may be necessary.

Scalding and Defeathering Failures

Scalding temperature and time affect feather removal and skin quality. Over-scalding causes skin damage and meat discoloration. Under-scalding leaves feathers attached.

Defeathering equipment requires regular maintenance. Worn rubber fingers fail to remove feathers effectively. Broken fingers can damage carcasses.

Evisceration Failures

Intestinal breakage during evisceration causes fecal contamination of carcasses. Contaminated carcasses require trimming or condemnation. Causes include:

• Improper equipment adjustment
• Overfilled or underfilled birds
• Operator error

Processors should inspect evisceration equipment daily and adjust for bird size. Operators should be trained to recognize and respond to breakage events.

Chilling Failures

Inadequate chilling allows pathogen growth and reduces shelf life. Causes include:

• Overloaded chiller
• High water temperature
• Insufficient contact time

Processors should monitor chiller temperature and carcass temperature at multiple points. Chiller capacity should match production volume.

Limitations and Professional Escalation

When to Escalate

Processors should escalate issues to supervisors, veterinarians, or regulatory authorities when:

• Stunning failure rates exceed 1% of birds
• Condemnation rates exceed 2% of carcasses
• Pathogen prevalence exceeds regulatory limits
• Equipment failures cause prolonged downtime
• Worker injuries require medical treatment

Escalation ensures timely corrective action and regulatory compliance. Processors should document escalation events and outcomes.

Regulatory Compliance

Poultry processing is regulated by USDA FSIS for meat inspection and FDA for food safety. Processors must comply with:

• Humane handling requirements
• Sanitation standard operating procedures
• Hazard analysis and critical control point plans
• Labeling and packaging regulations

The USDA APHIS monitors livestock and poultry disease that may affect processing. Processors should stay informed about regulatory changes and participate in industry associations.

Carcass Chilling Method Comparison: Immersion versus Air Chilling Decision Framework

Selecting the appropriate chilling method for poultry carcasses directly affects meat quality, shelf life, yield, and food safety outcomes. Processors must evaluate their specific production goals, market requirements, and facility constraints when choosing between immersion chilling and air chilling. This section provides a practical decision framework, comparative performance data, and a troubleshooting guide for common chilling failures.

Chilling Method Performance Comparison

Immersion chilling and air chilling produce distinct carcass characteristics that influence downstream processing and consumer acceptance. The primary differences center on moisture absorption, skin appearance, and microbial control.

Immersion chilling submerges carcasses in cold water, typically at 33 to 40 degrees Fahrenheit (0.5 to 4.4 degrees Celsius). Carcasses move through a counterflow system where water flows opposite to carcass direction. This method achieves rapid temperature reduction, with internal carcass temperature reaching 40 degrees Fahrenheit within 45 to 90 minutes depending on carcass size and chiller design. Moisture absorption during immersion chilling ranges from 4 to 8 percent of carcass weight, which increases yield but may require labeling if absorption exceeds regulatory limits. The USDA Food Safety and Inspection Service sets maximum moisture absorption thresholds for immersion-chilled poultry.

Air chilling uses refrigerated air at 30 to 35 degrees Fahrenheit (minus 1 to 2 degrees Celsius) with high air velocity. Carcasses hang on shackles or racks as cold air circulates around them. Cooling time ranges from 2 to 4 hours to reach target internal temperature. Moisture loss during air chilling ranges from 1 to 3 percent of carcass weight, producing a drier skin surface that improves browning during cooking. Air-chilled carcasses typically command premium prices in markets that value skin quality and reduced water content.

Research on the impact of poultry processing operating parameters on bacterial transmission and persistence on chicken carcasses and their shelf life indicates that chilling conditions affect bacterial survival and growth. Immersion chilling can spread pathogens between carcasses if water quality is not maintained. Air chilling reduces cross-contamination risk but requires longer time to achieve target temperature, which may allow pathogen growth if initial bacterial loads are high.

Decision Framework for Chilling Method Selection

Processors should evaluate five factors when selecting a chilling method: target market requirements, yield goals, food safety objectives, facility space, and energy costs.

Market requirements determine the primary driver. Retail customers who prioritize skin appearance and cooking performance often prefer air-chilled poultry. Food service operators who value consistent portion weight may prefer immersion-chilled products with predictable moisture content. Export markets may have specific chilling method requirements or moisture absorption limits.

Yield goals influence economic calculations. Immersion chilling adds 4 to 8 percent weight gain through moisture absorption, which increases saleable weight. However, processors must account for the cost of water treatment, refrigeration, and potential regulatory compliance for moisture labeling. Air chilling loses 1 to 3 percent weight, reducing saleable weight but eliminating water purchase and treatment costs.

Food safety objectives require consideration of pathogen control. Immersion chilling requires continuous water quality monitoring and antimicrobial treatment to prevent cross-contamination. Air chilling reduces waterborne pathogen spread but demands strict temperature control throughout the longer cooling period. Processors should review the diversity of Campylobacter spp. throughout the poultry processing plant to understand how chilling method affects pathogen persistence.

Facility space constraints affect feasibility. Immersion chillers require less floor space per carcass than air chilling tunnels or rooms. Air chilling systems need larger refrigerated spaces and longer dwell times, which may require facility expansion or reduced throughput.

Energy costs differ between methods. Immersion chilling uses water heating and cooling, plus water pumping and treatment. Air chilling uses refrigeration compressors and fans. Local utility rates and water availability should factor into the economic comparison.

Implementation Steps for Chilling System Selection

Processors should follow a systematic approach to evaluate and implement chilling systems.

Step 1: Define target carcass specifications. Determine acceptable moisture absorption or loss range, target internal temperature, and maximum cooling time. Document these specifications for your product categories.

Step 2: Measure current chilling performance. Record chiller inlet and outlet temperatures, carcass temperature at multiple points, cooling time, and moisture change. Use calibrated thermometers and scales. Collect data over at least five production days to capture normal variation.

Step 3: Evaluate food safety data. Review pathogen testing results for Salmonella and Campylobacter before and after chilling. Compare prevalence rates between current method and published benchmarks. Research on stress response modulation as the key to survival of pathogenic and spoilage bacteria during poultry processing highlights how processing conditions affect bacterial resilience.

Step 4: Conduct economic analysis. Calculate total chilling cost including equipment depreciation, energy, water, labor, and yield impact. Compare net profit per carcass for each method using your actual production volume.

Step 5: Pilot test alternative method. If considering a change, run a pilot trial with a small batch to measure carcass quality, yield, and microbial outcomes. Compare results against your specifications before full implementation.

Records and Measurements for Chilling Performance

Processors must maintain detailed records to verify chilling effectiveness and regulatory compliance.

Required records include:

• Chiller water or air temperature at 30-minute intervals
• Carcass internal temperature at chiller exit for every 100th carcass
• Moisture absorption or loss percentage calculated from pre-chill and post-chill weights
• Antimicrobial concentration in immersion chiller water
• Water flow rate and turnover in immersion systems
• Air velocity and humidity in air chilling systems

Key performance indicators for chilling:

• Time to reach 40 degrees Fahrenheit internal temperature
• Carcass temperature uniformity across the chiller
• Moisture change percentage
• Pathogen prevalence reduction from pre-chill to post-chill
• Shelf life measured as days to spoilage at 40 degrees Fahrenheit

Processors should review records daily and investigate any deviation from target ranges. The USDA Agricultural Research Service provides resources on animal production and protection that include chilling research findings.

Common Chilling Failure Patterns and Troubleshooting

Inadequate temperature reduction occurs when carcasses do not reach 40 degrees Fahrenheit within the required time. Causes include overloaded chiller, high incoming water or air temperature, insufficient contact time, or poor circulation. Processors should verify chiller capacity matches line speed, measure temperature at multiple points, and adjust flow rates or air velocity.

Excessive moisture absorption in immersion chillers results from long dwell time, high water temperature, or low carcass temperature differential. Processors should reduce immersion time, lower water temperature, or increase water turnover. Regulatory limits on moisture absorption require immediate corrective action when exceeded.

Excessive moisture loss in air chillers occurs from high air velocity, low humidity, or extended chilling time. Processors should reduce air speed, increase humidity, or shorten chilling duration. Excessive drying reduces yield and may cause skin cracking.

Uneven chilling produces carcasses with variable internal temperatures. Causes include uneven water flow in immersion chillers or dead air zones in air chillers. Processors should map temperature distribution across the chiller and adjust baffles, nozzles, or fan placement.

Pathogen persistence after chilling indicates inadequate antimicrobial treatment or cross-contamination. Processors should verify antimicrobial concentration and contact time, test water quality, and review sanitation procedures. The FDA provides animal and veterinary resources that include guidance on antimicrobial use in processing.

Welfare and Safety Context

Chilling method affects bird welfare indirectly through processing speed and carcass handling. Rapid chilling reduces time between slaughter and temperature reduction, which limits pathogen growth and preserves meat quality. However, excessively cold water or air can cause cold shock to carcasses if temperature differential is too large.

Worker safety considerations differ between methods. Immersion chilling requires workers to handle wet carcasses on slippery surfaces, increasing fall risk. Air chilling systems operate at lower temperatures, requiring workers to wear cold-weather protective clothing. Both methods require ergonomic assessment of lifting and reaching tasks.

Processors should consult the USDA National Agricultural Library for animal health and welfare resources that address processing conditions. Escalation to a food safety supervisor or regulatory authority is necessary when chilling failures result in pathogen prevalence exceeding regulatory limits or when moisture absorption exceeds legal thresholds.

Frequently Asked Questions

How does chilling method affect poultry shelf life? Immersion chilling can extend shelf life by rapidly reducing carcass temperature and washing surface bacteria. Air chilling produces drier skin that may inhibit bacterial growth but requires longer cooling time. Research on processing operating parameters and bacterial transmission shows that both methods can achieve acceptable shelf life when properly managed.

What is the regulatory limit for moisture absorption in immersion-chilled poultry? The USDA FSIS sets maximum moisture absorption limits based on carcass weight and chilling method. Processors must test moisture absorption regularly and label products accordingly. Exceeding limits requires corrective action and may result in regulatory enforcement.

Can a processor switch from immersion to air chilling without major facility changes? Switching chilling methods typically requires significant facility modifications. Air chilling needs larger refrigerated space, different handling equipment, and longer dwell time. Processors should conduct a feasibility study before committing to a change.

How do chilling methods affect cooking performance? Air-chilled poultry browns more evenly during roasting due to drier skin. Immersion-chilled poultry may release more moisture during cooking, affecting texture and browning. Consumer preference varies by market and cooking method.

What antimicrobial treatments are used in immersion chillers? Common antimicrobials include peracetic acid, chlorine dioxide, and organic acids. Processors must monitor concentration and contact time to ensure efficacy without causing carcass damage. Research on natural and clean-label preservatives and antimicrobial agents used during poultry processing and packaging explores alternative treatments.

How often should chiller water be tested for microbial contamination? Chiller water should be tested at least daily for total aerobic plate count and indicator organisms. Pathogen testing for Salmonella and Campylobacter should occur weekly or more frequently based on regulatory requirements and historical performance.

What causes carcass discoloration during chilling? Discoloration can result from incomplete bleeding, bruising, or chemical reactions with antimicrobials. Processors should inspect carcasses before chilling and adjust antimicrobial concentration if discoloration appears.

When should a processor escalate chilling issues to a supervisor? Escalation is necessary when carcass temperature fails to reach 40 degrees Fahrenheit within the required time, moisture absorption exceeds regulatory limits, pathogen prevalence increases, or equipment failures cause prolonged chilling interruption.

Frequently Asked Questions

What is the ideal bleed time for broiler chickens?

Bleed time for broiler chickens typically ranges from 90 to 180 seconds after throat cut. Adequate bleed time ensures complete blood removal and prevents blood spots in meat. Processors should monitor bleed line length and line speed to achieve target bleed time.

How are poultry carcasses graded for quality?

Poultry carcasses are graded based on conformation, fleshing, fat cover, and defects. USDA grades include A, B, and C. Grade A carcasses have no missing parts, no tears, and no discoloration. Grading occurs after chilling and before packaging.

What causes pale, soft, exudative poultry meat?

Pale, soft, exudative meat results from rapid pH decline in muscle after slaughter. Stress before slaughter depletes glycogen and alters pH. Rapid chilling and proper handling reduce incidence.

How can processors reduce Salmonella contamination?

Processors reduce Salmonella contamination through antimicrobial interventions, temperature control, and cross-contamination prevention. Chemical treatments such as peracetic acid and organic acids reduce pathogen loads. Rapid chilling prevents pathogen growth.

What is the difference between immersion chilling and air chilling?

Immersion chilling uses cold water to cool carcasses quickly. Air chilling uses refrigerated air and produces drier carcasses with better skin quality. Immersion chilling is faster but can cause moisture absorption. Air chilling requires longer time but reduces water usage.

How often should processing equipment be cleaned?

Processing equipment should be cleaned and sanitized at least daily. High-risk areas such as evisceration and chilling require more frequent cleaning. Processors should follow sanitation standard operating procedures and verify cleaning effectiveness through visual inspection and microbial testing.

What records must poultry processors maintain?

Processors must maintain records of slaughter volume, condemnation rates, chiller temperatures, antimicrobial applications, and pathogen testing results. Records should be reviewed daily and retained for regulatory inspection.

When should a veterinarian be consulted about carcass quality issues?

A veterinarian should be consulted when condemnation rates exceed 2% of carcasses or when unusual defects appear. High defect rates may indicate farm-level health issues that require veterinary diagnosis and management changes.

Related Farming Guides

• Broiler Chicken Farming Flock Management From Placement To Processing
• Poultry Housing Systems Design Management Broilers Layers Turkeys
• Layer Chicken Farming Pullet Development Egg Production Nutrition And Flock Health
• Mealworm Farming Production Systems Business Planning
• Propolis Production Harvesting Processing And Market Opportunities

References and Further Reading

• www.fao.org
• www.aphis.usda.gov
• www.merckvetmanual.com
• FAO Animal Production and Health. Food and Agriculture Organization of the United Nations.
• Animal Health and Welfare. USDA National Agricultural Library.
• Animal Production and Protection. USDA Agricultural Research Service.
• Animal and Veterinary Resources. U.S. Food and Drug Administration.
• Stress response modulation: the key to survival of pathogenic and spoilage bacteria during poultry processing.. Microbiology (Reading, England), 2022.
• All Natural and Clean-Label Preservatives and Antimicrobial Agents Used during Poultry Processing and Packaging.. Journal of food protection, 2017.
• Associations of Processed Meat, Unprocessed Red Meat, Poultry, or Fish Intake With Incident Cardiovascular Disease and All-Cause Mortality.. JAMA internal medicine, 2020.
• Impact of Poultry Processing Operating Parameters on Bacterial Transmission and Persistence on Chicken Carcasses and Their Shelf Life.. Applied and environmental microbiology, 2020.
• Health Risks Associated with Meat Consumption: A Review of Epidemiological Studies.. International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition, 2015.
• The diversity of Campylobacter spp. throughout the poultry processing plant.. Zoonoses and public health, 2021.
• Quality Inspection of Poultry Carcasses. Computer Vision Technology for Food Quality Evaluation, 2008.
• Grading of Chicken Carcass Weight Based on Machine Vision. Nongye Jixie Xuebao Transactions of the Chinese Society for Agricultural Machinery, 2017.
• Online chicken carcass volume estimation using depth imaging and 3-D reconstruction. Poultry Science, 2024.
• Tension analysis and online weighing method of poultry suspension conveyor. Nongye Jixie Xuebao Transactions of the Chinese Society for Agricultural Machinery, 2016.
• Reasons and determination of a bad fat consistency in pigs and poultry as well as the execution of the rapid RIC method. Fleischwirtschaft, 1996.

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