# Poultry Hatchery Management: Incubation, Sanitation, and Chick Quality ## Key Takeaways - Optimal egg storage requires maintaining 55-65°F (13-18°C) and 75-80% relative humidity for eggs held less than 7 days to preserve embryo viability and hatchability; longer storage necessitates cooler temperatures (50-55°F or 10-13°C) and daily turning if exceeding 7 days. - Precise incubation temperature control, typically 99.5°F (37.5°C) dry bulb for forced-air incubators, is critical for normal embryonic development, with humidity levels adjusted from 50-55% during incubation to 65-75% during the hatch period. - Hatchery sanitation protocols, including sanitizing eggs within 2 hours of collection using approved agents like hydrogen peroxide or quaternary ammonium compounds, and rigorous cleaning/disinfection of incubators and hatchers between cycles, are essential to mitigate microbial contamination, particularly Salmonella. - Chick quality assessment within 12 hours of hatch, evaluating physical attributes (navel closure, yolk sac absorption) and behavioral indicators (activity, righting reflex), is crucial for identifying and culling compromised individuals, thereby ensuring the shipment of only vigorous, healthy chicks. - Comprehensive record-keeping of incubation parameters, egg handling, sanitation events, and chick quality grades, alongside calculation of key performance indicators like hatchability and cull rate, enables proactive problem identification and continuous improvement in hatchery operations. - Biosecurity measures, including personnel hygiene, visitor restrictions, and dedicated waste management zones, are paramount to prevent disease transmission, with escalation criteria for consulting veterinarians or regulatory authorities defined by significant drops in hatchability or detection of pathogens like Salmonella. --- Hatchery managers and poultry farm owners must control incubation parameters, egg handling, sanitation protocols, and chick quality assessment to produce healthy, uniform chicks while limiting disease transmission. This article covers these core areas for commercial hatcheries and small hatchery businesses, drawing on published research and official sources to support practical decision-making. ## At a Glance | Management Area | Key Practice | Expected Outcome | |-----------------|--------------|------------------| | Egg storage | Maintain 55-65°F (13-18°C) and 75-80% relative humidity for eggs held less than 7 days | Preserve embryo viability and hatchability | | Incubation temperature | Set at 99.5°F (37.5°C) dry bulb for forced-air incubators | Normal embryonic development and hatch window | | Hatchery sanitation | Apply approved sanitizers to hatching eggs within 2 hours of collection | Reduce microbial load on eggshells | | Chick processing | Grade chicks within 12 hours of hatch using physical and behavioral criteria | Ship only vigorous, healthy chicks | ## Egg Handling and Storage for Hatchability Egg handling begins at the breeder farm. Collect eggs at least four times daily to prevent contamination and overheating. Discard floor eggs, cracked eggs, and eggs with visible fecal soiling because they carry higher microbial loads. The FAO Poultry Production and Products resource emphasizes that egg quality at collection directly affects hatchability and chick health. ### Temperature Management During Storage Store hatching eggs in a dedicated cooler with temperature control. The ideal storage temperature depends on the expected holding period. For eggs held less than 7 days, maintain 55-65°F (13-18°C). For longer storage up to 14 days, use 50-55°F (10-13°C). Relative humidity should remain at 75-80% to prevent moisture loss through the eggshell. Turn eggs during storage if holding exceeds 7 days. Turn them once daily at a 45-degree angle to prevent the embryo from adhering to the shell membrane. Record storage temperature, humidity, and turning schedule daily. ### Egg Selection and Grading Candle all eggs before setting to remove those with cracks, thin shells, or abnormal shapes. Weigh a sample of eggs from each breeder flock to monitor egg size uniformity. Eggs that are too small produce small chicks with lower viability. Eggs that are too large have lower hatchability due to poorer gas exchange. Set eggs within 10 days of lay for optimal hatchability. Hatchability declines progressively after 7 days of storage, with a more rapid decline after 14 days. Document the breeder flock age, egg storage duration, and number of eggs set for each hatch. ## Incubation Parameters and Equipment Management Incubation requires precise control of temperature, humidity, and ventilation. The Merck Veterinary Manual Poultry section provides reference information on incubation conditions for commercial hatcheries. ### Temperature Control Set the incubator dry bulb temperature at 99.5°F (37.5°C) for forced-air machines. For still-air incubators, use 101-102°F (38.3-38.9°C) measured at the top of the eggs. Monitor temperature at multiple points within the incubator because temperature gradients of 1-2°F can occur between shelves. Check incubator temperature every 2 hours during operation. Calibrate thermometers against a certified reference thermometer monthly. Record temperature readings on a log sheet with date, time, and operator initials. ### Humidity Management Maintain 50-55% relative humidity during the first 18 days of incubation. Increase to 65-75% during the hatch period (days 19-21). Low humidity causes excessive moisture loss from eggs, resulting in small chicks with sticky shells. High humidity reduces moisture loss, leading to large chicks with unabsorbed yolk sacs. Weigh a sample tray of eggs weekly to calculate moisture loss. Target 12-14% weight loss by day 18 of incubation. Adjust humidity settings based on weight loss data. ### Ventilation and Carbon Dioxide Levels Provide fresh air exchange to maintain carbon dioxide levels below 0.5% (5000 ppm) in the incubator. Higher carbon dioxide levels reduce hatchability and increase early embryo mortality. Open ventilation ports according to the incubator manufacturer specifications. Increase ventilation during the hatch period because embryos produce more carbon dioxide as they approach pipping. Monitor carbon dioxide levels with a portable gas detector if available. Record ventilation settings and any adjustments made during the incubation cycle. ## Hatchery Sanitation Protocols Hatchery sanitation is critical for preventing disease transmission and producing clean chicks. The study "Salmonella Biomapping of a Commercial Broiler Hatchery" (Journal of Food Protection, 2024) demonstrates that hatcheries can harbor Salmonella in multiple locations, including incubators, hatchers, and chick processing areas. ### Egg Sanitization Sanitize hatching eggs within 2 hours of collection. Use approved sanitizers such as formaldehyde gas, hydrogen peroxide, or quaternary ammonium compounds. The review "Effects of Sanitizers on Microbiological Control of Hatching Eggshells and Poultry Health during Embryogenesis and Early Stages after Hatching in the Last Decade" (Animals, 2022) summarizes research on various sanitizer options. Apply sanitizers according to manufacturer label instructions. Do not exceed recommended concentrations because over-application can damage the eggshell cuticle and reduce hatchability. Record the sanitizer type, concentration, application method, and date for each batch of eggs. ### Incubator and Hatcher Cleaning Clean and disinfect incubators and hatchers between each hatch cycle. Follow these steps: 1. Remove all egg trays, chick baskets, and debris. 2. Sweep and vacuum all surfaces. 3. Wash with hot water and detergent using a pressure washer. 4. Rinse with clean water. 5. Apply a disinfectant approved for hatchery use. 6. Allow surfaces to dry completely before loading the next batch. Test cleaned surfaces for microbial contamination using contact plates or swabs. Set acceptable limits for total aerobic plate counts and target zero for Salmonella and Escherichia coli. Document cleaning dates, disinfectant used, and test results. ### Personnel and Visitor Biosecurity Implement biosecurity protocols for all personnel entering the hatchery. The article "Biosecurity Compliance and Its Applications in Poultry Production Sectors" (Journal of World's [Poultry Research](/knowledge/animal-farming/poultry/poultry-research-how-to-find-and-evaluate-scientific-studies), 2024) emphasizes that biosecurity compliance is essential for preventing disease introduction. Require hatchery workers to shower and change into dedicated clothing and boots before entering production areas. Provide footbaths with disinfectant at all entry points. Restrict visitor access and maintain a visitor log. Do not allow workers who own backyard poultry to enter the hatchery without a 48-hour quarantine period. ## Chick Quality Assessment Assess chick quality within 12 hours of hatch to identify and cull poor-quality chicks. Use both physical and behavioral criteria. ### Physical Criteria Examine chicks for the following characteristics: - Navel closure: The navel should be fully closed and dry. Open or wet navels indicate poor incubation conditions or infection. - Yolk sac absorption: The abdomen should be firm but not distended. Swollen abdomens suggest unabsorbed yolk sacs. - Leg and toe condition: Legs should be straight and toes should be fully formed. Splayed legs or curled toes indicate incubation problems or nutritional deficiencies. - Feathering: Chicks should have clean, dry down feathers. Wet or matted feathers suggest high humidity during hatch. - Eye condition: Eyes should be bright and open. Dull or closed eyes indicate dehydration or illness. ### Behavioral Criteria Observe chick behavior in the holding area: - Activity: Vigorous chicks are active and move around the basket. Lethargic chicks that remain still may be weak or ill. - Vocalization: Healthy chicks produce consistent, moderate vocalizations. Excessive or weak vocalizations indicate stress. - Righting reflex: Place chicks on their backs. Healthy chicks right themselves within 3 seconds. Delayed righting indicates weakness. Grade chicks into three categories: Grade A (pass all criteria), Grade B (minor defects but acceptable for sale), and Cull (severe defects or illness). Record the number of chicks in each grade for each breeder flock and incubation batch. ## Records and Measurements Maintain detailed records for each hatch cycle to track performance and identify problems. ### Essential Records Record the following data for each hatch: - Breeder flock identification and age - Number of eggs set - Egg storage duration and conditions - Incubator temperature and humidity readings (every 2 hours) - Egg weight loss at day 18 - Number of eggs transferred to hatcher - Hatch date and time - Number of chicks hatched - Number of culled chicks and reasons - Chick quality grades ### Performance Calculations Calculate these key performance indicators: - Hatchability: (Number of chicks hatched / Number of fertile eggs set) x 100 - Fertility: (Number of fertile eggs / Number of eggs set) x 100 - Hatch of fertile: (Number of chicks hatched / Number of fertile eggs) x 100 - Cull rate: (Number of culled chicks / Total chicks hatched) x 100 Compare these values against industry benchmarks and your own historical data. Investigate any values that fall outside acceptable ranges. ## Common Failure Patterns Hatchery managers should recognize common failure patterns and their likely causes. ### Low Hatchability Low hatchability can result from: - Poor fertility in the breeder flock - Extended egg storage beyond 10 days - Incorrect incubation temperature (too high or too low) - Inadequate humidity causing excessive moisture loss - Poor ventilation leading to high carbon dioxide levels - Microbial contamination of eggs or incubators Examine breakout analysis of unhatched eggs to determine the stage of embryonic mortality. Early mortality (days 1-7) often indicates egg storage problems or breeder flock issues. Mid-term mortality (days 8-14) suggests incubation temperature fluctuations. Late mortality (days 15-21) points to hatcher conditions or contamination. ### Poor Chick Quality Poor chick quality can result from: - Dehydration due to low humidity during hatch - Starvation due to delayed chick removal from hatcher - Infection from contaminated eggs or equipment - Incorrect incubation temperature causing abnormal development - Rough handling during chick processing Monitor chick quality trends over time. A sudden decline in quality may indicate an acute problem such as equipment failure or disease outbreak. ### Microbial Contamination Microbial contamination can cause omphalitis (yolk sac infection) and increased chick mortality. The study "Onsite investigation at a mail-order hatchery following a multistate Salmonella illness outbreak linked to live poultry-United States, 2018" ([Poultry Science](/knowledge/animal-farming/poultry/poultry-science-research-key-institutions-and-current-directions), 2019) highlights that hatchery contamination can lead to human illness outbreaks. Signs of contamination include: - Increased cull rate for open navels or infected yolk sacs - Foul odor in incubators or hatchers - Visible mold growth on eggshells or equipment - Elevated bacterial counts on environmental monitoring samples ## Welfare and Safety Context Chick welfare begins at the hatchery. Proper incubation conditions, gentle handling, and timely access to feed and water are essential for chick health and performance. ### Chick Welfare During Processing Process chicks as quickly as possible after hatch. Remove chicks from the hatcher within 12 hours of the majority hatching. Delayed removal leads to dehydration and starvation. Provide chicks with access to water within 2 hours of removal from the hatcher if they will be held for more than 12 hours before transport. Use automated chick processing equipment that minimizes handling stress. Train workers to handle chicks gently and avoid dropping or squeezing them. Monitor chick vocalization during processing as an indicator of stress. ### Worker Safety Hatchery workers face several occupational hazards: - Respiratory exposure to dust, mold spores, and disinfectant fumes - Musculoskeletal injuries from repetitive lifting and handling - Slip and fall hazards from wet floors - Zoonotic disease exposure from contaminated eggs and chicks Provide workers with appropriate personal protective equipment including respirators, gloves, and slip-resistant footwear. Train workers on safe lifting techniques and proper use of cleaning chemicals. Implement a worker health monitoring program that includes reporting of respiratory symptoms and gastrointestinal illness. ### Food Safety Considerations Hatchery practices affect food safety throughout the poultry production chain. The risk profile "Ceftiofur-resistant Salmonella enterica serovar Heidelberg of poultry origin" (Epidemiology and Infection, 2019) demonstrates that antimicrobial-resistant pathogens can originate in hatcheries and persist through the production cycle. Implement Salmonella control programs that include: - Routine environmental monitoring for Salmonella - Vaccination of breeder flocks - Sanitization of hatching eggs - Biosecurity protocols for hatchery personnel - Traceability systems for chicks shipped to farms ## Limitations and Professional Escalation Criteria Hatchery managers must recognize when problems exceed their ability to resolve and require professional assistance. ### When to Consult a Veterinarian Consult a poultry veterinarian when: - Hatchability drops more than 5% below your historical average for two consecutive hatches - Chick mortality exceeds 2% in the first 7 days after placement - You observe signs of infectious disease such as respiratory distress, diarrhea, or increased cull rate for omphalitis - Environmental monitoring detects Salmonella or other pathogens of regulatory concern ### When to Contact Equipment Manufacturers Contact equipment manufacturers when: - Incubator temperature or humidity readings deviate from set points by more than 1°F or 5% relative humidity - Ventilation systems fail or produce unusual noises - Automated egg turning or chick processing equipment malfunctions - You need calibration services for monitoring equipment ### When to Notify Regulatory Authorities Notify regulatory authorities when: - You suspect a reportable disease such as [avian influenza](/knowledge/bacteria/avian-bacteria/avian-influenza-cdc-global-surveillance) (contact USDA APHIS as referenced in their Avian Health information) - You receive a positive test result for Salmonella that may be linked to a human illness outbreak - You ship chicks that are later associated with a foodborne illness investigation ## Hatchery Waste Management and Disposal Protocols Hatchery operations generate substantial biological waste including eggshells, infertile eggs, dead embryos, unhatched eggs, chick down, and hatchery byproducts. Improper waste management creates biosecurity risks, attracts pests, produces odors, and may violate environmental regulations. The study "Current state of [poultry waste management](/knowledge/animal-farming/poultry/poultry-waste-management-sustainable-approaches-and-regulatory-compliance) practices in Bangladesh, environmental concerns, and future recommendations" (Journal of Advanced Veterinary and [Animal Research](/blog/guides/animal-research), 2022) documents that inadequate waste handling in poultry operations can lead to environmental contamination and disease spread. Hatchery managers must implement systematic waste management protocols that balance biosecurity, environmental compliance, and operational efficiency. ### Waste Segregation and Collection Schedule Segregate hatchery waste at the point of generation to prevent cross-contamination and simplify disposal. Establish separate collection containers for each waste category: - Eggshells and infertile eggs from candling and transfer operations - Dead embryos and unhatched eggs from hatcher trays - Chick down and dust from chick processing areas - Hatchery byproducts including chick sexing waste and culled chicks - Sanitation waste including used disinfectant containers and cleaning materials Collect waste at minimum every 4 hours during active hatchery operations. Use color-coded, lidded containers that are clearly labeled for each waste type. Empty and sanitize collection containers daily. Record the weight or volume of each waste category per hatch cycle to track waste generation rates and identify abnormal increases that may indicate processing problems. ### On-Site Waste Treatment Options Hatcheries have several options for on-site waste treatment before final disposal. The study "Effect of poultry litter amendment on hatchery waste composting" (Journal of Applied [Poultry Research](/knowledge/animal-farming/poultry/poultry-research-how-to-find-and-evaluate-scientific-studies), 2002) demonstrates that composting hatchery waste with poultry litter can produce stable, pathogen-free end products suitable for land application. #### Composting Composting is suitable for hatcheries with access to land and carbon-rich bulking materials. Mix hatchery waste with poultry litter, straw, or wood shavings at a ratio of 1 part waste to 3 parts bulking material by volume. Maintain moisture content at 40-60% and turn the pile weekly to ensure aerobic conditions. Monitor internal pile temperature daily, the pile should reach 130-150°F (55-65°C) for at least 3 consecutive days to kill pathogens. Record temperature readings, turning dates, and moisture adjustments. Composting requires 4-8 weeks for complete stabilization depending on ambient temperature and pile management. #### Incineration Incineration is appropriate for hatcheries that generate large volumes of waste or operate in areas with limited land for composting. Use approved incinerators that meet local air quality regulations. Operate incinerators at minimum 1500°F (815°C) to ensure complete combustion and pathogen destruction. Record incinerator operating temperature, waste load weight, and burn duration for each cycle. Ash disposal must comply with local solid waste regulations. #### Rendering Rendering involves transporting hatchery waste to a licensed rendering facility that processes animal byproducts into protein meals and fats. This option requires reliable cold storage on-site to prevent decomposition during accumulation. Maintain waste at 40°F (4°C) or below if holding exceeds 24 hours before pickup. Contract with a licensed renderer and maintain records of pickup dates, waste weights, and destination facility. ### Biosecurity Considerations for Waste Handling Waste handling areas must be physically separated from clean hatchery operations. The article "Biosecurity Compliance and Its Applications in Poultry Production Sectors" (Journal of World's Poultry Research, 2024) emphasizes that waste management zones should be located downwind and at least 100 feet from hatchery intake vents and personnel entrances. Designate specific personnel for waste handling duties who do not enter clean production areas on the same shift. Provide dedicated clothing, boots, and gloves for waste handlers. Require workers to shower and change before returning to production areas. Place footbaths with disinfectant at the entrance and exit of waste handling areas. Use dedicated equipment such as wheelbarrows, carts, and shovels for waste handling only. Clean and disinfect this equipment daily. Do not allow waste handling equipment to enter clean hatchery areas. ### Environmental Monitoring of Waste Areas Monitor waste storage and treatment areas for indicators of environmental contamination. The study "Salmonella Biomapping of a Commercial Broiler Hatchery" (Journal of Food Protection, 2024) demonstrates that hatchery waste areas can serve as reservoirs for Salmonella that may re-enter production areas through personnel or equipment movement. Conduct monthly environmental sampling of waste handling areas including floors, drains, container exteriors, and equipment surfaces. Test samples for total aerobic plate counts, coliforms, and Salmonella. Set action thresholds: investigate if total aerobic counts exceed 100,000 CFU per swab or if any Salmonella is detected. Document sampling locations, dates, and results. Monitor for pest activity in waste areas weekly. Record sightings of rodents, flies, or other pests. Implement pest control measures including bait stations, insect light traps, and exclusion repairs when pest activity is detected. ### Regulatory Compliance and Record Keeping Hatchery waste disposal must comply with local, state, and federal environmental regulations. The FAO Poultry Production and Products resource notes that waste management practices should protect water quality and prevent nuisance conditions. Maintain the following records for each waste disposal method: - Waste generation logs showing date, weight, and category of waste produced - Treatment records including composting temperatures, incinerator operating parameters, or rendering pickup receipts - Environmental monitoring results for waste handling areas - Pest control records including bait station inspections and treatment applications - Regulatory inspection reports and correspondence Retain records for minimum 3 years or as required by local regulations. Review waste management protocols annually and update based on regulatory changes, operational experience, or new research findings. ### Common Failure Patterns in Waste Management Hatchery managers should recognize common waste management failures and their consequences. #### Odor Complaints Odor problems typically result from waste accumulation beyond 24 hours, inadequate composting aeration, or improper moisture management. Address odor complaints by increasing collection frequency, improving composting pile turning schedules, or installing odor control systems such as biofilters or chemical scrubbers. #### Pest Infestation Rodent and fly infestations indicate inadequate waste containment or infrequent collection. Inspect waste containers for damage and replace cracked or corroded containers immediately. Increase collection frequency during warm weather when fly reproduction accelerates. Implement integrated pest management including exclusion, sanitation, and targeted pesticide application. #### Regulatory Violations Regulatory violations may result from improper waste disposal such as land application of uncomposted waste, discharge of hatchery wastewater without permits, or failure to maintain required records. Consult with environmental regulatory agencies before implementing new waste disposal methods. Document all regulatory communications and approvals. ### Professional Escalation Criteria for Waste Management Contact an environmental consultant or waste management specialist when: - You receive regulatory notices of violation related to waste disposal - Odor complaints from neighbors escalate to formal nuisance claims - You need to design or upgrade waste treatment facilities - Environmental monitoring detects contamination of groundwater or surface water near waste areas - You plan to implement new waste treatment technologies such as anaerobic digestion or advanced composting systems Contact a poultry veterinarian when waste management problems are linked to disease outbreaks. The study "Onsite investigation at a mail-order hatchery following a multistate Salmonella illness outbreak linked to live poultry-United States, 2018" (Poultry Science, 2019) demonstrates that inadequate waste management can contribute to pathogen persistence and human illness. ## Frequently Asked Questions ### What is the ideal temperature for storing hatching eggs? Store hatching eggs at 55-65°F (13-18°C) for eggs held less than 7 days. For longer storage up to 14 days, use 50-55°F (10-13°C). Maintain 75-80% relative humidity to prevent moisture loss. Turn eggs daily if storage exceeds 7 days. ### How often should I sanitize hatching eggs? Sanitize hatching eggs within 2 hours of collection. Use approved sanitizers such as formaldehyde gas, hydrogen peroxide, or quaternary ammonium compounds. Apply according to manufacturer label instructions and record the sanitizer type, concentration, and application method. ### What causes low hatchability in commercial hatcheries? Low hatchability can result from poor fertility, extended egg storage, incorrect incubation temperature, inadequate humidity, poor ventilation, or microbial contamination. Examine breakout analysis of unhatched eggs to determine the stage of embryonic mortality and identify the likely cause. ### How do I assess chick quality after hatch? Assess chick quality within 12 hours of hatch using physical criteria (navel closure, yolk sac absorption, leg and toe condition, feathering, eye condition) and behavioral criteria (activity, vocalization, righting reflex). Grade chicks into Grade A, Grade B, and Cull categories. ### What sanitation protocols should I follow between hatch cycles? Clean and disinfect incubators and hatchers between each hatch cycle. Remove all debris, wash with hot water and detergent, rinse, apply disinfectant, and allow surfaces to dry completely. Test cleaned surfaces for microbial contamination using contact plates or swabs. ### When should I consult a poultry veterinarian? Consult a poultry veterinarian when hatchability drops more than 5% below your historical average for two consecutive hatches, chick mortality exceeds 2% in the first 7 days after placement, you observe signs of infectious disease, or environmental monitoring detects Salmonella or other pathogens of regulatory concern. ### How can I prevent Salmonella contamination in my hatchery? Prevent Salmonella contamination through routine environmental monitoring, vaccination of breeder flocks, sanitization of hatching eggs, biosecurity protocols for hatchery personnel, and traceability systems for chicks shipped to farms. Implement a comprehensive Salmonella control program based on published research and regulatory guidance. ### What records should I maintain for each hatch cycle? Maintain records of breeder flock identification and age, number of eggs set, egg storage duration and conditions, incubator temperature and humidity readings, egg weight loss at day 18, number of eggs transferred to hatcher, hatch date and time, number of chicks hatched, number of culled chicks and reasons, and chick quality grades. ## Related Farming Guides - [Mycoplasma Management In Commercial Poultry](/knowledge/animal-farming/poultry/mycoplasma-management-in-commercial-poultry) - [Duck Egg Production And Nest Management](/knowledge/animal-farming/poultry/duck-egg-production-and-nest-management) - [Broiler Chicken Farming Flock Management From Placement To Processing](/knowledge/animal-farming/poultry/broiler-chicken-farming-flock-management-from-placement-to-processing) - [Broiler Litter Management](/knowledge/animal-farming/poultry/broiler-litter-management) - [Poultry Brooding Management For The First Two Weeks](/knowledge/animal-farming/poultry/poultry-brooding-management-for-the-first-two-weeks) ## Related Clinical & Scientific Guides * [Poultry Farm Fencing: Materials, Design, and Predator Exclusion](/knowledge/animal-farming/poultry/poultry-farm-fencing-materials-design-predator-exclusion) * [Broiler House Wind Speed and Airflow Measurement](/knowledge/animal-farming/poultry/broiler-house-wind-speed-airflow-measurement) * [Broiler House Heating Systems: Types and Efficiency](/knowledge/animal-farming/poultry/broiler-house-heating-systems-types-efficiency) ## References and Further Reading - [www.fao.org](https://www.fao.org/poultry-production-products/en) - [www.aphis.usda.gov](https://www.aphis.usda.gov/livestock-poultry-disease/avian) - [www.merckvetmanual.com](https://www.merckvetmanual.com/poultry) - [Current state of poultry waste management practices in Bangladesh, environmental concerns, and future recommendations.](https://pubmed.ncbi.nlm.nih.gov/36382043). Journal of advanced veterinary and animal research, 2022. - [Salmonella Biomapping of a Commercial Broiler Hatchery.](https://pubmed.ncbi.nlm.nih.gov/39151796). Journal of food protection, 2024. - [In ovo vaccination technology.](https://pubmed.ncbi.nlm.nih.gov/9890038). Advances in [veterinary medicine](/blog/careers/veterinary-medicine-careers-from-clinical-practice-to-public-health), 1999. - [Onsite investigation at a mail-order hatchery following a multistate Salmonella illness outbreak linked to live poultry-United States, 2018.](https://pubmed.ncbi.nlm.nih.gov/31579916). Poultry science, 2019. - [Effects of Sanitizers on Microbiological Control of Hatching Eggshells and Poultry Health during Embryogenesis and Early Stages after Hatching in the Last Decade.](https://pubmed.ncbi.nlm.nih.gov/36290211). Animals : an open access journal from MDPI, 2022. - [Ceftiofur-resistant Salmonella enterica serovar Heidelberg of poultry origin - a risk profile using the Codex framework.](https://pubmed.ncbi.nlm.nih.gov/31679543). Epidemiology and infection, 2019. - [Effect of poultry litter amendment on hatchery waste composting](https://doi.org/10.1093/japr/11.3.282). Journal of Applied Poultry Research, 2002. - [Poultry Production and Management](https://api.elsevier.com/content/abstract/scopus_id/105035051785). [Poultry Production and Management](/knowledge/animal-farming/poultry/poultry-production-records-essential-data-to-track-for-flock-management), 2025. - [Biosecurity Compliance and Its Applications in Poultry Production Sectors](https://doi.org/10.36380/jwpr.2024.33). Journal of World S Poultry Research, 2024. - [A model for promoting poultry industry development in Togo: Part 1. Management practices and incubation conditions](https://doi.org/10.3923/ijps.2014.176.184). International Journal of Poultry Science, 2014. - [Incorporation of phase change material (PCM) in poultry Hatchery for thermal management & energy conversion schemes of slaughterhouse waste in Broiler farms for energy conservation - A case study](https://doi.org/10.1109/ICEETS.2016.7583768). 2016 International Conference on Energy Efficient Technologies for Sustainability Iceets 2016, 2016. > This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.