One of the most important environmental elements in chicken farming is lighting, which has a significant impact on the welfare, development, behaviour, health, and reproduction of the birds. While bad lighting can cause hostility, decreased productivity, and welfare issues, good lighting encourages natural behaviour patterns and lowers stress. As a result, governments, trade associations, and animal welfare groups throughout the world have created and improved regulatory frameworks and welfare standards for poultry illumination.
The importance of poultry illumination is examined in this article, along with important regional regulations, best practices, and new developments that promote production and animal welfare.
Lighting's Significance in Poultry Production
Lighting in chicken houses has an impact on:
Circadian rhythms: Hormone synthesis, eating, and resting are all synchronised by light-dark cycles.
Growth and feed efficiency: Proper illumination promotes growth and feed intake, particularly in broilers.
Reproductive behaviour: Photoperiod and light intensity affect the generation of eggs and sexual maturity in layers and breeders.
Welfare indicators: Lighting conditions have an impact on behavioural issues such feather pecking, cannibalism, and stress-related reactions.
There are four primary adjustable properties of light:
Photoperiod (length of exposure to light)
The intensity of the light
Spectrum of light (colour or wavelength)
Technology of light sources (such as LED versus incandescent)
Regulations Concerning Lighting for Poultry
The Council Directive 2007/43/EC, which establishes basic requirements for the protection of grill chickens, is one of the most extensive pieces of animal welfare regulation in the European Union.
Important lighting features consist of:
Photoperiod: Continuous darkness for at least 4 hours, with at least 6 hours of darkness every 24-hour cycle.
Light intensity: During the light phase, a minimum of 20 lux must be supplied.
Light transitions: To lessen bird stress, light must be added gradually (to simulate dawn and nightfall).
Adaptation period: To aid with acclimatisation, chicks may be exposed to light for up to three days following placement.
The scientific studies that underpin the EU criteria bolster the notion that maintaining a suitable balance of light and dark cycles may maximise both avian wellbeing and production efficiency.
The lighting of chickens in commercial operations is not subject to any governmental regulations in the United States. Nonetheless, certification programs and industry associations give guidelines:
After the first week, the National Chicken Council (NCC) advises allowing 4 to 6 hours of darkness each day.
Layer hens must have a lighting schedule that encourages their natural behaviours, according to United Egg Producers (UEP), with cage-free systems requiring a minimum of eight hours of darkness.
Third-party certifications: Initiatives like as American Humane Certified, Global Animal Partnership (GAP), and Certified Humane impose more stringent guidelines, such as mandated dark times and certain light intensity limits (often 20 lux or more).
Voluntary standards are generally becoming more popular, particularly in organic and premium sectors.
The National Farm Animal Care Council (NFACC) created the Code of Practice for the Care and Handling of Hatching Eggs, Breeders, Chickens and Turkeys, which contains Canadian legislation.
Regarding broilers:
There must be at least four hours of darkness per 24 hours.
Birds should be able to see and interact with their environment in a normal way thanks to lighting.
It is advised to gradually alter the lighting to reduce stress.
Regarding layers:
Programs for lighting must reduce aggression and replicate the natural cycles of day and night.
Although they are widely accepted and regarded as best practices in the Canadian poultry business, these regulations are not legally binding.
These nations abide by the Poultry Code of Practice and state and territory-developed animal welfare regulations. Industry organisations follow similar rules as in the EU and North America, even if not all of them are legally binding.
For instance:
For broilers, a minimum dark time of four hours is advised.
In order to boost bird activity levels and lessen eye problems, light intensities greater than 20 lux are encouraged.
Strict light schedules are used by breeder flocks to control production and sexual development.
The Scientific Foundation of Lighting Regulations
Decades of scientific investigation have led to suggestions for lighting. Among the important conclusions are:
Light intensity: Less than 10 lux might cause ocular problems, lameness, and lethargy. Although higher levels (>20 lux) encourage natural activity, improper management may exacerbate aggressive behaviour.
Photoperiod: Constant illumination can speed up development, but it also increases mortality, causes foot pad dermatitis, and wears people out. Scheduled darkness enhances the immune system, lowers stress levels, and better suits the innate behaviour of birds.
Colour spectrum: Red, green, and blue light all affect chickens. Blue-green light may improve development and lessen hostility, whereas red light may encourage reproductive behaviour. However, using coloured illumination excessively might throw off circadian cycles.
LED technology: Energy-efficient LED systems that can be adjusted for time, colour, and intensity are used in modern chicken buildings. According to studies, birds that are illuminated by LEDs frequently exhibit higher feed conversion rates and welfare metrics.
Lighting Needs for Various Types of Poultry
Programs for broiler illumination seek to strike a compromise between welfare and quick development. Typical procedures consist of:
Initial light-to-dark ratio (23L:1D) for chick acclimatisation
After day 7, gradually go to 18L:6D or 16L:8D.
Twenty to thirty lux of light intensity
Dimmable LED lighting is used to avoid abrupt changes.
While layer chickens need darkness to recover and avoid cannibalism, they also need additional daylight hours to continue producing eggs.
Photoperiod: 8–10 hours of darkness and 14–16 hours of light
Ten to twenty lux is the intensity (greater levels may create hostility).
simulated changes from dawn to sunset
In order to regulate sexual maturation and egg laying, breeder flocks (parent stock) use more intricate lighting programs:
regulated exposure to light throughout the rearing phase (e.g., 8L:16D)
At maturity, gradually increase the number of light hours to encourage laying
It is possible to employ warm, red light to encourage mating behaviour.
Implementation Difficulties
Despite the advantages, there are a number of difficulties:
Retrofitting costs: It can be costly to install contemporary, dimmable, spectrum-adjustable LED systems.
Training: Farm labourers must receive instruction on how to use programmable lighting systems.
Monitoring compliance: It might be challenging to guarantee compliance in areas where lighting is not subject to regulatory regulations.
Variation by species and breed: Certain breeds may require customised programming due to their varying lighting requirements.
New Developments and Trends
Real-time lighting management and automation based on bird behaviour, time of day, and seasonal change is made possible by integration with the Internet of Things (IoT). Systems are able to:
Adapt the light to the degree of activity.
To lessen stress, make changes gradual.
Keep an eye on your energy usage.
Beyond length and intensity, new study investigates light quality, including:
Perception of flicker: Compared to humans, birds see flicker at higher frequencies. Welfare is enhanced by LED systems with reduced flicker rates.
UV inclusion: Certain lighting systems have UV-A light, which hens can sense and which enhances their behaviour and visual comprehension.
Simulating daylight: Birds' instincts are in line with simulating natural lighting patterns.
A growing number of producers are implementing best-in-class lighting schemes in an effort to get organic or humane-certified labels. This appeals to consumers who care about ethics in addition to promoting wellbeing.
Poultry production, welfare, and health are all significantly impacted by lighting. To guarantee that birds receive the right amount of light exposure, regulatory requirements and welfare guidelines offer crucial foundations. While some areas, like the EU, have strict regulatory criteria, others rely on certification programs run by the industry to promote advancements.
There are chances to customise lighting settings for various poultry species thanks to modern lighting technology, particularly LED systems and sophisticated controls. We should anticipate future improvements in laws and procedures as science continues to shed light on the relationship between illumination and bird behaviour.
Optimising lighting to balance animal welfare and production is no longer only a legal need; forward-thinking poultry farmers throughout the world have accepted this duty.
