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Dimension 1: Matching Ambient Temperature with Flock Temperature Requirements

There is an inherent link between the ventilation cycle and temperature management—the cycle with minimal stress and suitable temperature difference is the best cycle.

When the ambient temperature is suitable (spring and autumn or warm periods), as the flock ages, their oxygen demand increases, requiring a sufficient supply of fresh air in a short time. At this time, a large circulation (5-10 minutes) is recommended to ensure the fan has enough operating time to meet oxygen requirements.

When the ambient temperature is low (cold season), heat loss from the chicken house is rapid, but the flock’s temperature requirements change less, requiring longer shutdown times to reduce cold air intrusion. At this time, a maximum circulation (>10 minutes) is recommended, with short opening times and long closing times, ensuring minimum ventilation while maintaining a balanced house temperature.

💡 Core Principle: The circulation cycle should be dynamically adjusted according to the ambient temperature, lengthening in cold weather and shortening in warm weather.

Dimension 2: Chicken Age and Physiological Adaptability

Chicks of different ages exhibit significantly different tolerances to temperature changes:

Chicks under 1 week old: Their thermoregulatory center is not fully developed, making them extremely sensitive to environmental fluctuations. At this stage, a maximum circulation cycle (Cp > 10 minutes) is recommended, significantly extending the stop time to avoid frequent cold drafts and minimize the conflict between supply and demand for warmth.

As they grow older (after 2 weeks): Chickens’ adaptability increases, and the circulation cycle can be gradually shortened, transitioning to a normal large or small circulation cycle. This allows the flock to gradually adapt to temperature changes and enhances stress tolerance.

✅ This gradual adjustment from long to short cycles allows the flock to smoothly adapt to changes in ventilation rhythm during growth and development.

Dimension 3: Humidity Levels in the Chicken Coop

Excessive humidity not only breeds bacteria but also affects perceived temperature, necessitating timely dehumidification:

When rapid dehumidification is needed (e.g., in damp drinking areas during winter or on rainy days): Use a small circulation system (3-5 minutes), increasing the frequency of fan starts and stops to accelerate airflow and promote moisture evaporation.

For older chickens with higher oxygen requirements, a larger circulation system (5-10 minutes) can be used to increase the duration of each ventilation cycle, but this should be assessed in conjunction with the chicken’s age.

Dimension 4: Extremely Low Temperatures (Below Zero)

When the outside temperature suddenly drops below zero, heat loss from the chicken coop accelerates dramatically.

If a large circulation system is used at this time, prolonged downtime may cause a precipitous drop in temperature.

It is advisable to adjust to a small circulation system (3 minutes), shortening the downtime interval and frequently supplementing with small amounts of fresh air. This prevents drastic temperature fluctuations while ensuring a basic oxygen supply.

📌 Special Note: In extremely cold weather, operating a micro-circulation system for 2 minutes or even 1 minute is extremely difficult. Long-term use can easily lead to the flock catching cold and becoming ill. It is not recommended as a routine practice.

Dimension 5: Air Quality (Dust, Feed Particles)

As chickens age, the amount of dust and feed particles suspended in the air due to feeding and activity increases, severely irritating the respiratory system.

When air quality deteriorates, a large-scale air circulation system (5-10 minutes) should be implemented to increase the duration of each ventilation cycle, ensuring sufficient time to completely remove suspended particles from the shed and reduce damage to the trachea and lungs.

While misting can be used to reduce dust, increasing ventilation duration is the fundamental solution.

Dimension 6: Concentration of Harmful Gases (Ammonia, Hydrogen Sulfide, etc.)

Elevated concentrations of harmful gases (especially ammonia) can damage the conjunctiva of the eyes and the respiratory mucosa, inducing respiratory diseases.

Once a distinct ammonia odor is detected or the detector alarms, immediately switch to a large-circulation system, extending the fan’s operating time to accelerate the dilution and removal of harmful gases.

Short-cycle ventilation is not recommended at this time (frequent start-stop cycles actually reduce ventilation efficiency); a large-circulation system provides stronger continuous exhaust capacity.

Dimension 7: Specific Immune Stress Points

Immunization procedures can exacerbate stress in chickens, requiring targeted adjustments to ventilation strategies:

After administering oil-based vaccines (AI, IC, RA, etc.): Vaccine stimulation easily induces a fever response in the body. In this case, the pause time should be increased (using maximum or large circulation) to reduce cold air stimulation and avoid exacerbating the combined effects of heat stress and the immune response.

After ILT (Infectious Laryngotracheitis) immunization: Chickens experience upper respiratory tract discomfort and increased oxygen demand. Ventilation time should be appropriately increased (using large circulation) to provide ample fresh air and alleviate respiratory discomfort.

⚠️ Closely observe the flock’s condition within 48 hours after immunization and adjust circulation parameters flexibly.