How do you keep chickens cool in extreme heat?

Heat stress in chickens starts at just 27°C — discover how ventilation, electrolytes, and betaine prevent production losses.

Keeping chickens cool in extreme heat requires maximizing ventilation, ensuring constant access to drinking water, and adjusting nutrition with substances that reduce heat stress. Poultry is more sensitive to high temperatures than many other animals, because chickens cannot sweat and rely heavily on panting to regulate their body temperature. In this article, we answer the most frequently asked questions about heat stress in chickens, from early warning signs to concrete prevention strategies.

What are the signs of heat stress in chickens?

Heat stress in chickens can be recognized by rapid, shallow breathing with an open beak, reduced feed intake, increased water consumption, and visibly lethargic behavior. In severe cases of heat stress, chickens stand with their wings spread, actively seek out shade, and egg or meat production can drop noticeably.

The first signs are subtle but important to recognize early. Chickens begin to pant when their body temperature rises above normal levels. At the same time, feed intake decreases while water consumption increases sharply. This has direct consequences: less feed means fewer nutrients, putting pressure on growth and production.

In laying hens, heat stress also manifests as thinner eggshells and a declining laying frequency. In broilers, it shows up as slower weight gain and a deteriorating feed conversion ratio. The sooner you intervene, the more limited the damage will be.

At what temperature do chickens suffer from heat?

Chickens begin to experience heat stress at around 25 to 27 degrees Celsius, depending on humidity levels and the type of chicken. Above 30 degrees Celsius, the risk of production losses increases significantly, and above 35 degrees, heat stress can become life-threatening for the flock.

The combination of temperature and humidity determines the actual heat sensitivity. High humidity makes panting less effective, reducing the chickens’ ability to cool down efficiently. Heavy broilers and high-producing laying hens are more susceptible than lighter breeds, because their metabolism generates more heat.

Poultry farmers operating internationally in warm climates — such as the Middle East or Southeast Asia — structurally face temperatures well above these thresholds. In those conditions, a proactive approach is not a luxury but a necessity to maintain technical performance.

How do you improve ventilation in a poultry house during heat?

Ventilation in a poultry house can be improved during heat by using tunnel ventilation, positioning fans strategically, and actively monitoring barn temperature. Good airflow lowers the perceived temperature for the chickens and speeds up the removal of heat, moisture, and harmful gases.

Practical measures to optimize ventilation:

Activate tunnel ventilation: Ensure a constant airflow from front to back through the barn, so that the perceived temperature drops noticeably.
Check fans: Verify that all fans are functioning correctly and are clean, as clogged fans lose significant efficiency.
Use evaporative cooling pads or misting systems: In dry, hot weather, evaporative coolers effectively lower the temperature of incoming air.
Monitor barn temperature: Use multiple temperature sensors at different locations throughout the barn to detect hot spots.
Adjust stocking density: Higher stocking density means more heat production per square meter. Consider temporarily reducing stocking density during extreme heat.

Ventilation alone does not always fully solve the problem. It is the foundation on which other measures — such as nutritional and drinking water adjustments — are built.

What should you give chickens to drink during extreme heat?

During extreme heat, chickens must always have access to fresh, clean drinking water. Preferably add electrolytes or supportive substances such as vitamin C and betaine to the drinking water, as these improve hydration and support the physiological stress response.

Water intake can double or even triple in heat compared to normal conditions. Make sure the water pressure and capacity of the drinking water system are adjusted accordingly. Cooler water is absorbed more readily, so insulating water pipes or topping up with cold water during the hottest hours of the day makes a real difference.

Drinking water is also an excellent delivery vehicle for supportive products, precisely because chickens drink more than they eat when under stress. Water intake is more reliable than feed intake during heat, meaning you can guarantee the correct dose is administered through the drinking water. Products such as vitamin C and betaine via drinking water offer a practical and effective solution in these circumstances.

Do not overlook hygiene either: warm and stagnant water in pipes promotes bacterial growth. Clean drinking water lines regularly and use products to maintain water quality where necessary.

What nutritional adjustments help chickens during heat stress?

During heat stress, nutritional adjustments that reduce metabolic heat production, improve cellular hydration, and maintain nutrient intake are beneficial. Betaine is a scientifically well-supported choice in this regard, as it acts as an osmolyte that protects cells against dehydration and reduces oxidative stress.

Concrete nutritional adjustments poultry farmers can implement:

Add betaine to feed or drinking water: Betaine acts as an osmolyte and protects cells during heat stress. Studies show that betaine improves breast muscle yield through better cellular hydration and antioxidant protection, even at high temperatures.
Adjust feeding times: Provide the largest portion of the daily ration during the cooler morning and evening hours. Digestion generates heat, so feeding during the hottest hours of the day increases the heat stress burden.
Increase energy density: Because feed intake drops during heat, you can increase the energy density of the ration so that chickens still receive sufficient energy from a smaller amount of feed.
Supplement vitamin C: Heat stress increases the need for antioxidants. Vitamin C supports the immune system and reduces the physiological stress response.
Replenish electrolytes: Excessive panting causes chickens to lose sodium, potassium, and chloride. Replenishing these through drinking water helps restore electrolyte balance.

More information on how betaine works as an osmolyte and methyl donor can be found in our comprehensive product information. The role of betaine extends beyond heat stress alone: it also supports gut integrity and carcass quality in broilers.

How do you prevent heat stress in chickens next season?

Preventing heat stress in chickens next season starts now — by investing in barn infrastructure, establishing a preventive nutrition protocol, and having the right products on hand before the heat wave arrives. Preparation is more effective than crisis management.

Begin with a technical barn inspection before the warm season: check ventilation systems, insulate water pipes, test cooling systems, and ensure temperature sensors are properly calibrated. A well-functioning infrastructure is the first line of defense.

In addition, establish a preventive nutrition protocol. Betaine can be used preventively as temperatures begin to rise, so that the chickens’ cells are already optimally hydrated when the real heat arrives. This is more effective than waiting to intervene until production has already declined.

Work with your supplier or nutritionist to develop a summer strategy tailored to your flock, breed, and climate. An approach that works in Northern Europe requires adaptation for warm climates in the Middle East or Asia. International drinking water and feed additives can play a structural role in this.

How Jodoco helps with heat stress in poultry

At Jodoco, we have developed a dedicated portfolio for poultry farmers who want to address heat stress in a structural way, built on years of scientific research and practical experience. Our solutions combine multiple mechanisms of action in a single formula, enabling you to achieve the best results with a targeted approach.

What we offer for chickens in heat:

Jodobet: Natural betaine as an osmolyte and methyl donor, proven effective in reducing heat stress, improving gut health, and increasing breast muscle yield in broilers.
Jodoplume: A liquid combination of betaine, organic acids, and copper for administration via drinking water, ideal during heat or coccidiosis stress.
Pure C Beta: Vitamin C combined with betaine for enhanced immunity, optimal hydration, and metabolic support during heat stress.
Grovax: Organic acids, butyrate, MCFA, and essential oils for gut health and technical performance, even under challenging conditions.

Our products are developed in our own laboratories and tested in collaboration with national and international research institutions. We are happy to think along with you about a tailored approach for your operation. Contact us and discover which solution best suits your flock and climate.