Understanding Heat Stress in Chickens

Heat stress is a serious concern that can severely impact the health and productivity of chickens in the summer months. As a responsible poultry keeper, understanding the causes, signs, and preventative measures of heat stress in chickens is essential to ensure the well-being of your birds, even on the hottest days. In this blog, you’ll learn all about heat stress and what you can do to keep your flock cool this summer.

What is Heat Stress?
Heat stress occurs when a chicken’s body temperature exceeds the normal range of 105°F to 107°F, which puts excessive stress on the chicken’s body systems. As the body temperature rises, this pressure increases which can lead to organ damage, decreased egg production and potentially death. Several factors can affect a chicken’s tolerance to heat, including age, breed, genetics, and whether or not preventative measures have been taken to avoid heat stress.

Causes of Heat Stress in Chickens:
While we know that rising body temperatures cause it, there are several factors that may cause heat stress in chickens:

• High ambient temperatures
• High humidity levels
• Poor coop ventilation
• Overcrowding
• Lack of shaded areas
• Lack of water access
• Age & breed of birds

What Are the Symptoms of Heat Stress in Chickens?
Knowing the signs and symptoms of heat stress is crucial to prevent illness and potential death in your flock. Let’s take a look at some of the telltale symptoms to watch for:
Panting & Rapid Breathing—During heat stress, chickens may exhibit rapid, open-mouth breathing in an attempt to dissipate internal heat.
Pale Comb & Wattles—Since the comb and wattles are the only parts of a chicken’s body that have direct skin-to-air access, extra body heat can escape through them, making the skin appear shriveled and pale.
Outspread & Drooping Wings—Holding their wings away from their body in a drooped position allows more airflow to their skin, releasing trapped heat through evaporative cooling.
Seeking Shade & Prolonged Resting—Most activity generates heat, so your chickens may seek a shady spot to rest during hot weather. You may notice them spending less time roaming and more time lying down and resting, and this is because they are trying to reduce heat production and conserve what little energy they may have. If your chickens become lethargic and aren’t moving, this may indicate that heat stress has progressed to heat stroke and immediate action must be taken.
Eating Less, Drinking More—Since bodily processes like eating and digestion generate heat through metabolic heat production, you may find that your chickens eat less during hot weather. However, they may increase their water intake by 2-4 times their normal amount when they are hot, as drinking cool water helps cool them down from the inside out.
Decreased Egg Production—High temperatures can take a toll on the reproductive function of hens, and they may stop laying eggs if their bodies experience heat stress. Additionally, because eggs are mostly made up of water, a dehydrated, heat-stressed hen won’t have enough body moisture to keep producing eggs.
Diarrhea—Heat stress can disrupt digestive processes in chickens due to reduced feed digestion and electrolyte imbalances. This can result in diarrhea, which may cause your chicken to become dehydrated from moisture loss in the body.
Increased Vocalization—Chickens in distress from heat stress may become more vocal as they try to express their discomfort and seek relief from the heat.

How to Prevent Heat Stress in Chickens:
Knowing how to prevent heat stress and being proactive in preparing for hot weather is imperative to the health and productivity of your flock during the summer months. By implementing these preventative measures, you could save your feathered friends’ lives!
Provide Lots of Water—Offer fresh, cool water to your chickens at all times and allow them to drink it freely. Try to place waterers in shady spots. You can even add a few ice cubes to the water to keep it cool for your flock. Just be careful not to add too many, as icy cold water may be a shock to the body of a hot chicken. Pick up some extra chicken waterers at your local Feeds’n Needs!
*Bonus—Offer cold treats to your chickens on hot days! Things like cold watermelon slices, ice cube treats with fruits and vegetables, or adding tasty snacks like peas or dried mealworms to a bowl of cold water are great ways to help your chickens keep cool and encourage them to stay hydrated.
Supplement Electrolytes—When chickens experience intense heat, their electrolyte levels can become imbalanced. Electrolytes are essential to maintaining normal bodily functions and hydration. On hot days, add a water-soluble electrolyte supplement such as Electrovite or Stress ADE to your chicken’s water to help maintain healthy electrolyte levels. Find these supplements and more at Feeds’n Needs.
Avoid Overcrowding—When many chickens are kept together in a crowded space, their body temperature is elevated by the temperatures of all the birds around them. This is why it is important to make sure that you can provide your chickens with lots of space, especially on hot days. If having them free range isn’t an option, ensure your coop or run allows 8 square feet per bird to prevent overcrowding.
Proper Coop Ventilation—Ensuring your coop is well ventilated to allow lots of airflow is important, especially on hot days when heat stress is a concern. When ventilating your coop, keep predator safety in mind and make sure no predators can get to your flock. If you are able to run electricity to your coop, consider setting up a fan to give your chickens an extra cool breeze!
Provide Shade & Cooling Measures—Make sure your chickens have access to shady areas to rest and relax on hot days! Whether it be natural shade sources like trees and shrubs or man-made shade sources like awnings or a tarp strung up over the run, your chickens will appreciate having a place to rest away from direct sunlight. Additionally, implement cooling measures like shallow pools of water or misters around the yard for your flock to take advantage of in the heat!
Adjust Their Feeding Schedule—Since eating and the whole digestion process generates heat, consider feeding your chickens in the morning and evening when the temperatures may be a bit lower.
Provide Dust Baths—Dust bathing keeps chickens’ feathers clean and healthy and helps them regulate their body temperature by kicking cool soil onto their skin. On hot days, provide your chickens with dust baths in shaded areas; they’ll definitely appreciate it!
Monitor Environmental Conditions and Chicken’s Behavior—By monitoring the outdoor temperature and humidity levels, you will be better prepared to implement heat stress preventative measures for your flock when necessary. Additionally, closely monitoring your chickens for signs and symptoms that may indicate heat stress and jumping into action if needed could save the lives of your birds!

Now that you have learned all about heat stress in chickens, you should be well equipped to take the proper precautions to prevent your flock from suffering in the heat. Drop by your local Feeds’n Needs store to stock up on emergency supplies like extra waterers and electrolyte supplements so you and your chickens will be well prepared for the next heat wave!

Looking for more poultry-related content? Check out our other posts!
How to Introduce New Chickens to Your Flock
Hens’ Health Throughout the Seasons
Predator Proofing Your Chicken Coop

Sources:
Chicken Heat Stress Signs, Symptoms and Prevention  – Backyard Boost
Chickens & Heat Stress: How to Identify, Prevent, & Treat (grubblyfarms.com)