{"id":14134,"date":"2017-05-25T00:00:00","date_gmt":"2017-05-24T22:00:00","guid":{"rendered":"https:\/\/termo.gbsweb.online\/heat-stress-in-poultry\/"},"modified":"2025-11-18T15:39:20","modified_gmt":"2025-11-18T14:39:20","slug":"heat-stress-in-poultry","status":"publish","type":"post","link":"https:\/\/www.pericoli.com\/en\/heat-stress-in-poultry\/","title":{"rendered":"Heat stress in poultry: what is, causes, effects &#038; implementing solutions"},"content":{"rendered":"<p><strong>Heat stress in poultry <\/strong>is a serious issue which can <strong>deeply significantly reduce productivity<\/strong>: when temperatures become excessively high temperatures, the impact on animals is evident, often resulting in a significant increase in mortality rates, and reducing conversion rate<\/p>\n<p>However, even when temperatures don\u2019t reach excessively critical peaks, but remain within the typical range<strong> of summer months, losses in egg production<\/strong> and signs of distress in the flock nevertheless occur.<\/p>\n<p>It is essential to gain a deep understanding of this issue in order to grasp how it affects costs, how to identify the symptoms in a timely manner, how to handle poultry heat stress management, and how to choose the <a href=\"https:\/\/www.pericoli.com\/en\/air-conditioning-for-livestock-farming-fields-of-application\/ventilation-and-cooling-system-poultry\/\">right ventilation solutions<\/a>.<\/p>\n<p>&nbsp;<\/p>\n<h2>What is heat stress in poultry and why is it a growing concern?<\/h2>\n<p><strong>Heat stress in poultry<\/strong> occurs when birds are no longer able to effectively dissipate excess body heat due to unfavorable environmental conditions.<\/p>\n<p>This phenomenon is closely linked to the <strong>concept of the thermoneutral zone<\/strong>: the range of ambient temperature, typically between 11\u00b0C and 26\u00b0C, within which chickens can maintain a stable body temperature without additional metabolic effort.<\/p>\n<p><strong>Heat stress in poultry is becoming an increasingly pressing global concern<\/strong> for several reasons. Firstly, <strong>climate change <\/strong>has intensified the frequency and duration of <strong>heat waves<\/strong>. Additionally, rising humidity levels reduce the efficiency of <a href=\"https:\/\/www.pericoli.com\/en\/wind-chill-effect-what-it-is-and-how-to-calculate-it\/\">body heat dissipation<\/a>, making the environment even more unfavorable for poultry.<\/p>\n<p>This issue is particularly critical in regions already exposed to high temperatures and intensive poultry farming, where facilities often lack adequate ventilation, such as in India.<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>Identifying the signs: key symptoms of heat stress in poultry<\/strong><\/h2>\n<p>Timely identification of <strong>heat stress symptoms in poultry<\/strong> is crucial to enable prompt intervention and limit the consequences on animal welfare and productivity.<\/p>\n<p><strong>Symptoms <\/strong>show at both behavioural and physiological levels. The most common signs include:<\/p>\n<ul>\n<li>Panting with an open beak;<\/li>\n<li>Outstretched wings to increase heat dissipation surface area;<\/li>\n<li>Lethargy and reduced physical activity;<\/li>\n<li>Crowding near water sources or cooler areas;<\/li>\n<li>Increased water consumption;<\/li>\n<li>Reduced feed intake;<\/li>\n<li>Ruffled feathers and abnormal posture;<\/li>\n<li>Fixed gaze or closed eyes;<\/li>\n<li>Drop in production (egg laying, weight gain);<\/li>\n<li>Increased mortality rate in severe or prolonged cases.<\/li>\n<\/ul>\n<p>For poultry farmers, it is essential to <strong>observe bird behaviour closely<\/strong>, especially during the hottest hours of the day, <strong>to identify the smallest deviations from normal patterns. <\/strong>The use of environmental sensors to monitor temperature and humidity levels can support early diagnosis.<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>The hidden costs: understanding the impact on poultry health and performance<\/strong><\/h2>\n<p><strong>Heat stress<\/strong>, by negatively impacting birds\u2019 welfare, directly affects productivity, farm efficiency, and profitability, ultimately resulting in tangible economic losses.<\/p>\n<p>Damage may develop progressively or appear suddenly impacting several physiological and productive aspects that are often interrelated.<\/p>\n<h3><strong>Oxidative stress and its economic consequences<\/strong><\/h3>\n<p>Prolonged exposition to high temperatures can lead to an imbalance between the production of free radicals and the body&#8217;s antioxidant capacity, resulting in what is known as oxidative stress.<\/p>\n<p>This condition compromises cellular integrity and can damage vital organs, muscles, and tissues, leading to impaired performance and increased disease risk. In broiler chickens, it translates into lower slaughter yield and reduced carcass quality.<\/p>\n<h3><strong>Gut health and productivity loss<\/strong><\/h3>\n<p>Heat stress also negatively affects gut health, altering the permeability of the intestinal barrier and causing dysbiosis, conditions that impair nutrient absorption, trigger inflammatory responses and increase susceptibility to enteric infections.<\/p>\n<p>The consequences include a deterioration of the feed conversion index, reduced growth performance, and a greater need for therapeutic interventions. The associated costs of supplements and treatments significantly contribute to rising management expenses.<\/p>\n<h3>Feed intake and growth rate<\/h3>\n<p>There is a <strong>negative<\/strong> <strong>relationship between temperatures and the amount of feed eaten<\/strong>. The reduced intake of energy is often associated with a limited growth.<\/p>\n<p>When birds are under heat stress<strong>, their bodies react with a feed reduction<\/strong>.<\/p>\n<p class=\"p1\">When feed intake is reduced, the availability of metabolic substrates and energy for metabolic processes also decreases, resulting in lower heat production.<\/p>\n<h3>Eggs production<\/h3>\n<p>Some studies show that eggs production has been <strong>reduced by up to 8% when temperatures rise from 21\u00b0C to 32\u00b0C.<\/strong><\/p>\n<p>In the specific case of laying hens, the physiological data we registered in condition of heat stress have a particular importance in the egg quality parameters: on the one hand, <strong>egg size decreases<\/strong>; on the other, <strong>both shell thickness and strength (internally and externally) are also negatively affected<\/strong>.<\/p>\n<h3>Male fertility<\/h3>\n<p>A study was conducted to examine the effect of high temperatures on male chicken fertility: <strong>semen volume was reduced by 50% <\/strong>compared to males kept to 21\u00b0C.<\/p>\n<p class=\"p1\"><strong>Fertility also decreased by 28% under heat stress<\/strong>, highlighting the importance of mitigating heat stress in males, particularly during the breeding season.<\/p>\n<h3>Carcass quality<\/h3>\n<p>Long exposure to heat stress (33\u00b0C) may <strong>lead to a tearing of the skin during the process of defeathering<\/strong>.<\/p>\n<p>Other problems, such as <strong>blood<\/strong> <strong>retention in the carcass, muscle stiffness, and dark pigmentation<\/strong> may also arise from exposure to heat stress prior to slaughter.<\/p>\n<p>These problems are more prevalent in females than in males, this explains why female carcasses are in many cases of low quality during the hottest months of the year.<\/p>\n<p>Furthermore, the physical changes occurring in the carcass under <strong>heat stress can also affect the chemical composition of meat <\/strong>with particular reference to protein and fat.<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>Poultry heat stress management: the crucial role of ventilation and cooling systems<\/strong><\/h2>\n<p><strong>The effects of poor ventilation in poultry <\/strong>are among the leading environmental causes of thermal discomfort and performance decline in intensive poultry farming.<\/p>\n<p>Inadequate or poorly distributed airflow results in the accumulation of heat, humidity, and harmful gases, such as ammonia and carbon dioxide, compromising air quality inside of the poultry house.<\/p>\n<p>This deterioration of the microclimate makes it harder for birds to dissipate body heat, increasing \u00a0the risk of heat stress, respiratory diseases, and even mortality, with significant economic consequences for the poultry farmer.<\/p>\n<p>For this reason, effective poultry heat stress management is one of the most important strategies <strong>to prevent the above-mentioned issues<\/strong>.<\/p>\n<p>The basic principles of an efficient ventilation to consider are:<\/p>\n<ul>\n<li>Continuous air exchange, to keep humidity and temperature under control and reduce the concentration of ammonia and carbon dioxide.<\/li>\n<li>Proper airspeed, to promote body heat loss by convection, especially durin ghte hottest hours of the day.<\/li>\n<li>Even airflow distribution, avoiding areas of excessive stagnation or excessive drafts.<\/li>\n<\/ul>\n<p><strong>\u00a0<\/strong><strong>Cooling systems play a crucial role<\/strong>, especially during heat peaks. The most widely used technologies include <strong>exhaust fans, air circulation fans, and evaporative cooling panels.<\/strong><\/p>\n<p><strong>\u00a0<\/strong>Properly managing ventilation and cooling helps maintain environmental conditions within the thermoneutral zone, reducing animal stress and preventing performance losses.<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>Leveraging advanced ventilation for effective heat stress mitigation<\/strong><\/h2>\n<p>Among the most effective tools are <strong>high performance<\/strong> <strong>exhaust fans<\/strong>, designed to ensure a continuous and controlled air exchange within poultry farms.<\/p>\n<p>These systems, developed with <strong>a strong focus on energy efficiency<\/strong>, <strong>help maintain optimal environmental conditions<\/strong> by reducing heat buildup and improving overall air quality.<\/p>\n<p><strong>Air circulation fans<\/strong>\u00a0 available in various models and sizes, include both standard wall-mounted versions, and cone-shaped configurations. They are designed to<strong> circulate air evenly throughout the poultry house<\/strong>, promoting body heat dispersion and enhancing the efficiency of ventilation and cooling systems.<\/p>\n<p>Completing the setup is the <strong>evaporative cooling panel<\/strong>, which operates on the principle of adiabatic cooling. This technology offers a simple yet highly effective solution for reducing the temperature of incoming air. Made with durable materials and manufactured using advanced automation, <strong>evaporative cooling panels <\/strong>combine <strong>reliability, user-friendliness, and low operating costs<\/strong>, making them especially suitable for large-scale poultry environments.<\/p>\n<p>The integration of these systems enables precise control of environmental conditions and supports the most effective <a href=\"https:\/\/www.pericoli.com\/en\/air-conditioning-for-livestock-farming-fields-of-application\/ventilation-and-cooling-system-poultry\/\">strategies for preventing heat stress in poultry<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Heat stress in poultry is a serious issue which can deeply significantly reduce productivity: when temperatures become excessively high temperatures, the impact on animals is evident, often resulting in a significant increase in mortality rates, and reducing conversion rate However, even when temperatures don\u2019t reach excessively critical peaks, but remain within the typical range of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":14135,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[18],"tags":[89,91],"class_list":["post-14134","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-termotecnica-pericoli","tag-all-about-cooling-systems","tag-all-about-ventilation-systems"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Heat stress in poultry: What is, causes, &amp; 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