{"id":10815,"date":"2026-06-14T06:00:00","date_gmt":"2026-06-14T06:00:00","guid":{"rendered":"https:\/\/jodoco.com\/?p=10815"},"modified":"2026-05-18T14:43:39","modified_gmt":"2026-05-18T14:43:39","slug":"which-chicken-breeds-are-most-heat-resistant","status":"publish","type":"post","link":"https:\/\/jodoco.com\/en\/which-chicken-breeds-are-most-heat-resistant\/","title":{"rendered":"Which chicken breeds are the most heat-tolerant?"},"content":{"rendered":"<p>The most heat-tolerant poultry breeds are lighter, Mediterranean breeds such as the Leghorn, the Naked Neck (also known as Turkens), and crossbreeds specifically selected for heat tolerance. These breeds combine efficient heat dissipation through their skin and comb with a lower metabolic intensity, allowing them to function better at high ambient temperatures. In this article, we answer the most frequently asked questions about <strong>heat-tolerant poultry breeds<\/strong>, the impact of heat stress on production, and how nutrition can make a difference.<\/p>\n<h2>What characteristics make a poultry breed heat-tolerant?<\/h2>\n<p>A poultry breed is heat-tolerant when it possesses physiological traits that promote heat dissipation and keep internal body temperature stable. The most important characteristics are a large comb and wattles, minimal feathering on certain parts of the body, lower body weight, and more efficient respiration at high temperatures.<\/p>\n<p>Heat dissipation in poultry occurs largely through evaporation and radiant exchange. Breeds with large, well-vascularized combs can release more heat through the skin. Breeds with fewer feathers on the neck or abdomen, such as the Naked Neck, lose up to 30% of their body surface area in feather coverage, which significantly improves heat dissipation.<\/p>\n<p>In addition, the following characteristics play a role:<\/p>\n<ul>\n<li><strong>Low body weight:<\/strong> Lighter animals produce less metabolic heat and are therefore better able to withstand high ambient temperatures.<\/li>\n<li><strong>Flexible feed intake in heat:<\/strong> Breeds that adjust their feed intake flexibly avoid excessive heat production through digestion.<\/li>\n<li><strong>Efficient water balance:<\/strong> Heat-tolerant breeds regulate their water intake more effectively and maintain a more stable electrolyte balance under stress.<\/li>\n<li><strong>Genetic osmoregulation:<\/strong> Some breeds naturally possess stronger cellular protection against osmotic stress, which maintains gut integrity and cell hydration.<\/li>\n<\/ul>\n<h2>Which poultry breeds tolerate high temperatures best?<\/h2>\n<p>The heat-tolerant poultry breeds that perform best at high temperatures are the Leghorn, the Naked Neck, the Rhode Island Red, and locally adapted breeds from tropical regions. These breeds have been genetically selected for efficient heat regulation and better maintain their productivity as temperatures rise.<\/p>\n<h3>Leghorn and Mediterranean laying breeds<\/h3>\n<p>The Leghorn is one of the most extensively studied heat-tolerant breeds. As a lightweight laying breed with a large comb and little body fat, it quickly adapts its metabolism in response to heat. Leghorns maintain egg production and eggshell strength better during heat waves than heavier hybrid breeds.<\/p>\n<h3>Naked Neck and tropical breeds<\/h3>\n<p>The Naked Neck breed, with its unfeathered neck, has a significant advantage at high ambient temperatures. Crossbreeds carrying Naked Neck genes are used worldwide in warm climates, particularly in Southeast Asia and the Middle East. Local breeds from these regions have been adapted to extreme heat through centuries of selection and have a higher baseline resistance to heat stress.<\/p>\n<h2>How does heat stress affect poultry production?<\/h2>\n<p>Heat stress in poultry leads to a direct decline in feed intake, growth rate, and egg production. When ambient temperature rises above the animal&#8217;s comfort range, the body redirects energy from growth and production toward thermoregulation, resulting in measurable production losses.<\/p>\n<p>In broilers, heat stress results in lower average daily gain, a deteriorated feed conversion ratio, and reduced breast muscle weight. Gut integrity declines as epithelial cells shrink under thermal stress, impairing nutrient absorption and increasing the risk of secondary infections.<\/p>\n<p>In laying hens, the consequences are equally significant:<\/p>\n<ol>\n<li><strong>Lower egg production:<\/strong> Hens reduce their feed intake, decreasing the energy available for egg formation.<\/li>\n<li><strong>Weaker eggshells:<\/strong> Heat stress disrupts calcium metabolism, leading to thinner and more brittle shells, particularly in older flocks.<\/li>\n<li><strong>Increased mortality:<\/strong> Severe or prolonged heat stress raises mortality rates, especially in heavier breeds and poorly ventilated housing.<\/li>\n<li><strong>Impaired liver function:<\/strong> Fat metabolism is disrupted, negatively affecting the overall condition and laying persistence of the hen.<\/li>\n<\/ol>\n<p>Beyond production losses, heat stress also affects end-product quality. Research published in the <em>Journal of Thermal Biology<\/em> (Elsherbeni et al., 2025) shows that heat stress negatively impacts breast muscle weight through reduced cellular hydration and increased oxidative stress.<\/p>\n<h2>What is the difference between genetic heat tolerance and heat resistance?<\/h2>\n<p>Genetic heat tolerance refers to a breed&#8217;s ability to maintain normal physiological functions at high temperatures, while heat resistance is the ability to withstand or recover from heat damage after a threshold has been exceeded. The two terms are often used interchangeably, but they describe different aspects of heat adaptation.<\/p>\n<p>A heat-tolerant breed like the Leghorn continues to produce normally at high temperatures because its metabolism naturally generates less heat and its body cools more efficiently. Heat resistance is more of a reactive trait: it describes how quickly and completely an animal recovers from a period of heat stress, such as after a heat wave.<\/p>\n<p>In practice, the distinction is relevant for breeding decisions. Breeders selecting breeds for warm climates ideally target both traits: a breed that not only performs well in the heat, but also recovers quickly when conditions temporarily worsen. Modern commercial hybrid breeds are primarily selected for maximum production under optimal conditions, which structurally reduces their heat tolerance compared to traditional, climate-adapted breeds.<\/p>\n<h2>How can nutrition reduce heat stress in poultry?<\/h2>\n<p>Nutrition can significantly reduce heat stress in poultry by supporting cellular water balance, protecting gut integrity, and lowering metabolic heat production. The most effective nutritional strategies combine osmotically active compounds, antioxidants, and targeted mineral supplementation.<\/p>\n<p>One of the most scientifically substantiated ingredients for <strong>heat stress in poultry<\/strong> is betaine. As an osmolyte, betaine protects cells from dehydration and osmotic stress by retaining water within the cell. This mechanism is particularly relevant during heat, when animals lose more water through evaporation. Scientific research confirms that betaine improves breast muscle weight under heat stress conditions through enhanced cellular hydration and antioxidant protection. Learn more about how this ingredient works on our page about <a href=\"https:\/\/jodoco.com\/en\/betaine\/\">betaine in animal nutrition<\/a>.<\/p>\n<p>In addition to betaine, the following nutritional measures are also effective at high temperatures:<\/p>\n<ul>\n<li><strong>Electrolyte supplementation:<\/strong> Heat stress causes loss of sodium, potassium, and chloride through increased respiration. Supplementation via drinking water helps restore the balance.<\/li>\n<li><strong>Vitamin C:<\/strong> Poultry produce insufficient vitamin C under heat stress, reducing immune function and antioxidant capacity. Supplementation via drinking water compensates for this deficiency.<\/li>\n<li><strong>Organic acids:<\/strong> These lower the pH in the gastrointestinal tract, inhibit pathogenic bacterial growth, and support gut health, which is especially vulnerable under heat stress.<\/li>\n<li><strong>Adjusted feeding times:<\/strong> Feeding animals in the early morning and late evening reduces metabolic heat production during the hottest hours of the day.<\/li>\n<\/ul>\n<p>Administering supportive substances through drinking water offers an additional advantage: water intake in poultry is more reliable than feed intake during heat stress. Animals continue to drink even when they eat less, making drinking water supplementation an effective delivery method during periods of heat.<\/p>\n<h2>Which poultry breed is best for warm climates?<\/h2>\n<p>For warm climates, the Naked Neck or a Naked Neck crossbreed is generally the best choice for meat production, while the Leghorn or locally adapted laying breeds are most suitable for egg production. The optimal breed depends on the production goal, climate profile, and available housing infrastructure.<\/p>\n<p>In regions with extreme and prolonged heat, such as Southeast Asia, the Middle East, and parts of Africa, local breeds consistently outperform imported commercial hybrid breeds. They have been adapted to local conditions through generations of selection and have a higher baseline heat tolerance, even if their genetic production figures fall below those of modern hybrid breeds.<\/p>\n<p>For professional livestock farmers who do not want to compromise on productivity, modern heat-tolerant hybrid lines offer a middle ground: these have been selected by breeding companies for both production capacity and heat adaptation. Combined with a targeted nutritional strategy, these breeds can perform well in warm climates, provided that housing and management conditions are optimized for heat mitigation.<\/p>\n<h2>How Jodoco helps with heat stress in poultry<\/h2>\n<p>At Jodoco, we have developed a product portfolio specifically designed to address the challenges of heat stress in poultry. Our solutions are scientifically substantiated, based on natural ingredients, and designed for professional livestock farmers and distributors who aim for consistent performance \u2014 even during warm periods.<\/p>\n<p>Our approach combines multiple mechanisms of action in a single formula:<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/jodoco.com\/en\/producten\/jodobet\/\">Jodobet<\/a>:<\/strong> Our betaine feed application, which acts as a proven osmoregulator to reduce heat stress, support gut health, and improve carcass quality. Effective in broilers, laying hens, and turkeys.<\/li>\n<li><strong><a href=\"https:\/\/jodoco.com\/en\/producten\/jodoplume\/\">Jodoplume<\/a>:<\/strong> A liquid combination of betaine, organic acids, and copper for administration via drinking water, ideal during heat or coccidiosis stress.<\/li>\n<li><strong><a href=\"https:\/\/jodoco.com\/en\/producten\/pure-c-beta\/\">Pure C Beta<\/a>:<\/strong> Betaine combined with vitamin C for enhanced immunity and optimal hydration, to be administered over five consecutive days via drinking water.<\/li>\n<li><strong>Drinking water support:<\/strong> Because water intake during heat stress is more reliable than feed intake, our <a href=\"https:\/\/jodoco.com\/en\/drinking-water-and-feed-additives-animals\/\">drinking water products<\/a> offer a flexible and controllable dosing strategy that gives the farmer complete control.<\/li>\n<\/ul>\n<p>Want to know which combination best suits your situation, your breed, and your climate? <a href=\"https:\/\/jodoco.com\/en\/contact\/\">Contact us<\/a> and we will be happy to help you develop a targeted approach for the summer of 2026 and beyond.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Leghorn, Naked Neck, or a local breed? Discover which poultry breeds handle heat stress best and how nutrition makes all the difference.<\/p>\n","protected":false},"author":3,"featured_media":10713,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10815","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-geen-onderdeel-van-een-categorie"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Which chicken breeds are the most heat-tolerant? - Jodoco<\/title>\n<meta name=\"description\" content=\"Heat-resistant breeds such as Leghorn and Naked Neck perform better in high temperatures. 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