ISSUE FOCUS FEED & ADDITIVE MAGAZINE July 2025 79 heat from their body, by opening their mouth, their feathers and wings, often leading to a decrease in feed intake and nutrient absorption. This hyperventilation leads to low CO2 levels in blood and an increase of the blood pH. To compensate it, the bird degrades part of the bones to obtain carbonates and restore the blood levels. This process can lead to decrease in calcium storage of medullary bone, essential to eggshell formation (30 to 40%) during laying period. Consequently, we can observe declines in egg size, shell quality, shell color and broken eggs more frequent (Soriano, 2021). HOW CAN WE SUPPORT ANIMALS DURING HEAT STRESS? The strategy to avoid maximum issues caused by heat stress should be a combination of: • Management measures: Proper density and lighting, implementation of ventilation systems and roofing sprinklers, monitorization of feed and water intake and control of the water supply and its temperature. • Formulation assessment: Good balance and digestibility of the diet, calcium incorporation rate and form. For example, the addition of fat instead of carbohydrates in the formulation may reduce the production of heat and increase palatability. • Time adjustment: Feeding at the cooler time of the day is ideal to optimize the feed intake. Manipulation of the poultries should also be during those hours. These security and prevention measures are the first steps to reduce the impact of the heat stress (Wasti, 2020). HOW CAN CALSEAGROW HELP POULTRY UNDER HEAT STRESS? To mitigate heat stress, Phosphea created a unique blend of Peptic-oligosaccharides prebiotics and antioxidants specifically designed for layers and breeders. Due to its specific synergy between marine calcium and citrus extract, CalseaGrow provides prebiotic (POS) and antioxidant properties to the bird leading Heat Wave Increase of temperature Gut Wall Damage More susceptible to bacterial contamination Reduction of digestibility of nutrients Reduced feed intake Less calcium and nutrient intake Reduced shell weight and thickness More broken eggs Drop of lay Dirty eggs Alkalosis Low quality shell Increase water consumption Wet faeces Excessive loss of CO2 and increasing blood pH Mortality Less Activity Panting Consequences of Heat Stress on Layers and Breeders
RkJQdWJsaXNoZXIy MTUxNjkxNQ==