ISSUE FOCUS 80 FEED & ADDITIVE MAGAZINE July 2025 to better calcium mobilization for the bones and eggshell and control of oxidative stress caused by Heat Stress. By incorporating CalseaGrow at 1kg/ton of feed into their diet it is possible to enhance calcium deposition in both bones and eggshell increasing the shell quality of the egg. Additionally, this innovative approach reduces the oxidative stress, improves feed intake during stress by increasing the nutrient absorption. It maintains and promotes gut health, which contribute to sustain egg production. Our recommendation is: Supplement CalseaGrow 2 weeks before the heat wave, in order to help counteract the negative effects of heat stress. How? Without CGW With CGW Heat stress Start CalseaGrow supplementation 2 weeks before the heat wave. 1kg/ton for 10 weeks Reduction in feed Intake 2% Laying rate 3% FCR 6% Shell thickness 6% Shell strength 8% Albumen height Improves gut health Increases feed intake Reduces oxidative stress Reduces HS effect Reduction in egg production Deterioration of egg quality Increase of mortality How to use CalseaGrow During Heat Stress Temperature Symptoms Security Measures THI > 88 +38°C Extreme Heat Stress Severe Heat Stress Mild Heat Stress Ideal Temperature THI = Temperature Humidity Index - THI = 0,8T + ((RH(T-14,3))/100) + 46,3 • No more thermoregulation • Excessive panting and open-mouth breathing • Wing spread to release heat • Lethal for poultry 1. Avoid handling bird during hot part of the day 2. Feed early in the morning and in the evening 3. Reduce light intensity to reduce activity and heat production 4. Apply vaccination/treatment in the water 1. Increase ventilation 2. Adjust feed formula to maintain nutrient requirements 3. Keep the water temperature under 25 degrees to increase water and feed intake 4. Use intermittent lighting programs to increase feed intake 5. Adjust feeding schedule 1. Check density and lighting 2. Beginning of ventilation and prepare roofing sprinklers 3. Start using vitamins and electrolytes to compensate for loss of sodium, chloride, potassium and bicarbonate 4. Provide additional sources of cool water 5. Increase palatability with fats instead of high fibers 1. Make sure clean water is available with a sufficient water flow 2. Ensure proper ventilation and air circulation 3. Check density and lighting • Respiratory distress and panting • Tissues oxidation • Reduced activity • Increase of thin shelled eggs • Reduced egg size, increase of FCR • Drop of feed consumption • Reduction of Ca availability • Slightly increased water consumption • Metabolic rate reduced • Drop of lay • Open wings and open feathers • Reduced gut functionality • Optimal laying rate • Normal feeding and drinking pattern • No sighs of distress or panting 80 < THI < 87 30°C - 37°C 73 < THI < 79 24°C - 29°C THI < 72 15°C - 23°C Heat Stress: Symptoms and Security Measures
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