Measures for mitigation of heat stress in broilers

Paying attention to drinking water to manage heat stress in chickens is an extremely important factor. More than 80% of the heat produced by chickens during heat stress is emitted by evaporation. Studies have shown that the increase in drinking water is conducive to the survival of chickens.

Increasing the intake of water containing sodium chloride or reducing the water temperature can reduce the effect of heat stress. Drinking salt water has a complementary effect with the temperature of drinking water. When the temperature of drinking water is lower than the body temperature of chickens, the addition of sodium chloride in drinking water can significantly increase the amount of drinking water and growth rate; when the water temperature is close to the body temperature of chickens, adding sodium chloride to drinking water does not have much effect on chickens. . Lowering the water temperature without adding sodium chloride can also increase the amount of water consumed by the chicken; if sodium chloride is added while lowering the water temperature, it has an additive effect on reducing the heat stress of the broiler.

Reduce flock density Before the onset of summer, you can conduct a sparse grouping based on the feeding methods, such as transferring, grouping, and culling. Arrange suitable number of caged chickens and breeding density. The number of raised chickens is not too large. Avoid turning as much as possible. Groups, breaks, transportation, and other activities should also be conducted on cloudy days or when the weather is cool.

Increase ventilation in the house and reduce solar radiation. In the building of the house, consider the use of materials with good thermal insulation properties. Fiberboard can be used to hoist ceilings, walls are painted white, and trees, lawns, etc. are planted around the house. These measures include Helps reduce the radiant heat from the outside into the house. The modernization of chicken farms has a high degree of intensification, and it is an important part of preventing heat stress in broilers. The simplest method is to install a fan in the chicken house. When the ambient temperature is lower than 40°C, the wind speed increases. Helps the body heat of the chicken. In recent years, vertical ventilation has become an effective means to reduce heat stress, and the indoor air is kept fresh through constant air exchange. However, when the temperature is above 30°C, the vertical ventilation alone cannot control the heat stress, and the wet curtain cooling device must be added to effectively reduce the heat stress. Recently, the water curtain is commonly used as a humidifier at the air inlet. In addition, the use of a spray or water spray atomization device on the roof of the house can increase the evaporative heat dissipation of the roof and reduce the heat transfer from the roof to the house.

Reasonably adjust the level of nutrition (1) dietary protein and amino acid content: reduce the dietary protein content, but maintaining the level of essential amino acids can improve the growth rate and survival rate of broilers. A corn-soybean-based diet requires the addition of methionine to obtain better broiler performance. (2) Adjustment of energy concentration: The adjustment of the energy concentration in the diet should be based on the principle of minimizing the production of heat increase. Fat is the nutrient with the lowest heat consumption, properly adjust the proportion of essential fatty acids in the feed, replace some of the carbohydrates with fat, in order to increase the energy concentration of the feed and improve the broiler's adaptability during heat stress. (3) Mineral content: During heat stress, the discharge of potassium, sodium, zinc, and molybdenum increased with urine, the excretion of calcium, manganese, selenium, and copper in feces also increased, and the storage of magnesium and phosphorus also decreased. According to the need to add in time, to meet the needs of the body.

Application of Anti-stress Additives (1) Adding Vitamin C: Vitamin C supplementation during stress can significantly inhibit the rise of body temperature, increase feed intake and reduce the adverse effects of heat stress on metabolism. Vitamin C can be supplemented by feed or drinking water. (2) Adding vitamin E: Adding an appropriate amount of vitamin E to the diet of hens suffering from chronic heat stress for 1 week can significantly reduce the decline in egg production during stress and allow the egg production after stress to return to normal as soon as possible. (3) Adding electrolytes: Under heat stress conditions, broilers are prone to respiratory alkalosis and hypokalemia, resulting in electrolyte imbalance and affecting the body's regulatory activities. Adding electrolytes to drinking water or feed can mitigate the damage caused by heat stress.

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