1.Reduce the ambient air temperature:

Measures taken to reduce ambient temperature:

（1）Indoor spray:Install a water spray system in the poultry house, especially an automatic spray system, and spray regularly. This law should pay attentionThe key is:Master the size and uniformity of droplets.The size of the droplets should be easy to evaporate and not easy to fall to the ground.Spray should also pay attention to moderate,Avoid hot and cold, causing chickens to induce respiratory diseases.The advantages of this method are: low noise, can also consider the regulation of humidity, and can take into account the disinfection of birds.

（2）Water Curtain or Water Wall and Ventilation:Hanging hemp nets on both sides of the poultry house, or setting a net wall at one end of the fence house, equipped with artesian ventilation fans,

The hot air entering the house is pre-cooled.

（3）Insulation:The roof of the shed is made of terracotta tile structure, or the roof of the shed is made of iron sheet and nylon sheet is added with fir skin, and the roof water spraying system is set at the same time.In the hot season, often keep the roof damp.

（4）Change the flat ground to the scaffolding, pay attention to the ventilation of the shed bottom.

（5）Reduce as much as possible the breeding density in the hot season.

（6）Increase the shade of the playground.

（7）Grass is widely planted in the open ground of the poultry farm, and the grass is often kept moist.

2. reduce heat production in the poultry body and increase heat dissipation:

（1）Change the time of eating and change the feeding during the day to that at night or early in the morning. Because eating activity, especially the activity of the digestive systemIt produces a larger amount of body heat, and when the poultry is full in the morning, it will rest quietly in the subsequent daytime hours, reducing the number of liveChattel heat.

（2）During the day, the light in the bar is reduced as much as possible, because the light is too strong to stimulate the hypothalamus body temperature center to produce heat and shoot.

（3）Promote drinking cool water and diuresis, take away body heat and urine heat with drinking water. If you add an appropriate amount of NaCL or KCL to drinking water, you can makeWater intake increased and cooling effect strengthened.

（4）Adjust the energy source in the beverage, increase the fat, reduce the carbohydrate content, because the body uses the fat production capacity than the carbohydrate production capacity process to produce low calorific value.

3. improve the body's ability to resist heat stress:

（1）Add the right amount of vitamin C to the feed.

Under heat stress, the concentrations of sodium, protein and corticosterone in the plasma of poultry were abnormal (corticosterone has the ability to regulate sugar, proteinquality, water and salt metabolism, etc., plays an important role in maintaining the constant internal environment of the poultry body), and taking the lifeelementC can alleviate these abnormalities and restore them to a nearly normal state.

 

Understanding Poultry Summer Heat Stress

      Livestock and poultryheat stressRefers to the ambient temperature exceeding the appropriate temperature value for poultry (21-26 degrees), the physiological and behavioral response of livestock and poultry. Livestock and poultry are thermostatic animals. When the ambient temperature is at the appropriate temperature, their growth, development, and reproduction functions perform the best state, and the production efficiency is the highest; when the ambient temperature exceeds the appropriate temperature, the body immediately needs to adjust its physiological activities and behaviors to adapt to the temperature Changes, maintain normal body temperature, and ensure normal growth and development needs.

     Experimental and production experience shows that, short-term and mild air temperature changes (26-32 degrees) for poultry, it can be adjusted and adapted through mild stress behavior. On the contrary, a long-term and relatively large increase in temperature (above 32 degrees) will cause physiological dysfunction and growth retardation of poultry, which will lead to a series of production indicators (such as growth rate, carcass quality, egg fertilization rate, hatching rate, etc.) decline, and even cause poultry failure and death, making producers unprofitable or losing money.

     Mechanism of Heat Stress Harm to Home: The ambient temperature exceeds the appropriate temperature value for poultry, when it exceedsAt 32 degrees, poultry will show a series of severe physiological and behavioral stress, includingHeat wheezing, increased heart rate, redistribution of circulating blood, increased oxidative processes in the body, increased fecal excretion, abnormal plasma sodium, protein and adrenocortical hormone concentrations, especially increased corticosterone secretion, increased or inhibited nerve excitability.When these physiological changes are too dramatic, they will cause the following hazards and even death to the poultry.

Manifests of heat stress

     1. Hot wheezing:Proper thermal wheezing can increase body heat dissipation, but excessive wheezing will result in excessive CO2 excretion, bloodThe partial pressure of CO2 decreases and the PH value rises, inducing alkalosis. If the compensatory heat wheezing is late, the respiratory centerInhibition, the accumulation of excess H2CO3 in the body may lead to acidosis. In addition, hot wheezing can damage the respiratory tract stickymembrane, causing respiratory congestion, bleeding, secondary pathogenic infection.

     2, heart rate increased:Due to heat stress and heat wheezing (shallow breathing) lead to insufficient oxygen in the blood, heart rate compensatory acceleration, bloodIncreased pressure, which can lead to increased intracranial pressure, cerebral congestion and even bleeding, fainting; heart failure after heart rate tachycardia can lead to venous return disorders, pulmonary congestion, edema, hypoxia and acidosis.

   3, the body oxidation process intensified:Due to the increase of body temperature, the oxidative metabolism of the three major substances in the body is strengthened, the harmful metabolic intermediates and end products are increased, the cell lipid membrane is oxidized and destroyed, and the vascular wall gap is enlarged, which can easily lead to bleeding, hemolysis, tissue damage and self-poisoning.

 4, increased secretion of adrenal cortical hormone:In the early stage, the metabolism is enhanced, the consumption of energy and protein is increased, the body is in a state of high tension, and then it is gradually exhausted, which can lead to the increase of lymphocyte endonuclease activity and the weakening of cellular immunity and humoral immunity.

5, in order to increase heat dissipation, fecal excretion increased, resulting in the loss of potassium, sodium and a variety of trace elements, electrolyte imbalanceand water loss, etc.