Summer is hot and hot. During the brooding period, the requirements for heat preservation are not high and the time is short. This can save fuel and the brooding cost is low. However, because the hot period in most areas of China lasts for 3 to 4 months, the chickens are exposed to intense heat stress. Broilers show reduced feed intake, slow weight gain, and high mortality. If the conditions of the chicken house are poor, the chicken body is difficult to dissipate heat, and it is slightly negligible and susceptible to disease. Therefore, in order to eliminate the adverse effects of heat stress on broiler chickens, appropriate measures must be taken to ensure the smooth production of broiler chickens. 1. Do a good job of preventing heatstroke and cooling. Chickens have dense feathers, no sweat glands, and difficult heat distribution in the body. Therefore, the high temperature environment affects the growth of broiler chickens and effective measures must be taken to reduce the temperature. The position of the shed should face south to the south, and the roof insulation performance is good. There are no other tall buildings in front of the shed. The ventilation in the house is better. All doors and windows should be opened, but barbed wire should be added to the doors and windows to prevent pests and birds. Conditions may use power blast to reduce room temperature. The whitening of the roof and the south wall can reduce the temperature inside the house. The house with poor roof insulation in the hot climate can reduce the temperature of the house by 3 to 6°C. However, this method is generally not suitable in areas where the summer temperature is not high or where the high temperature is short, because this method will reduce the temperature in the chicken house in the cold season. It is also necessary to do a good job of greening the surrounding chicken house and planting lawns or shorter plants so that the ground will not be exposed and trees will be planted around, such as Populus megaphylla and Sycamore trees. In addition, the method of spraying water on the roof is practical and effective, which can reduce Sherwin's temperature by 4 to 6°C. The method is to install a rotating sprinkler head on the roof to ensure that enough water pressure can make water spray on the roof surface. It is best to lay a layer of straw on the roof so that the roof stays in a state of moisture for a long time. The water on the roof flows down from the house, and it is better to start the fan. In addition, it is also possible to adopt air curtains at the air inlet to cool the air, use flowing water to cool down, or use negative pressure or positive and negative pressure combined with vertical ventilation to achieve the purpose of preventing heatstroke and cooling. Although the temperature in summer is relatively high, the temperature difference between day and night in some areas is relatively large, or in the rainy weather and typhoon weather, thermal insulation work is still required during the early period of brooding. 2. Adjust the structure of the diet and feeding methods to provide sufficient drinking water. During the fattening period, if the temperature exceeds 27°C, the feed intake of broilers will decrease significantly. Therefore, the following measures can be taken accordingly. The first is to increase the protein content of the diet by 1% to 2%. Multivitamins increase by 30% to 50% to ensure the quality of diets and it is forbidden to feed moldy and deteriorating feeds. When feeding the wet mix, it is necessary to mix and feed immediately, and feed less. Timing is to feed the pellet feed. The broiler chicken prefers to eat pellets. Feeding the pellets can increase feed intake. Every day during the hot period, the chicken is rested and rested, which reduces body heat generated by metabolism of the chicken body, reduces heat stress, and improves survival rate. In addition, hot summer must provide sufficient cold water to allow chickens to drink; third is to add anti-stress drugs in diet or drinking water. 0.1 to 0.3 g of bacitracin per kilogram of diet can be added for use; when the temperature is higher than 27°C; 150 to 300 mg of vitamin C can be added per kilogram of feed or 100 mg of vitamin C can be added per kilogram of water Drink during the day. Because heat stress, the body's need for vitamin C increases, vitamin C has a role in reducing body temperature; can be added to the diet of 0.3% baking soda, this time should reduce the diet of salt (sodium chloride) content When hypothermia occurs during heat stress, 0.2% to 0.3% of potassium chloride is added to the diet, or 0.1% to 0.2% of potassium chloride is added to drinking water. Supplementing with potassium chloride helps reduce the body temperature of broiler chickens and promotes growth. The fourth is to do a good job in environmental health and strengthen disease prevention and control. In the summer, mosquitoes and flies must be cleared, and litter should be kept dry and soft. The humidity in the house will not be too high. Food troughs and sinks should be brushed regularly and regularly sterilized. Do a good job of epidemic vaccination, strengthen the prevention and treatment of chicken fleas, coccidiosis, aspergillosis, and so on.
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