The suitable growth temperature for broilers is 18°C ​​to 24°C, and the tolerance to heat stress is poor. Under high-temperature environmental conditions, feed intake decreased, weight gain slowed down, immunity decreased, and weight died. In summer and autumn, the temperature in the broiler house often exceeds 24°C and can even reach 35°C. How to raise broilers this season? Today, this section gives you some knowledge of this aspect. Carefully adjusting the food intake and nutrition of broiler chickens reduced the feed intake in high temperature environments. At 25°C or more, feed intake decreased by 1.6% for every 1°C increase and feed utilization decreased. Therefore, dietary nutrition and composition should be adjusted appropriately so that the diet maintains an appropriate level of nutrition to compensate for the lack of nutrient intake caused by high temperature stress. Mainly from the increase of energy concentration, maintaining electrolyte and acid-base balance, vitamin supplements, feeding green and juicy feed, and reasonable arrangements for feeding time and other aspects of adjustment. The proportion of carbohydrate feed can be appropriately reduced in the diet, and some fats with high energy and low metabolic heat production can be added, and the palatability and feed utilization ratio of the feed can be increased to increase the energy concentration; the dietary protein level can be reduced and the essential amino acids can be maintained. The amount of added protein, as long as the essential amino acids are satisfied, makes the protein level as low as possible. In order to maintain acid-base balance in chickens and improve the performance of chickens during heat stress, additives such as sodium bicarbonate, ammonium chloride, and potassium chloride may be added to the diet or drinking water. Normal sodium bicarbonate is added in the feed by 0.5%; ammonium chloride is added in the feed by 0.3% to 0.5%, or in drinking water by 0.15% to 0.3%. The vitamin is adjusted to 2 to 3 times the normal amount. Hot season supplemented with 0.02% to 0.04% vitamin C can significantly reduce the impact of heat stress on broilers and improve production performance. According to experiments, vitamin E supplementation can also play a role in heat stress. In summer, the appetite of the chicken is weakened. Feeding time can be changed in the morning and evening when it is cool. When it is hot in the middle of the day, it can be fed with green and juicy feed such as watermelon rind, roots, and vegetables, but care must be taken to ensure that the chickens have enough rest time. In order to increase the feed intake of chickens, low-calcium feeds can be fed, and bone pellets and shell pellets can be added separately to allow chickens to feed freely; the pellets can be changed to pellets and fed with green feed; Effective flavoring agent. Stress response 咋 Treatment In order to avoid or reduce the stress response of broilers caused by high temperature and other factors, some drugs with preventive and therapeutic effects may be added to feed or drinking water. If chlorpromazine is added with 0.1% sedative in feed, it can reduce basal metabolism and heat production of broilers, which helps to maintain heat balance and increase feed conversion rate and weight gain rate. Adding 0.25% citric acid to feed can buffer blood alkali in broilers. The harm caused by sex can increase the daily weight gain of broilers under heat stress. Adding 0.05% aspirin to the feed can significantly reduce the heat stress and improve the production performance. According to the information, yeast is added to the feed. Chromium or chromium pyridinate also has the effect of improving the performance and immunity of broilers under high temperature conditions. In addition, some Chinese herbal medicines with heat-clearing, detoxifying, anti-bacterial, anti-inflammatory or immune-enhancing functions can also be used, such as honeysuckle, chrysanthemum, dandelion, Acanthopanax and others. Improving the chicken farm environment To create a good environment for broilers, measures should be taken to reduce radiant heat and reflected heat, increase ventilation, reduce temperature and concentration of harmful gases. The sheds should not be too short. The roof should be 5 meters high. It should be as far north as possible and south east-west. There should be more windows or ventilation holes. The roof should be insulated and painted with paint, paint, lime milk, etc. A thick wet grass curtain; At the same time, install the necessary heatstroke cooling equipment such as high-speed fan or ceiling fan. If it is a plastic or tile-top henhouse, vines can be planted around the house and spread to the roof to form a pergola. Regardless of the type of chicken house, it is best to plant turf, vegetables or vines around the ground so as not to expose the ground. When the weather is hot, open the window or ventilation hole, start the exhaust fan, increase the airflow speed in the house, and speed up the ventilation; open the chicken house, open the doors at both ends of the long axis, and use the gate to make the air grow along the house. Axial flow. When the temperature in the house exceeds 32°C, in dry areas, cool water may be sprayed on the air inlet or a low-moisture rotating nozzle sprayer to cool the roof, ground, and chicken bodies. In wet areas, cold water may be sprayed directly onto the chicken body. The fan speeds up the body heat dissipation. If conditions are high, high-speed fans or fans may be added to the long axis of the house at high temperatures to speed up air flow. Day-to-day management Note: Feeding broilers in the summer should appropriately reduce the rearing density and reduce the production of heat-producing gas; adequate material levels and water levels should be set to ensure that each chicken can eat and drink water to improve the uniformity and resistance of chickens. Disease power. Chickens are scared and scared, and their resistance to disease is reduced in high-temperature environments. They must be managed strictly in accordance with the rules of the breeding operations. Improved feeding methods should be carried out gradually and not too suddenly. Try to reduce the interference of bad factors in the environment, keep the shed quiet, and avoid artificial stress reactions such as deafness, weight measurement, and immunization. It is forbidden to feed rotten and degenerate feeds to ensure adequate supply of clean drinking water. The sink should be sanitized and sanitized once a day. To keep the water inside and outside the house open, the house is clean and dry. If the ground is raised flat, dry, clean, absorbent, non-toxic, non-irritating, mildew-free loose bedding should be used. It is best to dry the fine sand. To remove the feces on time, flip the padding. The litter that has been infiltrated with water and contaminated with feces should be promptly replaced. Strictly implement the health and epidemic prevention system and vaccinate them according to immunization procedures. Do their best to maintain the sanitation of the house and disinfect it at least once a week. Pay attention to the use of drugs that are less harmful to chickens and eliminate pests such as mosquitoes and flies in time. Strengthen the observation of chickens, pay attention to the mental state of the flock, behavior, feeding conditions and fecal form, and take appropriate measures in time when abnormalities are found.