Sudden death syndrome of broilers, also known as sudden death syndrome and acute death syndrome, is currently a common disease in the production of broilers; it is mainly found in young chickens that grow fast. 1. Clinical Symptoms Short duration of sudden death in broiler chickens + no abnormalities before the onset; mostly characterized by rapid growth, well-developed, young birds with sudden muscle plagues; some dying chickens are quieter than normal birds before onset. Feed intake decreased, and individual chickens often run out of control and have quick wings when feeders feed. Fans move or leave the ground: jump 15 to 20cm, about 1 minute from the time of onset to death; dead chickens are generally supine or supine posture with both feet upside down, neck twisted, muscle spasm, the individual chicken found when the disease There was a sudden scream. 2. Changes in necropsy: The appearance of the body is relatively full, except for the chicken crown, meat hanging slightly tide infrared no other abnormalities. The hernia sac and muscles and stomachs are filled with freshly-digested feed. The heart expands, the heart is larger than the normal chicken, the heart muscle is loose, the liver is swollen, crisp, pale, and the lungs are congested. The pectoral muscles and abdominal muscles are moist and pale. Occasionally, a few dead chickens The intestinal wall has bleeding symptoms. 3. Etiological analysis The disease is related to feeding management due to factors (nutrition, light, epidemic prevention, feeding, density, stress response, etc.). Because young chickens, especially chickens, have a fast growing stage, some of their own system functions (such as cardiovascular function, respiratory system, and digestive system are not well-developed) can not keep up with their growth rate, resulting in excessive growth and system The contradiction between functional imperfections; In addition, feed protein, fat. Fat content is too high, and the ratio of vitamins and minerals is unreasonable. It is one of the important factors. Because of the large intake of young chickens, excessive nutrient intake in the body causes excess nutrients, rapid breathing, increased burden on the heart, and corresponding increase in oxygen demand, resulting in severe consequences of rapid growth and imperfect system functions, resulting in sudden death. 4, diagnosis of the disease diagnosis process, the first should be poisoning, infectious disease differences. Most of the dead chickens have white skin, and the poisoned chickens are mostly blue. The dead chickens die quickly. The short ones last for a few seconds to a few minutes. The death time for infectious chickens is usually 1 to 3 days. The disease duration is also the shortest and several hours; , And infectious chicken excrement and more exceptions, such as bursal disease egg droppings excrement; chicken Newcastle disease row of green dilute feces, white diarrhea disease chicken row lime milk excrement and so on. 5, prevention and control measures: 4 feeding restrictions. Generally starting from the second week of age, the protein content in the feed is appropriately reduced (generally 19% to 20% is appropriate), and the fat content should not be too high. It has been reported that the use of vegetable oils instead of animal fat can significantly reduce the incidence of sudden death. 2 Control lighting. 0 to 3 weeks for 12 to 16 hours, 22 to 42 days for 18 hours, 42 days after the light for 20 hours a day, the light intensity is controlled at 0.5 to 2 lux, so as to avoid sudden death caused by stress. 8 Potassium bicarbonate (KHCO3) Drink or mix. Drinking water: For each feather of 0.6g, use it for 3 days. Mixing: Add 3.6kg per ton of feed; 4 Add multidimensional, the amount of feed is 1 to 2 times the constant, can significantly reduce mortality. China Agricultural Network Editor