(1) Under normal behavior, chicks are quick-thinking, lively and struggling, with loud and clear calls, bright eyes and even breathing. If you get together or stay still, close your eyes, scream sharply and squeeze into the heat source, indicating that the incubation temperature is too low; For example, chickens stretch their wings and necks, open their mouths to breathe, have shortness of breath, drink water frequently, and stay away from heat sources, indicating that the temperature is too high; The chicken is far away from the vent, indicating that there is a thief wind in the henhouse. The neck is bent, the head is tilted back, and it is star-shaped or twisted, which is caused by Newcastle disease or vitamin B 1 deficiency. Wing drooping, leg paralysis and split posture are mainly seen in nervous Marek's disease in chickens, and sometimes vitamin B 1 deficiency can also cause it; When ascites occurs, the abdomen is swollen and drooping, standing or walking like a penguin, and pressing the abdomen has a sense of fluctuation; Dyskinesia or duck gait is common in rickets or rickets; Vitamin B2 deficiency can cause claws to bend inward. (2) Observe that the feathers of healthy chickens are smooth, flat and dense. If the feathers are unkempt, dirty and dull, they are more common in chronic diseases or malnutrition; Feather broken or broken in the middle, more common in feather lice, pecking feathers; Chickens have few feathers, which is a sign of lack of nicotinic acid and pantothenic acid. (3) Observe that the feces of normal feces are blue-gray, with a small amount of white urate on the surface. When chickens are sick, they often discharge unusual feces, such as watery stools, which are mostly caused by high humidity, hot weather and excessive drinking water in the henhouse. Bloody stools are more common in coccidiosis and hemorrhagic enteritis; White lime-like thin feces are more common in chicken dysentery, infectious bursal disease, infectious bronchitis, gout and so on. Green feces are more common in Newcastle disease and colibacillosis. Aflatoxin poisoning, excessive salt, paratyphoid fever and other excretory feces. (4) Observing Breathing When the weather changes suddenly, the ammonia content in the henhouse is too high, there is too much dust, or after vaccination, it is easy to stimulate respiratory diseases. Therefore, during this period, we should pay attention to the respiratory frequency and posture of chickens, whether there is runny nose, cough, eyelid swelling, abnormal breathing sound and so on. When chickens suffer from Newcastle disease, chronic respiratory diseases, infectious bronchitis and infectious laryngotracheitis, they often purr or wheeze, especially at night. (5) If there is a foot pad on the observation leg claw, it is mostly caused by the mat net being too hard or the humidity being too high; If the ambient temperature is too high and the humidity is too low, it is easy to cause dry cracking; If the mat net has burrs, untreated joints and other factors that are easy to cause trauma, chickens are easy to be infected with staphylococcus and cause leg diseases. If the legs and claws are dry, colibacillosis, gout and renal infectious bronchitis should be considered. (6) When observing the normal situation of Celosia cristata and Vitex negundo, Celosia cristata and Vitex negundo were moist and slightly bright red. If the comb is purple-black, it is common in cecal hepatitis or chicken dying; The cockscomb is pale, which can be seen in white matter looseness and visceral rupture. There are dark brown scabs with prominent surface, different sizes and unevenness on the crown and wattle, which are the characteristics of skin-type chickenpox. Swelling of the head and muscles is usually a manifestation of avian influenza. (7) When the corns are normal, they are round, shiny and clean; The corns are moist and moist, which are common in vitamin A deficiency, mycoplasma infection and infectious rhinitis. The conjunctiva of healthy chickens is red. If there is cheese-like substance in conjunctiva, exophthalmos and corneal ulcer, it is common in chicken aspergillosis. The conjunctiva has slightly raised nodules, and the iris has a cheese-like substance that is not easy to peel off, which is common in ocular chickenpox. (8) Observe the consumption of feed and drinking water. Under normal growth conditions, food intake and water consumption remained stable and slowly increased. If it is found that the intake of food and the amount of drinking water are obviously reduced, it is a precursor to the disease. When you find that there are too many scraps, you should pay attention to whether the nearby chickens are sick. (9) Touch inspection is mainly to check the size, fullness, growth and development of crops, adjust feed nutrition according to the fat status or fullness of pectoral muscles, and strengthen feeding management.