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At present, China's chicken breeding industry has developed relatively well. There are professional households in villages and villages, and even professional villages and professional towns have emerged. However, in terms of their technical level, they still need to be improved. Therefore, the author believes that it is necessary to introduce the feeding and management of chickens, especially laying hens. The following paragraphs are divided into stages according to the different stages of growth and production of laying hens. A 0-5 week old age of 1-35 days is the period of development of various bred chicks. Each organ of the chicks has gradually developed from unsound or imperfect function. The chicks have poor resistance to various external stress factors. The main reliance on maternal antibodies to protect against disease, are vulnerable to environmental effects and pathological phenomena and even death. Therefore, we must pay attention to control the temperature, humidity, ventilation and ventilation of the brooding broiler house, add water to the chicks at a proper time, and give sufficient light to allow the chicks to have a good living environment. Now people tend to breed light chickens, but due to their genetic breeding requirements, one-sided, resulting in light chickens are not easy to reach the standard, timid, easy to panic group, easy to produce spasm. Therefore, the quality of the diet should be properly increased before 1 week of age, and the level of protein and multivitamins in the feed should be increased; attention should be paid to the prevention of coccidiosis and chronic respiratory diseases. It should be noted that if chickens develop infectious bronchitis during this period, the proportion of fake hens will increase significantly in the future. Therefore, various multivalent vaccines for vaccination must be inoculated. Of course, early immunization of other diseases is also very effective. important. In short, before the age of 5 weeks is the key to the profitability of the entire batch of chickens. Second, the organ function of 6-8 week-old chicks is gradually normal outside the sex organs, able to adapt to the external environment and has a high resistance to disease, it can be said to survive independently. This stage is the maturity and adaptation period of the system, and it is also the beginning of the gradual development of bones. While ensuring the full price balance of feed nutrition, the appropriate amount of feed is given to promote the daily consumption of materials to meet the standard. Pay attention to adjusting the evenness of chickens. It is very important to reach the end of the 8th-week-old chicken group because it affects whether the breed can develop to the proper body size. Obviously, the small, short-stiff chickens have no feeding value. At the same time, we must eliminate the small cocks in the flock in time to avoid wasting feed. During this period, try to do the first immunization for infectious laryngotracheitis and flu. Third, 9-12 weeks of age This is the breeding period, young chicken lively eating, physically strong, relatively low feed nutrient requirements. Because of this, farmers often ignore the management of the breeding period, and believe that the management of broiler chickens is extensive, and that it is better to manage one type of pipe and one pipe to be different. In actuality, broiler chickens are an important period for the development of the skeleton and muscles of chickens, and it is time for hanging shelves. The purpose of reducing the diet level is to increase its feed intake and increase its resistance to rough-feeding and digestion and absorption of the gastrointestinal tract. No matter how the broiler is in any season, it must try to make its daily consumption exceed the standard 5%. Since this period is the roughage period, it is relatively easy to suffer from some environmental diseases such as E. coli disease, enteritis such as bacterial toxin poisoning, and aspergillosis and parasitic diseases. Regular anti-dosing and daily disinfection work should be done and anti-worm medicines should be fed in a timely manner. In the later stages, we must evacuate the flock density and fix the number of cages and cages. We must start laying nests for flat laying hens. Four, 13-18 weeks of age This is the back-up period is the chicken before laying eggs, this time the chicken's reproductive system, including the fallopian tubes, ovaries and gonads into rapid development. The cocks began to grow up, cheeks were ruddy, feathers were smooth and shiny, plumage was full, and limbs were wide. From this time on, the chickens can basically predict the future production performance, and the development of chickens is uniform, evenness, uniformity of sexual maturity, evenness of immunity, etc. are greater than 80%, indicating excellent. Individual chickens with small or severely overweight or inconsistent sexual development should be found as early as possible and reared separately in order to qualify. If necessary, repairs should be carried out to prevent wastage of feed and cockroaches. At the end of the period, the amount of daily eclipse of chickens should be close to 100 grams, and the body weight should reach the weight of production or exceed the standard slightly. Attention should be paid to adjust the diet to increase the protein content to 16%, increase the content of calcium and phosphorus, and gradually increase the amount of shell powder. In order to prevent chickens from prenatal diarrhea, they may reduce the crude fiber content and stone powder content, or switch to finished products. During the lighting control should be reasonable, can not extend the lighting time or increase the light intensity, the time should not be less than 14 hours? This is to stimulate the sexual development of hens. At this time, some chickens have already laid eggs. Therefore, the epidemic prevention work should be completed and done well. At the same time, it is necessary to carry out prenatal preventive administration and deworming of chickens in order to relieve chicken stress. Five, 19-24 weeks of age, the initial period of egg production is effective, that is to say spent more than ten yuan cost of chicken has finally received benefits. As a result of good pre-management, the egg production rate of chickens has risen steadily and has risen step-wise. Generally, from egg-to-opening, the 50% egg production rate takes about 20 days, and it reaches a peak after about 3 weeks. At this stage, we must pay attention to changes in the egg production rate, strengthen feeding and management and daily work, and do a good job in environmental sanitation. The egg production rate rose until 16 hours of constant light intensity of 5-10 lux. In the past two years, due to the impact of fierce communicable diseases, the egg production rate at the peak of the chicken has been increasing or has dropped suddenly, which is worthy of attention. However, as long as the farmers adopt scientific and rigorous methods for the feeding and management of laying hens, they can avoid or reduce losses. At the same time, the brooding time can be reasonably arranged, and the egg hatching chickens produced by the diseased breeder chickens are forbidden, so that the age of the first-born chickens avoids the seasonal epidemic. In this issue, we must pay attention to eliminating fake hens in the flock. 6. The peak period of 25-36 weeks is the period when the efficiency of transformation is the fastest. It is necessary to provide enough clean drinking water for chickens and to eat freely. The full price of dietary nutrition should not be used to adjust the diet formula or replace the feed brand. Disinfect the chickens and the environment in a regular manner with chickens. Pay attention to cold and heat resistance. Sprinkle fresh water outside the house during dry weather, increase dust, and feed them in summer. However, use of chemical drugs and anthelmintic drugs should be minimized to avoid any form of immunization. If the birds are found to be abnormal, they should immediately go to the veterinary station for treatment. As for the immunization of the new branch, antibody monitoring should be carried out and the necessary scientific immunity should be performed according to the antibody index. The benefits of the ideal peak period can basically recoup the input of the previous chickens. In the stationary period after the peak of 37-50 weeks of age, the egg production rate after the peak of the well-fed and managed chickens is still above 90%, and it is generally more than 80% at the end of the period. At this time, due to the impact of peak egg production, the broiler group began to decline, the diet consumption increased slightly, the chicken group had hair removal and moulting, and the egg quality also dropped slightly. To supplement the effects of vitamins and minerals on trace elements in the diet, the whole group will be given preventive medication to prevent the occurrence of egg fatigue syndrome. Perform the necessary immunization to increase resistance to disease. In short, it is necessary to extend the period of stability as much as possible to slow the decline in egg production and increase efficiency. VIII. At the end of the egg production at 51-72 weeks of age, the egg production rate showed a downward trend because after a period of intense egg production, the chickens could not physically meet the average daily egg weight of 50 grams. At the same time, the egg production decreased. Sudden death syndrome and abdominal cramps can lead to increased death. At this time, it is necessary to timely adjust the evenness of the flock and to eliminate those discontinued or extremely low-yielding birds that have no feeding value as soon as possible. If the flock uniformity is good, forced moulting can be considered, of course, depending on market conditions. In order to prevent the loss caused by the degradation of eggshell quality, calcium sources with high availability should be added to the feed, and the end-of-production materials should be replaced in due course so as to reduce the cost of feeding. At the same time, it is also necessary to avoid the loss of weight caused by the low intake of chickens. For example, the excessive addition of shell powder and stone powder will reduce the sensation of the ration and cause excessive digestive disorders. Nine, 73-80 week-old modern laying hens have a longer feeding cycle than the original, in the case of not less than the critical egg production rate is profitable, can be appropriate to increase farmers' income, and wait for opportunities to sell chickens. With the large-scale egg industry and the epidemic complications, chicken farming has entered a period of low profit or danger, and scientific feeding management has become more important.