Livestock husbandry technology guides chicken farmers, and the laying rate of laying hens is always the most important indicator to measure the production level of laying hens. However, the production of laying hens is affected by very complicated factors. Therefore, how to increase the laying rate is to increase efficiency. The key measures taken by the livestock technicians over the years in their production and clinical practice are that egg production in laying hens is mainly affected by the following factors. Genetic factors, nutritional factors, disease factors, management factors, egg production rules, etc. First, the genetic factors of different breeds of laying hens have different genetic properties, so the egg production rate is also different, to use good reproductive performance varieties, such as Hyland Brown, Jinghong 1, Beijing powder No. 1 and so on. Second, nutritional factors 1, feed hygiene is not up to the standard use of non-compliant standards for the use of non-compliant feed, in particular, can not use mold deterioration of poor quality feed, feed imbalance in nutrients or lack of serious impact on egg production. 2, the impact of mineral elements in feed The content of iron, magnesium, zinc, manganese, etc. in feed will affect the absorption of calcium and phosphorus, and thus affect the quality of eggshell, when these mineral elements in the body high levels, will form insoluble with phosphate ions Phosphate affects the absorption of calcium. Therefore, in the supplement of trace elements, the amount can not be too large, while taking into account the factors of drinking water hardness. 3. The content of calcium in the diet is insufficient. The main component of the eggshell is calcium carbonate, which accounts for about 94%. The daily intake of calcium during the laying period of laying hens is mainly to meet the need of laying eggs. A chicken needs about 3~3.5 calcium per day. g, too high and too low will affect the quality of the shell. Therefore, in the laying period must choose a feed with high calcium content, and calcium supplement to help the body's absorption, add methods and time: when the chicken sees the first egg or 2 weeks before opening (about 18 weeks old) To take care of the hens that have been laid, some shell powder may be added to the diet to allow the chickens to feed freely until they reach 5% of the time. 4, the content of phosphorus is not the body's calcium, phosphorus absorption is always synergistic, the appropriate phosphorus content can promote the absorption of calcium. In the brooding and rearing period, when the ratio of calcium to phosphorus is 1.5 to 2:1, the absorption and utilization of calcium and phosphorus are the highest. The calculation of phosphorus content in production requires the calculation of available phosphorus in the feed. Phosphorus in plant feeds is mostly in the form of Phytate Phosphorus and is not easily decomposed and absorbed. Therefore, inorganic phosphates or animal phosphates must be added to ensure the supply of phosphorus, or phytase is added to promote the decomposition of Phytate Phosphorus to ensure certain blood The phosphorus content of the laying hens results in a ratio of calcium to phosphorus of 5.5:1. 5, vitamin D content is insufficient Vitamin D is a calcium absorption of the cofactor and promotion factor, can increase plasma calcium and phosphorus levels, to ensure the normal bone minerals and other body functions. When the calcium concentration in the blood is low, the demand for vitamin D increases. However, vitamin D cannot compensate for the lack of calcium and phosphorus. Therefore, there must be sufficient vitamin content in the feed for laying hens. This higher content may reduce the importance of calcium and phosphorus ratios. However, as a fat-soluble vitamin, we must pay attention to excessive poisoning. In addition, the relationship between vitamin E and vitamin A and egg production is also very close. Third, disease factors 1, egg drop syndrome. It is an infectious disease caused by adenovirus. The virus can replicate in the secretion of eggshell in the narrow part of the fallopian tube, leading to mucosal secretion disorder. 2, infectious bronchitis. Virus infection in chickens can deform the eggshell glands in the uterus and affect eggshell color. 3, E. coli, Salmonella, and saccharomyces. Through a large number of intestine in the intestinal tract, resulting in imbalance of intestinal flora, so that the digestion and absorption function decline, resulting in the body's ability to absorb calcium decreased, calcium deficiency, in addition, can also cause bacterial salpingitis, yolk peritonitis. In addition, special attention should be paid to the fact that, after the laying hens are ill, they are inevitably unavoidable. The following medicines cannot be used for laying hens: (1) They are sulfa drugs that are poisonous to the body. After 3 consecutive days, the eggs are significantly reduced. (2) is a furan drug, such as enrofloxacin, which inhibits egg production. (3) It is chlortetracycline that is insoluble in calcium formed in the blood and is eliminated from the body and affects egg production. (4) Aminophylline has a relaxing smooth muscle effect, which can relieve asthma caused by bronchial smooth muscle spasm, but it is obviously used for laying hens. (5) Antiviral drugs (such as amantadine), anticoccidial drugs (such as grams of ball powder, etc.) and adrenal cortex hormones (such as dexamethasone, cortisone, etc.) also affect egg production. Fourth, management factors 1, affecting the larger production of eggs is the temperature, light, the concentration of ammonia in the chicken house and a variety of external stress. 2. The most suitable temperature for laying hens is 15-22°C. Take measures for winter insulation and cooling in summer. As the temperature rises, the feed intake of chickens decreases, the absorption rate of calcium in the intestine decreases, and the high temperature increases the respiration of chickens. The supplemented calcium diet cannot contain many other mineral elements, so as to avoid antagonism in the body. 3, the impact of environmental factors on the quality of the shell quickly discharge more carbon dioxide, so that the concentration of carbon in the blood drop, eggshell thinning. Therefore, attention should be paid to cooling during the hot season. In addition to ventilation, other measures can be taken to prevent the heatstroke, such as roof whitening, water spray, spray cooling or installation of electric fans are effective. At the same time to properly increase the amount of calcium in the feed. Adding a certain amount of sodium bicarbonate to the diet to increase the concentration of carbonic acid in the blood also contributes to the improvement of eggshell quality. 4, the role of light can make the skin dehydrogenation solid acid into vitamin D, promote the absorption of calcium and phosphorus. Laying time of 16-17 hours / day, the intensity of 2.7-3.5 watts / square meter. Poultry houses are poorly ventilated and the harmful gases in the houses reach high concentrations. The resulting adverse effects often exceed the effects of low temperatures. Therefore, it is necessary to remove chicken manure in time, strengthen the ventilation of the house, and reduce the content of harmful gases such as ammonia gas and hydrogen sulfide in the house. 5, change the feed. Changing the feed requires a process of gradual replacement for at least 7 days. Otherwise, sudden refueling can seriously affect the production of eggs. 6, to prevent noise, sudden changes in the weather, changing clothes and other keeper, but these external stress on the egg production rate is a temporary effect, as long as the stress is eliminated, the egg production rate will automatically rise. If the flock suffers particularly severe stress, the egg production rate will not rebound, but feeding anti-stress products properly will help the egg production rate to rise. Fifth, the egg production law 1, the experiment proves that attention to laying hens egg production health, the use of functional additives is an effective way to increase egg production rate, add garlic or kelp powder can increase production. Garlic contains protein, sugar, vitamin A, vitamin B, vitamin C and calcium, phosphorus and iron. Allicin can increase feed intake and improve digestion. Years of experience show that adding 3% in the diet can increase egg 5%. Kelp powder is rich in iodides, minerals, and vitamins and active substances that promote growth. 2, under specific conditions, adding the right amount of Maifan stone, tryptophan, choline, etc. can also increase the egg production rate. 3, artificial forced moulting, extend the egg production cycle, increase the value of the layer of eggs to achieve the purpose of increasing eggs. 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