Laying hens enter the due date from the age of 16 weeks and reach the peak of egg production at 25 weeks of age. Many farmers often do not pay attention to the pre-production period of feeding, or even directly feed the production period of feed without pre-production materials. They think that the transition period of refueling is one week. After the transition, feeding the two-week due date feed will be replaced with the production period. Feed it. However, the pre-production period shoulders the dual task of mature and sexual maturation of hens. It is particularly necessary to pay attention to nutrition and reasonable supply, to minimize egg production stress and to prevent early egg fatigue syndrome, and lay the foundation for entering the peak period of egg production as soon as possible. . Ignoring young chicken means giving up on the perfect laying period Pre-production period is the key period of sexual maturity in laying hens. After 14 weeks of age, the size and weight of the ovary and fallopian tube began to increase rapidly. After 17 weeks of age, the growth rate of the ovary and fallopian tube was faster. The reproductive system of most chickens at 19 weeks of age was close to mature. Farmers should be aware that egg formation depends on the excellent reproductive system of laying hens, and that the continuous improvement of laying performance of laying hens in modern farming depends on continuous improvement of the chicken's reproductive system. Pre-production period is also a crucial period for the hens' body maturity. Between 18 weeks and 20 weeks of age, the weight of the bone increases by 15g-20g, and the weight of each bird increases by about 350g. This period of weight gain is crucial to the maintenance of the peak duration of the subsequent production. Less weight gain can be attributed to the short duration of the peak period and the increase in the rate of death after the peak period. It is precisely in this crucial period that relates to laying performance of laying hens that farmers generally use some quality and cheap feed products, laying a hidden danger for laying hens' perfect egg production period. Paying attention to the expected date of birth is not an arbitrary measure The expected date of birth is very important, but the emphasis on pre-production period feeding is not blindly using fat and protein to feed fat. The expected date of birth is to be compensated, but it is not a chaotic supplement but a scientific supplement. Calcium and phosphorus. Pre-production period should pay attention to calcium and phosphorus supplements. The calcium and phosphorus requirements for laying hens during the pre-production period are roughly 2.0 grams to 2.5 grams of calcium per day and more than 0.4 grams of available phosphorus. Strengthen the supply of effective calcium and phosphorus to prevent the occurrence of early egg fatigue syndrome, to reduce the incidence of anal fistula, egg production, and early egg production breakage. The calcium intake is mainly used for the deposition of medullary calcium. Medullary calcium is characteristic of a close mature female fowl and is present in the bone cavity of long bones. During eggshell formation, decomposed calcium ions can be released into the blood for egg shell formation. Insufficient medullary calcium deposition can induce problems such as fatigue syndrome in caged laying hens at the peak of egg production. The calcium content of the feed during the egg production period is generally more than 3.3%, and the calcium content of the egg green feed is generally 1.0%. If there is no transition in the middle, the calcium content in the feed suddenly increases, it is easy to cause stress diarrhea and affect the production performance in the early stage of laying. Appropriately supplement energy and protein. The weight of broiler chickens transferred into laying hens increases rapidly and the reproductive system develops rapidly. The follicles on the ovary grow rapidly in large numbers, and the fallopian tubes also quickly grow thicker and longer and increase in weight. Weight gain and reproductive system growth occur simultaneously. These changes in bodily functions require nutritive follow-up. If nutrients cannot be replenished in time, it is very easy for the chickens to start production irregularly. During this period, the crude protein content of feed should reach 15.5%-16.5%, and the metabolic energy should reach 2600 kcal -2700 kcal/kg. Pre-production materials below this standard will often result in low production opening weight and uneven production. , As well as issues such as short production cycle during egg production. Supplementary amino acids. The required amount of methionine and lysine in the pre-production period must reach the level of the egg-laying period to meet the changes in endocrine function. Before and after 18 weeks of age, the follicle stimulating hormone and luteinizing hormone in chickens began to be secreted in large quantities, which stimulated the growth of follicles and caused the ovary to rapidly increase in weight and volume. At the same time, large and medium-sized follicles secrete a large amount of estrogen and progesterone, which stimulates the growth of the fallopian tubes, enlarges pubic space, and relaxes the anus to prepare eggs. Due to the definition of the special trophic phase, the pre-production period feed cannot be used in other stages. It is recommended to use the period from the age of 16 weeks to the start of production, which can achieve the perfect transition from the pre-production period to the laying period, and realize the full production of laying hens. 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Egg production date feed use points