Laying hens expected date 1. The effect of calcium on the expected laying hens Appropriate calcium supplementation time before laying hens is generally 2 weeks before the start of production, about 18 weeks of age. Pre-opening calcium supplementation time should not be too early: before the pre-production, the laying hens need less calcium. Premature calcium supplementation is not conducive to the deposition of calcium in chicken bones, and affects the absorption and utilization of calcium by chickens during laying. . The calcium supplementation time before the start of production can not be too late: the calcium supplementation will directly affect the body condition and egg production of the laying hen, because the calcium requirement of the laying hen is 3-4 times higher than that of the brooding and breeding period. After the laying hens are filled with calcium, the laying hens will use the calcium in the bones to participate in the synthesis of the eggshells. After a long time, the hens will have calcium deficiency, leading to cartilage and rickets. The occurrence of diseases such as sputum directly affects the amount of eggs laid. 2 pre-production period calcium addition Due to the short lead time (only about 2 weeks), the fear of wet manure squatting and the difficulty of grasping the period of pre-production calcium, most farmers gradually add stone powder according to the growth rate of eggs after the start of production. The direct consequences: 1 low egg production rate, low calcium diet inhibits poultry hypothalamic activity, decreased gonadotropin secretion, causing slow or even decreased egg production rate; 2 prone to fatigue syndrome pheasant, especially for precocious Reserve chicken. The use of feed containing calcium within 1%, the storage of bone marrow calcium is only enough to produce 2-3 eggs, such chickens will soon stop production or discontinuous egg production, the peak rises slowly, relying on sacrificial bone quality Calcium, a little longer will cause sputum due to lack of calcium, and produce egg drop syndrome. The specific method of adding calcium in the pre-production period: 1 use about 2 weeks of high-calcium feed (containing about 2.25% of calcium) without kidney disease or wet fecal sputum. It turns out that as long as 6-8 weeks before, the hens are not supplied with the hens. There will be no side effects such as kidney structure changes; as long as the broiler chicken is properly controlled within 12% of the bran, and the addition of stone powder pays attention to the transition, the problem of wet manure is not significant. 2 add time. Strictly speaking, the feed in the expected date is used during the egg production period from 2 weeks to 5% before the sexual maturity. However, due to the large difference in the feeding level of the laying hens in China, the specific time for opening is not easy to predict, so it is best to follow the second sex of the chicken. The sign that the cockscomb begins to develop as a sign for the conversion of low-calcium diets to pre-production 2.25% calcium diets is approximately 15-17 weeks of age (time is for reference only). Vertical Multistage Pump,Multistage Centrifugal Pump,Vertical Multistage Water Pump,Vertical Inline Pump Shanghai NuoSai Pump Manufacturing Co., Ltd. , https://www.nuosai.net