(1) Provide low-calcium diets and maintain a balance of calcium and phosphorus. This will help promote the utilization of bone calcium in the dairy cows and absorption of calcium and phosphorus in the gastrointestinal tract; and avoid postpartum production paralysis. (2) Control the feeding amount of fine material, increase coarse material (green hay, yew grass, non-stick corn silage, etc.), so that crude: fine ≥ 60:40; this is beneficial to maintenance of rumen function and control of burdock. (3) Control the intake of leguminous plants (such as valerian) because they contain calcium, which is not conducive to the control of dietary calcium levels. (4) Control the intake of dry matter to no more than 2% of the body weight of a Holstein cow with a body weight of 600 kg, which is beneficial to effectively control the body mass of dry cows. (5) Provide high-quality protein, rich in vitamins (such as vitamin E), trace elements (such as Se), help dry cows to repair the body's function, enhance resistance, reduce the incidence of mastitis, no clothing. (6) to ensure that the cation and anion balance, provide anionic salts (such as NH4CL, MgSO4, etc.), effectively reduce the incidence of postpartum sputum. (7) Perinatal feeding: The dry cow's udder begins to develop about 2 weeks before delivery. In order to enable the cows to feed more concentrates and make full use of them after the birth, the cows should be slowly increased by 2 weeks before delivery. Feeding amount. However, the increase of fine material should not be too large every time, it can be increased by 0.5Kg every two to three days, until the total amount of concentrate before the calving reaches 5-7Kg/first day; if the cows with breast edema should control or Reduce the amount of concentrate feed. 3 Ply Surgical Mask,Disposable Medical-Surgical Mask,Coronavirus 3D Mask,Dust Masks With Filters Dust Dongguan City Risen Medical Products Co., Ltd. , https://www.risenppe.com