The feeding stage of dairy cows can be divided into four stages: initial lactation (70 days after childbirth), mid lactation (71 days to 140 days after childbirth), late lactation (141 days to 305 days after childbirth), and dry milk (306 days after childbirth). 363 days). Among them, 30 days before delivery (the second dry month) and 70 days after delivery (early lactation) are the most critical 100 days for the management of dairy cows. The management of these 100 days should pay attention to the following aspects: Control of perinatal diseases The occurrence of: 1, ketosis: can cause overall energy metabolism disorders. Postpartum sputum: Hypocalcemia is the main cause of postpartum spasticity in dairy cows. 3, no less than the birth clothing: the occurrence of malnutrition in cattle, pregnant cattle feed should pay attention to the supply of vitamins and minerals, while paying attention to the appropriate exercise during the late pregnancy. 4, abomasum shift: due to the stress of delivery to reduce the blood calcium concentration, decreased muscle tension caused by the fourth gastric shift. Postpartum sputum is also a cause of inflammation, uterine inflammation, mastitis caused by gestosis can also cause abomasum shift. Ensure rational distribution of feed and nutrients 1. 30 days before delivery: Strictly control the amount of concentrate feed to prevent over-nutrition in dry-milk period and obesity; apply sugar calcium to elderly frail and diseased cows 2 weeks before delivery Therapy, intramuscular injection of vitamin d3, progesterone, etc., to prevent the occurrence of milk fever, retention of placenta, and ketosis. 2. 70 days after delivery: Strict feeding techniques to ensure a reasonable ratio of feed and nutrients, maintain the rumen's normal environment and digestive function, prevent pro-gastric relaxation and decreased milk fat percentage: pay attention to the amount of silage fed to prevent overfeeding Other nutrients.