The nutritional needs of pregnant cows are directly related to fetal growth. The fetal weight gain is mainly in the last trimester of pregnancy. At this time, the weight gain accounts for 70%-80% of the calf's primary weight and it needs to absorb large amounts of nutrients from the mother. If the fetal growth during embryonic development is poor, it is difficult to compensate after birth, the rate of weight gain slows down, and raising costs increase. At the same time, the cow needs to accumulate certain nutrients in order to ensure the postpartum lactation. During the first 6 months of pregnancy, the embryo develops slowly. It is not necessary to increase nutrition for the cows. For beef cattle that are mainly grazing, grassing season should be extended as long as possible, and feeding is generally not possible. During the subtilis season, the type and amount of supplemental forage materials are determined according to the quality of pasture and the nutritional needs of the cattle, especially during the last 2-3 months of pregnancy. In the event of a subtilis season, important supplementary feeding should be carried out, especially to supplement carotene. And vitamin A, in addition to supplement energy feed, protein and mineral needs. In the case of forage feeding, the principle of using green roughage as the main ingredient is appropriately matched with the fine material. The coarse material is corn straw, the quality leguminous pasture, and the additional pancake is added. The crude material is supplemented by 1 kg, of which 270 g of corn is used. 250 grams, 200 grams of cake, 250 grams of rice, 10-20 grams of stone powder, 10 grams of salt. Pregnant cows are forbidden to feed cotton cakes, vegetable cakes, and sprinkles. Do not feed frozen, moldy feeds. Use the coarse, fine, and fine feeding method to feed the raw material first. After the cow is half full, feed the concentrate and the juicy feed. Late pregnancy should do a good job of fetal protection, regardless of grazing and feeding, should prevent extrusion, sprint. Pay attention to observation before delivery and ensure safe delivery. When feed conditions are good, excessive fat and lack of exercise should be avoided. Adequate exercise can enhance the body of the cow, promote the growth and development of the fetus, and prevent dystocia. Difficulty in the production of purebred meat is higher, especially in the first born cows, and midwifery must be done.
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