1. The digestible total nutrients in the feed during the lactation period are high and should contain enough crude fiber. The feed preferably includes seed or animal fats with high oil content such as cottonseeds, soybeans and the like. During this period, the nutritional level of the dairy cow diet should be 2.4 NND per kg of dry matter. Crude protein accounted for 16%-18% of dietary dry matter, 0.7% calcium, and 0.45% phosphorus. The crude ratio was controlled as much as 46-50:50-54. In order to avoid a drop in butterfat ratio, crude fiber should not be less than 17% (accounting for dry matter in the diet). According to the American NRC feeding standards, the crude protein content in the early stage of lactation can be increased to 19%. At the same time, the ratio of rumen protein should be increased, and protein feeds or additives with high levels of methionine, lysine and threonine should be fed. The milk cow feed consisting of 600 kilograms of milk with a daily output of 40 kilograms is composed of 12 kilograms of concentrate, 25 kilograms of silage, 4 kilograms of hay, and 5 kilograms of juicy feed. It has been determined that high-yielding dairy cows eat enough feed, and they have to eat at least 8 hours per day. At present, in the case of milking three times a day, the intake time of dairy cows is generally not enough, and the milking period of dairy cows should extend the feeding time and increase the number of feedings. 2. During the middle period of lactation, the milk production of cows began to gradually decline, and the decline rate was generally 6%-8%. At the same time, after the pregnancy of the cow, the nutritional needs of the cow have been reduced. This feature should be seized so that it can eat more hay and supplement the concentrate properly so that the milk production and fat percentage can be maintained at a relatively high level. The crude/raw ratio of the mid lactation diet can be controlled at 40-45:55-60. 3. During the late lactation period, the milk production of cows has dropped significantly, and it is easier to raise at this time. This stage should be used to intensify the recovery of dairy cows. There is still potential for milk production during this period, so cows cannot be overgrown.
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