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The amount of fat fed to the appropriate dairy cow diet should not exceed 7% of dietary dry matter. Under normal circumstances, the basic dairy cow diet itself contains about 3% fat, therefore, the amount of supplement is generally 3% to 4%. If the amount of fat in the diet exceeds 7%, it will reduce the activity of rumen microbes, affect the digestion of crude fiber, cause the loss of appetite in dairy cows, reduce the intake of dry matter, and reduce milk production. When the energy requirement exceeds the amount of fat that the rumen can afford, the coated fat particles are fed. This product can be digested in the small intestine through the rumen, which can meet the energy needs of dairy cows without reducing the digestibility of crude fiber in the rumen. Calculating the amount of fat to be added to accurately determine the amount of fat the cow needs depends on the amount of milk fat synthesis. If a dairy cow produces 36 kilograms of fresh milk per day, the milk fat rate is 3.5%, and the fat content in a day is 1.27 kilograms, to maintain the cow's normal condition and continuous production level, 1.27 kilograms of fat should be added to the diet. The effect of adding fat to feeds from different sources and types of fat dairy cattle depends on the source and type of fat. Therefore, do not use only one type of fat in production. For example, the use of soybean as the only fat in the diet can cause excessive amounts of degradable protein in the rumen, affecting feed intake. Gossypol poisoning occurs when cottonseeds are fed more than 3.6 kilograms or 4.5 kilograms a day, resulting in reduced visceral bleeding and reproductive performance. Therefore, different fats should be selected based on price, availability, and dietary requirements. Also note that the physical and chemical properties of different types of fat vary widely. Liquid fats are not suitable for the feed of lactating cattle. Because they will change the rumen's internal environment, affect the digestion of cellulose. Therefore, only the maximum fermentation activity and relative stability in the rumen can be ensured, and the increase of cellulose digestion can obtain high milk yield. Pay attention to the interaction of fat and roughage When adding fat, consider the type of roughage that makes up the diet. When corn silage is used as the main forage, only the addition of cow and sheep oil can increase milk production. Wolfberry and cottonseed have a good synergy and can accelerate the digestion of cottonseed. This may be because calcium and fatty acids contained in indole form insoluble calcium soaps, making it easier for fatty acids to pass through the rumen. Gradually increasing the amount of fat fed to the fat can avoid poor palatability. We began to feed one-third of the time and feed it in three stages. It usually takes 3 weeks to 4 weeks. You can gradually add fat during the dry period. It takes 3 days for cows to adapt to fat. Compared with other feeds, cows tend to eat fat at a slower rate. It is best to add fat to the fully mixed diet and mix thoroughly with other ingredients. If this is not possible, feed as much fat and feed as possible.