The amount of fat should be appropriate. The fat content in the dairy cow's diet should not exceed 7% of the dry matter of the diet. The replenishment amount is generally 3 to 4%.

Calculate the amount of fat added to be accurate. The amount of fat a cow needs depends on the amount of milk fat synthesis. If a dairy cow produces 36 kilograms of fresh milk per day with a milk fat rate of 3.5%, and a day’s milk fat content of 1.27 kilograms, to maintain the normal condition and continuous production level of the cow, 1.27 kilograms of fat should be added to the diet.

Don't use only one type of fat in the production of different sources and types of fat. For example, using soybeans as the only fat in the diet can cause excessive rumen degradable protein and affect feed intake. Gossypol poisoning occurs when the cottonseed is fed more than 3.6 kg or 4.5 kg per day, which can lead to visceral bleeding and reduced reproductive function. Liquid oil is not suitable for lactating cows' feed.

Pay attention to the interaction between 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 beef and mutton oil can increase milk production. Alfalfa and cottonseed have a good synergistic effect, and alfalfa can speed up the digestion of cottonseed.

Fat feeding should be done step by step. Gradually increasing the fat feeding can avoid the problem of poor palatability. Start by feeding 1/3, and then feed it to the full amount in 3 stages. It usually takes 3 to 4 weeks. You can gradually add fat during the dry period.