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% of fat, therefore, the amount of supplement is generally 3% to 4%. That is, one cow per day should be supplemented with 0.45 to 1.36 kilograms. If the amount of fat in the diet exceeds 7%, it will reduce the activity of rumen microbes, affect the digestion of crude fiber, lead to lower 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 fat percentage is 3.5%, and the fat content in one day is 1.27 kilograms, to maintain the normal body condition and the continuous production level of the cow, 1.27 kilograms of fat should be added to the diet. The effect of adding fats 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 fat in production. For example, using soybean as the only fat in the diet will cause excessive amounts of degradable protein in the rumen, affecting feed intake. Gossypol poisoning occurs when cottonseeds are fed more than 3.6 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 change the internal environment of the rumen and 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 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 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. He began to feed 1/3 first, and fed the whole amount in 3 stages. Generally it takes 3 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 the other ingredients. If this is not possible, feed as much fat and feed as possible. China Agricultural Network Editor
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