Replacement of protein feed in cattle diets with appropriate amounts of urea can reduce production costs and increase production efficiency. Use urea should pay attention to: 1 Urea does not apply to calves within 3 months of age. 2 The amount of urea should not exceed 1% of the dry matter of the diet, that is, 20-30 grams per 100 kilograms of body weight. 3 Uniformly mix urea with concentrate feed and avoid uneven mixing. Individual cattle may eat too much and become poisoned. 4 When feeding urea-containing feed, gradually increase the amount of urea fed, at least after 10 days of acclimation, before adding to the designed amount of feed. Urea can not be concentrated on a large number of feeding, it should be evenly fed several times. 5 When feeding urea, there should be suitable corn, bran and other starch-containing substances in the diet, supplemented with cobalt, sulfur and sodium and other additive products. But do not use raw soybean cake, raw beans and urea together.