1. The dosage of urea should not exceed 1/3 of the total nitrogen requirement and not exceed 1 of the dry matter of the diet. 2. Because urea has good hygroscopicity and is easily decomposed into ammonia, it cannot be fed alone or dissolved in water. Do not drink water for 2 hours after feeding. 3. Urea has poor palatability. It is best to add it to mixed concentrates or mix it with starch feed, salt and other mineral feeds to make urea mineral feed licking bricks for cattle to lick to reduce the intake rate. 4. When urea is added to the feed, raw bean cake cannot be fed at the same time, because raw bean cake contains urease, which will accelerate the decomposition of urea in the presence of water, causing losses. 5. The total amount of urea fed daily is divided into multiple feedings, which is beneficial to stabilizing the concentration of ammonia in the rumen and avoiding waste or poisoning. Although urea is a good protein supplement feed and can provide nitrogen to cattle, it does not provide other nutrients. Therefore, when using urea to supplement protein, energy, minerals and vitamins must be supplemented at the same time. Only in this way can we get the desired effect.