It is not appropriate to add urea in autumn

Urea is an effective supplement for cattle, especially when used to enhance the protein content of low-quality feed. In the rumen, microorganisms break down urea into ammonia, which is then used to synthesize bacterial protein. This process can help reduce the need for traditional protein sources like soybean meal or fishmeal. However, it's important to note that urea supplementation is most beneficial during seasons when high-quality protein sources are limited—such as in winter and spring, when cattle are often fed with wheat straw, dry corn stalks, or hay. In contrast, feeding urea in autumn, when cows graze on grasses and mature seeds, is generally not recommended. These feeds typically contain higher levels of crude protein, ranging from 12% to 20%, which makes the use of urea less effective. When the crude protein content in the diet is already high, the efficiency of urea utilization by rumen microbes drops significantly. Studies show that when the crude protein level is below 11%, urea can improve weight gain by up to 39%. But as the protein content increases, the benefits of adding urea diminish. Once the crude protein exceeds 12%, urea may even lead to reduced weight gain or negative effects on the animal’s health. Using urea in high-protein diets not only fails to deliver the expected results but can also be harmful. It may cause digestive issues, reduce feed intake, and ultimately increase feeding costs without any real benefit. Therefore, farmers should carefully evaluate the protein content of their feed before deciding to add urea. Proper management and timing are key to maximizing the benefits of this supplement while avoiding potential risks.

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