WINTER BONUS MAGAZINE 2025

There are several potential causes for high MUN levels. One is simply an excess of rumen- degradable protein. Another reason could be insufficient energy to help break down the protein. High MUN levels can also occur when too much NPN (non-protein nitrogen) is fed, which can suggest overfeeding urea. To correct high MUN levels, various feeding factors can be adjusted. It is essential to ensure that the ratio between energy and protein in the diet is balanced. Assessing the types of protein sources used in the diet may help determine the cause. Removing unnecessary additives (such as urea) at this time can also help lower MUN levels. Grass quality can present a challenge during spring, as it naturally contains higher amounts of rumen-degradable protein. In such cases, a De Heus technical advisor can suggest an If MUN levels and the overall health of your dairy cows are a concern, contact a local De Heus technical advisor who can provide tailored insights and solutions – https://www.deheus.co.za/meet-our- team/. www.deheus.co.za | 031 785 1575 | infosa@deheus.com Concluding thoughts MUN management is often overlooked, but when managed effectively, it can positively impact not only milk production, but also the overall health of a dairy cow by ensuring energy is used efficiently. diet that the cow is not fully utilising. This often occurs in spring, when the grass is lush and contains high amounts of rumen-degradable protein. While the cow can convert some of these soluble proteins into bypass proteins for milk production via microbes, it cannot convert all the rumen-degradable proteins. additive designed to convert excess rumen- degradable protein into protein available for milk production. 93 Winter 2025 BONUS