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What is MUN?
Most milk tests report milk urea nitrogen (MUN) levels, and these values can provide significant insight into how dairy cows are using ration protein. MUN is a natural occurrence in cows, and is caused by protein consumption. When cows ingest protein, it is either broken down in the rumen to become available to rumen microbes or escapes to be an available supply of protein and amino acids to the cow for milk production.