However, within each production group, those cows with lower MUN level were twice as likely to become pregnant than those with high MUN levels. Even though high MUN levels are associated with decreased fertility, producers shouldn't strive for low MUN levels as a way to improve reproduction. Low MUN levels often indicate a deficiency in dietary protein which can lead to lower milk production. Milk urea nitrogen levels should always be interpreted in association with the overall management of the herd and be within the 10-14 milligrams per deciliter target range. AgSource makes MUN analysis available through its Menomonie and Stratford laboratories.
Analysis is convenient since it can be completed using the same sample taken for component analysis.
You can elect to test for MUN on all cows, specific groups, or only part of your herd. MUN results are returned automatically as part of your DHI management reports on the Sample Day and Lactation Report, a cow MUN report or in electronic files. The MUN Summary also provides valuable herd level analysis of MUN results. The World's Forage Analysis Superbowl takes place each year at World Dairy Expo and now is the time to request an entry form. Entry deadlines must be received by September 7, 2001.