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Click here for frequently asked questions about Management MUN

Click here for Journal of Dairy Science research article on Management MUN

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Block A

This graph illustrates the percentage of cows at each unit level of Management MUN. The graph also includes a highlighted area from 10-14 milligram/deciliter. This range has been identified by researchers as the normal or desired MUN range for lactating cows.

It may not be realistic to expect all your cows to be in this desired range all of the time. Changing your ration if most of your cows are in the Desired Range and a relatively even percent of cows is both high and low is probably not warranted. However, if your group of cows is skewed with a high proportion outside of the normal MUN range, you should strongly consider adjusting the group's TMR.

MUN values below the 10 mg/dl may indicate one or more of the following factors about the ration they are eating - along with possible solutions:

  1. The protein level is low - add more rumen degradable protein
  2. Rumen fermentable non fiber carbohydrate levels are high - replace shelled corn with whole cottonseed
  3. The ration's energy level is high - remove fat or high energy feeds such as shelled corn

MUN values over 14 mg/dl may indicate one or more of the following factors about the ration they are eating - along with possible solutions:

  1. The protein level is high - reduce rumen degradable protein
  2. Rumen fermentable non fiber carbohydrate levels are low- add shelled corn
  3. The ration's energy level is low - add fat or high energy feeds such as shelled corn

Conventional MUN Reports are are Optional Reports available to AgSource members. In addition to the report charge, there is also a charge for the individual cow MUN analysis

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Block B

The desired MUN range of 10-14mg/dl is highlighted. The bar graph illustrates how first and later lactation cow's MUN averages for this ration group have reacted over the past three tests.

Your group's makeup is constantly changing with some cows leaving and others entering the group. However, you can still track the results of any ration adjustments you have made and how they have affected the group's Management MUN.

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Block C

CURRENT TEST AVERAGE DIM / MUN LEVEL

This block identifies the average days in milk of cows at each MUN level in Block A.

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Block D

This table contains the average Actual MUN (raw value) and the Average Management MUN (adjusted value) of first lactation and second and greater cows over the past three test days.

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Block E

LOW MGT. MUN COWS <10 mg/dl;
HIGH MGT. MUN COWS >14 mg/dl

This table allows you to track low and high Management MUN cows by lactation over the past three months. This enables you to track results from ration changes you have made over these periods and how the changes have affected these outlier groups. A close examination of outliers will generally provide more information than simple averages. The tables include:

  • Test Date
  • Avg. Mgt. MUN - Average Management MUN of the cows in this high or low group
  • % Total Group - Percent of the total group in the low or high MUN range.
  • Average DIM - Average days in milk for the cows in this group.

Block A provides a visual graphic illustration of your herd or group Management MUN distribution. This block quantifies the percent of cows that are outliers (<10 mg/dl or >14 mg/dl).

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