Milk urea nitrogen is a parameter used to monitor the protein nutritional status of dairy cows. Milk urea nitrogen refers to the amount of urea found in milk, and this value is closely related to the concentration of urea in the blood. In fact, the milk urea nitrogen value is not meaningful on its own. This value is used together with milk production records, feed management practices and evaluation of dry matter, rumen degradable protein, rumen non-degradable protein, nonstructural carbohydrates and water intake.
When cows are fed, microbes in the rumen reduce the protein to ammonia. Microbes use ammonia and fermentable carbohydrates to make amino acids and microbial protein. These are then reduced to amino acids and absorbed by the cow in the small intestine. Excess ammonia is absorbed through the rumen wall and is converted to urea and passes to the liver. Urea can either be returned to the rumen via saliva or excreted in the urine.
The amount and rate of carbohydrate digestion in the rumen is regulated by microbial protein synthesis. To capture ammonia, bacteria need an energy source, fermentable carbohydrates. Fats in feed are not used by bacteria as an energy source. Therefore, adequate amounts of fermentable carbohydrates must be provided for optimum rumen function and microbial protein synthesis.
Cows spend a lot of energy to excrete excess urea through urine. Excessive urea concentrations in the blood have deleterious effects on milk production, reproductive efficiency, embryo survival and immune function.
Factors affecting milk urea nitrogen concentration include:
In short, the average value of milk urea nitrogen is effectively used by producers to identify when deficiencies in protein or energy supply occur at the rumen level. When evaluating a feeding program, the protein fractions and the amount of non-structural carbohydrates provided in a balanced ration are primarily assessed.
Our organization also provides milk urea nitrogen analysis services with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors.
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