Validation of models for predicting milk urea nitrogen concentrations

Relationship among Concentrations of Milk Urea Nitrogen and Plasma Urea Nitrogen and Feeding Time

Eight Holstein cows were used to determine the relationship among milk urea nitrogen (MUN), plasma urea nitrogen (PUN), and feeding time. We first established that MUN concentrations were similar in concentration among quarters by comparing milk samples from each quarter just before milking. In order to determine if collecting a sample of milk from a quarter influenced the MUN in samples taken ...

Milk Urea Nitrogen Testing

Application of Milk Urea Nitrogen Values

In dairy cows, dietary crude protein (CP) that can is not captured as milk protein is largely excreted as N in manure. Of course, some protein-N is retained for growth in first and second lactation animals and in the calf and fetal tissues during pregnancy; however, these amounts are small relative to the proportion of absorbed N going into milk. Cows and other mammals convert N from absorbed a...

Evaluation of models to estimate urinary nitrogen and expected milk urea nitrogen.

Milk urea nitrogen (MUN) has been introduced as a means to estimate urinary nitrogen (N) excretion and protein status of dairy cattle. For Holstein cows, the amount of urinary N excreted (g/d) was originally reported to be 12.54 x MUN (mg/dl), but recently urinary N (g/d) was reported to equal 17.64 x MUN (mg/dl). The objectives of the present study were to evaluate models to predict urinary N ...

Milk Urea Nitrogen - A Nutritional Evaluation Tool?

protein nutritional status of dairy cows. Milk urea nitrogen reflects the amount of urea found in milk and these values are closely correlated with the concentration of urea found in the blood. MUN values should not be used by themselves when evaluation a herd’s feeding program but can be used in conjunction with evaluating milk production records, feeding management practices, and dry matter, ...