About «true » protein and urea levels in milk

Urea and true protein contents in milk were determined in the raw cow milk produced at two agricultural enterprises in Vologda region in the period from the July 2015 to the August 2016. The enterprises had different breeds of the animals and used different methods of animals keeping. The average milk yield per cow was about 6000 kg per year. The systematized average monthly and annual levels of urea, urea nitrogen and «urea protein» in cow milk were received for the first time. No important effects of cattle breeds and mode of management of the herd on the urea levels in milk were observed. Average urea contents (30-35 mg%) increased during some months up to 40mg% and normally decreased in May to 20 mg% and lower. The average content of urea protein was 0,084 %. This value should be used to calculate true protein in milk. Considerable variability of urea levels in the milks of individual cows during the whole year round was found.

true protein, non-protein nitrogen, urea, urea nitrogen, urea protein, to tether cattle