Influence of the season on the mass fraction of protein and urea in the milk of cows of black and motley breeds with different methods of maintenance and milking technologies

The article presents the results of studies on the urea content and the mass fraction of protein in the milk of cows with a tethered and loose method of maintenance, taking into account the technology of milking cows, depending on the season. The optimum content of urea, protein in cow's milk is established in summer period, the greatest one is revealed in winter period with all milking methods and maintenance technologies