THE EFFECT OF PROTEIN LEVEL AND ITS DEGRADATION ON THE NITROGEN METABOLIZM IN THE RUMEN OF THE HOLSTEIN COWS-FIRST-CALF
It is found that the concentration of NH3-N was directly depending on to the amount of protein in the diet and RDP. The concentration of urea is strongly dependent on the content of RDP in rations for cows than from the level of CP. Based on this study, the pH values of ruminal fluid for all diet variants were in the range of 6.03 - 6.16 units.