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2018, № 75

UDC: 636.234.1.034.085.25:591.13
GSNTI: 68.39.15, 68.39.29

The influence of the level and degradability of protein in the rumen on nitrogen metabolism and milk productivity of Holstein cows in early lactation

The objective of this experiment was to determine the possibility of reducing the need for crude protein (CP) depending on the ratio of the rumen-undegradable protein (RUP) and rumen-degradable protein (RDP). The experiments were carried out on four Holstein first-calf cows in 42±8 d in early lactation. Cows were equipped with rumen cannulas (d=5 cm), the experiment was carried out according to the scheme of the Latin square 4½4. Rations: 1st-15.7% CP, RUP:RDP = 7.6:8.1% DM, 50:50% CP; 2nd - 15.7% CP, RUP:RDP = 5.4:10.3% DM, 35:65% CP; 3rd-17.7% CP, RUP:RDP = 9.1:8.7% DM, 50:50% CP; 4th - 17.7% CP, RUP:RDP = 6.3:11.4% DM, 35:65% CP. In the experiment there were 4 periods of 22 days each: 12 days-adaptation to a new diet, 10 days - collection period.There is a significant reduction in feed consumption and milk yield (p<0.005) in cows on a diet with a reduced 15.7% CP and a content of 6.7% RDP (RUP:RDP = 43:57% CP). There was a tendency to reduce feed consumption and milk yield in cows on a diet of 17.7% CP, the content of RDP = 11.4% DM (RUP: RDP = 35:65% CP). On a diet with a level of CP 15,7%, but a higher amount of RDP 10,3% DM, feed intake and average daily milk yield (38,7 kg/day), the efficiency of nitrogen use in the biosynthesis of milk protein was at a high level. The maximum milk yield of 39.4 kg / d was observed in cows on a diet with 17.7% CP, the content of RDP 8.7 % DM (RUP:RDP = 50:50). The ratio of protein fractions did not have a significant effect on the protein concentration in milk within the 2nd and 4th diets. There is a linear relationship between the concentration of total VFA, acetate in the rumen and the content of RDP in the diet. The efficiency of conversion of N into milk protein decreased with increasing CP level in diets. Digestibility of feed increased with increasing levels of RDP. The urea concentration was linearly related to the amount of RDP in the diets. The ratio of protein fractions and the amount of protein in the diet did not have a noticeable effect on the pH of the rumen fluid. Conclusion: in 15.7% CP the optimum content RDP = 10.3% of the DM at a ratio RUP:RDP = 35:65 % CP, in 17.7% CP is sufficient 8.7% of the RDP at a ratio RUP:RDP = 50:50.
Keywords: Cows, milk production, digestibility, amino acids, rumen, nitrogen balance
DOI: 10.21515/1999-1703-75-154-166

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Authors:

1. Ryadchikov Victor Georgievich, Professor VAK, head. Department, DSc in Biology, Professor; Physiology and feeding of agricultural animals, Federal State Budgetary Educational Institution of Higher Education “I.T. Trubilin Kuban State Agrarian University”.
2. Tantawi Abuelkasim, Postgraduate; Physiology and feeding of agricultural animals, Federal State Budgetary Educational Institution of Higher Education “I.T. Trubilin Kuban State Agrarian University”.
3. Komarova Nina Sergeevna, Postgraduate; Physiology and feeding of agricultural animals, Federal State Budgetary Educational Institution of Higher Education “I.T. Trubilin Kuban State Agrarian University”.
4. Shlyakhova Oksana Germanovna, Phd in Biology, associate; Physiology and feeding of agricultural animals, Federal State Budgetary Educational Institution of Higher Education “I.T. Trubilin Kuban State Agrarian University”.
5. Dmitrienko Stanislav Nikolaevich, Phd in Biology, associate Professor; Physiology and feeding of agricultural animals, Federal State Budgetary Educational Institution of Higher Education “I.T. Trubilin Kuban State Agrarian University”.