Effect of dietary energy and protein level and lactation period on metabolism of cows
1993
Kadarik, K. (Estonian Agricultural Univ., Tartu (Estonia))
This investigation was carried out with Estonian Black and White and Estonian Red cattle producing on average 4500...6000 kg milk per year. The cows were fed not quite adequate to their milk production. Crude protein content varied from 12.4 to 17.7 in diet dry matter. Between the dietary energy level and protein cotent of diet was a negative correlation (r = -0.618, n=643). For high producing cows in early lactation a metabolic alkalosis was observed. This phenomenon was resulted by hypochloraemia and inhibition of liver ureagenesis. Urea synthesis was inhibited by decreasing the free essential amino acid content in the blood (Fig.3). It was caused by the low diets protein and by the intensive milk protein synthesis. Simultaneously with the inhibition of ureagenesis the SB consumption in the liver decreased. That's why the SB level of the blood increased
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