Effect of nitrogen metabolism on acid-base balance
1996
Kadarik, K. (Estonian Agricultural Univ., Tartu (Estonia). Inst. of Morphology)
When non-lactating and non-pregnant cows were fed with rations energetically corresponding to maintenance requirements, feed dry matter protein and crude fibre content variations were accompanied by changes in acid-base status. When rations with shortage of dry matter protein and crude fibre were given on the basis of urine indicators' changes in acid-base status, acidosis shift occurred. In urine pH, BAR and NABE were low and NH4- content high. In case of rations with excess protein and crude fibre the above-mentioned changes were opposite in urine and in acidbase status alkalosis shift occurred. High protein content in diets increased urea concentration in blood and urine, and amount of urea eliminated during 12 h period was arisen. Greater urea excretion was accompanied by more intensive bases elimination, which helped to preserve acid-base balance. Increased PCO2 in blood was - normalised by higher urine excretion rates of urea and bases
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