Titratable acidity of milk with respect to the metabolic profile of dairy cows
1991
Travnicek, J. | Kroupova, V. | Rohlik, V. (Jihoceska Univ., Ceske Budejovice (CSFR). Zemedelska Fakulta)
The objective of the present paper was to verify how titratable acidity of milk (TK) is influenced by the acid-base state of dairy cow organisms. Thirteen high-performance herds were investigated on farms in the South Bohemian region in practical farming conditions. The changes in the pH value of blood and acid-base excretion of urine within the physiological range were not reflected in titratable acidity. But if the base excretion increased above 250 mmol/l, there was a trend of titratable acidity decrease to the average value of 6.3+-0.6x2.5 mmol/l and of acid excretion increase to 7.8+-0.3x2.5 mmol/l. A decrease in the pH value of blood below 7.3 was related to a titratable acidity increase to 7.2x2.5 mmol/l, and on the other hand, an increase in the pH value of blood above 7.4 lead to a titratable acidity decrease to 6.4x2.5 mmol/l. A titratable acidity decrease below 6.2x2.5 mmol/l was influenced to the greatest extent by a decrease in the content of milk protein and by an increase in urea in milk. In the practical farming conditions the titratable acidity of milk, which is a result of polyfactorial effects, cannot be used for determination of the acid-base state of organisms.
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