[Evaluation and comparison of acid-base findings obtained using the partial and Astrup's technic in cattle].

The aim of the study was to compare the acid-base (AB-) findings in cattle obtained parallelly by the equilibration method after Astrup and the partial method (titration determination of total carbon dioxide in blood plasma) and at the same time to determine pH, net acid-base exudate in urine and the specific weight of urine. Altogether we made 65 parallel examinations in three groups of cows according to phases of reproduction. In 70.8% of cases correlation between the two results was very good or good, however under the condition that in many cases it was necessary to know also blood pH for the employment of the partial method. Without the knowledge of the blood pH good correlation would be obtained only in 33.8% of all cases. The partial method does not provide satisfactory results mainly in diagnosing respiratory disturbances and in determining compensatory degree of acid-base disturbances. We analysed two alternative values for the top, reference limit of vol. % CO2 in plasma: 60.0 or 55.0. The results imply that from the aspect of correct partial method interpretation it is more accurate to use the value 60.0. A high interpretation correlation between pH and net acid-base urine exudate was also confirmed and that independent urine pH values may be used in a complex acid-base examination to obtain acid-base findings. The representation of the basic types of acid-base disturbances indicates that metabolical acidoses are most frequent in highly pregnant cows (36.9%) mostly without proved compensation. The largest proportion of normal acid-base findings (43.4%) was determined in cows after calving in which also the compensatory mechanisms were most often activated. In connection with these findings the possibilities of impaired health of calves are discussed.