[Changes in the T-wave configuration in the ECG telemetry of cows]

Radiotelemetric and biochemical investigations were carried out with a total of 40 freshly calved cows, divided into two groups in dependence on the form of the T wave of ECG. It was found that the biphase T wave spoke of the individual capacity of the body; it was retained only during the first months of the lactation period, and later on changed into a negative T wave. The configuration of the T wave was not essentially affected by the blood serum levels of total protein, blood sugar, LDH, AcAT, AlAT, Ca, P, and Mg. In the study of the alkaline-acid state dependable differences were established with the gas exchange of oxygen as measured by the indices pO2, SAT, and O2CT which were shown to be higher in cows with a biphase T wave. The registration of a positive branch of the biphase T wave was associated with the enhancement of excitation of the right chamber and the registration of its vector. In normal conditions the latter was not demonstrated by the dominating biopotentials of the left chamber.