In a controlled study, it was carried out the electrocardiography of the 152 Tuckerman resting (Saka) horses comparatively for the first time in the leads I, II, III, aVR, aVL, aVF, V10, CV6LU, CV6LL, CV6RU, CV6RL and BA. The QRS complexes evaluated from point of the relative frequencies of patterns, durations, relative frequencies of Q, R and S waves, and the amplitudes of Q, R and S waves. The mean electrical axes of the QRS complexes were measured in the Frontal (Horizontal), Transverse and Left Sagittal planes using the semi orthogonal leads I and aVF; I and V10; and yb and aVF. The results were tabulated into the tables 1 to 5. In general, this study demonstrated the most similarity concerning the QRS complex between Turkmen and Thoroughbred breeds.
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