Macruse index for assessing the functional state of the heart activity of the Jersey breed cows

Purpose: to determine the values of the macruse index in the clinically healthy cows of the Jersey breed with different vegetative tones. 

Materials and methods. The characteristics of the ECG and the variability of the rhythm of the heart were learned in 103 goals of the Jersey breed. For the analysis and record of the Jersey cattle ECG, the Conan-4.5 program was used on the frontal diverting system according to the method of M. P. Roshchevsky. ECG was recorded two to three hours before eating. Clinical studies included palpation, percussion and auscultation in strict accordance with the methodology of clinical examination of animals according to B. V. The work was calculated in the work of the macrose index, it is the ratio of the duration of the tooth P to the duration of the PQ segment (the difference between the duration of the Ruz P and the PQ interval) or is the fraction of the time of the cardiopulse by atrium to the total time of the atrioventricular conduct 

Results. The obtained electrophysiological indicator of the Jersey breed cows - the macruse index in a state of relative rest, characterizes the normal functioning of cardiac activity, and when they change their pathological conditions. This indicator was 0,29-0,81, its change is associated with an increase in the time of atrioventricular conduction and the expansion of the P-Q interval as a result of this interval. On the ECG, the clinically healthy cows of the Jersey breed with the alleged initial vegetative tone of “Varoidony” the Macruse index was 0.29 ± 0.01. In this group, the parasympathetic department of the autonomic nervous system prevails. For healthy studied animals with the proposed initial vegetative tone of Normotonia, the macruse index was 0.38 ± 0.01. This group is characterized by the equilibrium state of homeostasis between CO and the autonomic nervous system. For animals with the alleged initial vegetative tone of the “sympathycotony”, the macruse index was 0,59±0,01. In this group, the vegetative balance takes place towards the sympathetic department of the autonomic nervous system. And for "hypercimpaticotonics" the macruse index was 0,81±0,01. In this group there is a “goature” of the sympathetic department of the autonomic nervous system. 

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