The research is aimed at complementing the method of establishing the stress in calves, race heifers, fattened cattle and milch-cows with different body masses. Measuring of heart rate is one of ...painless measurements of physiological parameters of stress and, from the point of view of animals, it has many advantages over the measurements including taking of blood samples. For measuring the heart rate of different categories of cattle without interference into thier body we have tested the usefulness if special apparatures used worldwide by top sportsmen during training for following up, measuring and monitoring the heart rate. These are Polar monitors of the heartrate, made by Finlands company Polar Electro Oy and working wirelessly with ECG precision. By modifying the measuring device Polar Sport Tester a stable signal was reached at any time of measuring. The receiver of this complete counts the heart rate on the basis of pulse to pulse time average algorithms in 5, 15 or 60 sec intervals. The computer interface ensures magnetic transfer of measured and saved data on animals into the PC where the analysis of each collected data file follows.
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