The aim of the present study was to examine the effects of amount of feeding concentrate to heart rate (HR) alteration in milking parlor of Holstein dairy cows (n = 27). Heart rate was used as a ...stress indicator during milking. A total of 162 heart rate measuring were performed by the use of the modified heart rate measuring device �Polar Sport Tester � Profi� with transmitter and elastic belt with movable holder and with intermediate unit for connection to computer �Polar Interface�. On the beginning of the milking (the first 5 s), the HR increased on 89 beats per min in cows receiving only 1 kg of concentrate (89 beats per min) and the lowest HR was noticed in the cows offered 5 kg of concentrate (79.67 beats per min). After 450 s of milking the HR increased on 91.50 and 110.00 beats per min only in cows with high rate of concentrate consumption (4 and 5 kg) and reached 117 to 133% of the value during first 350 s of milking. The lowest average HR during milking was obtained by the cows which consumed 3 kg of concentrate per milking (80.25 beats per min). The relationships between heart rate and the amount of concentrate received are important for future development technologies in husbandry systems for dairy cows. Feeding daily amounts of concentrate in milking parlour is regarding to HR a potential stressful factor for high productive cows.
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