[Radiotelemetric studies of heart rate in cows]

The use of radiotelemetric apparatuses made it possible to record the heart rhythm through registering the R peak with cows during the puerperal period. Studied were a total of 212 cows. A group of 102 of them had no complications in the puerperium and served as controls. The remaining 110 were with complications during this period, and formed two test groups (with and without the use of electrostimulation). It was found that the heart pulsation rate was highest on the day of calving (87, on an average). It gradually dropped during the following days. On the first and second day after parturition the cows of the test groups showed 3 to 7 contractions more. Highest was the rate of pulsations on the fourth day, the difference between the controls and the cows with complications (without electrostimulation) rising by 11 contractions, on an average,--and the cows with complications (with electrostimulation of the uterus) rising by 6-7 contractions.